[{"publisher":"AIP Publishing","external_id":{"pmid":["36182399"],"isi":["000861009600005"],"arxiv":["2206.01531"]},"arxiv":1,"citation":{"ieee":"G. H. Choueiri, B. Suri, J. Merrin, M. Serbyn, B. Hof, and N. B. Budanur, “Crises and chaotic scattering in hydrodynamic pilot-wave experiments,” <i>Chaos: An Interdisciplinary Journal of Nonlinear Science</i>, vol. 32, no. 9. AIP Publishing, 2022.","mla":"Choueiri, George H., et al. “Crises and Chaotic Scattering in Hydrodynamic Pilot-Wave Experiments.” <i>Chaos: An Interdisciplinary Journal of Nonlinear Science</i>, vol. 32, no. 9, 093138, AIP Publishing, 2022, doi:<a href=\"https://doi.org/10.1063/5.0102904\">10.1063/5.0102904</a>.","ista":"Choueiri GH, Suri B, Merrin J, Serbyn M, Hof B, Budanur NB. 2022. Crises and chaotic scattering in hydrodynamic pilot-wave experiments. Chaos: An Interdisciplinary Journal of Nonlinear Science. 32(9), 093138.","ama":"Choueiri GH, Suri B, Merrin J, Serbyn M, Hof B, Budanur NB. Crises and chaotic scattering in hydrodynamic pilot-wave experiments. <i>Chaos: An Interdisciplinary Journal of Nonlinear Science</i>. 2022;32(9). doi:<a href=\"https://doi.org/10.1063/5.0102904\">10.1063/5.0102904</a>","short":"G.H. Choueiri, B. Suri, J. Merrin, M. Serbyn, B. Hof, N.B. Budanur, Chaos: An Interdisciplinary Journal of Nonlinear Science 32 (2022).","apa":"Choueiri, G. H., Suri, B., Merrin, J., Serbyn, M., Hof, B., &#38; Budanur, N. B. (2022). Crises and chaotic scattering in hydrodynamic pilot-wave experiments. <i>Chaos: An Interdisciplinary Journal of Nonlinear Science</i>. AIP Publishing. <a href=\"https://doi.org/10.1063/5.0102904\">https://doi.org/10.1063/5.0102904</a>","chicago":"Choueiri, George H, Balachandra Suri, Jack Merrin, Maksym Serbyn, Björn Hof, and Nazmi B Budanur. “Crises and Chaotic Scattering in Hydrodynamic Pilot-Wave Experiments.” <i>Chaos: An Interdisciplinary Journal of Nonlinear Science</i>. AIP Publishing, 2022. <a href=\"https://doi.org/10.1063/5.0102904\">https://doi.org/10.1063/5.0102904</a>."},"department":[{"_id":"MaSe"},{"_id":"BjHo"},{"_id":"NanoFab"}],"_id":"12259","oa_version":"Published Version","oa":1,"volume":32,"file_date_updated":"2023-01-30T09:41:12Z","type":"journal_article","publication_status":"published","author":[{"last_name":"Choueiri","full_name":"Choueiri, George H","id":"448BD5BC-F248-11E8-B48F-1D18A9856A87","first_name":"George H"},{"first_name":"Balachandra","id":"47A5E706-F248-11E8-B48F-1D18A9856A87","full_name":"Suri, Balachandra","last_name":"Suri"},{"last_name":"Merrin","orcid":"0000-0001-5145-4609","full_name":"Merrin, Jack","first_name":"Jack","id":"4515C308-F248-11E8-B48F-1D18A9856A87"},{"last_name":"Serbyn","full_name":"Serbyn, Maksym","orcid":"0000-0002-2399-5827","first_name":"Maksym","id":"47809E7E-F248-11E8-B48F-1D18A9856A87"},{"last_name":"Hof","full_name":"Hof, Björn","orcid":"0000-0003-2057-2754","first_name":"Björn","id":"3A374330-F248-11E8-B48F-1D18A9856A87"},{"last_name":"Budanur","id":"3EA1010E-F248-11E8-B48F-1D18A9856A87","first_name":"Nazmi B","full_name":"Budanur, Nazmi B","orcid":"0000-0003-0423-5010"}],"quality_controlled":"1","article_processing_charge":"No","pmid":1,"article_number":"093138","has_accepted_license":"1","issue":"9","acknowledgement":"This work was partially funded by the Institute of Science and Technology Austria Interdisciplinary Project Committee Grant “Pilot-Wave Hydrodynamics: Chaos and Quantum Analogies.”","status":"public","intvolume":"        32","doi":"10.1063/5.0102904","isi":1,"publication_identifier":{"eissn":["1089-7682"],"issn":["1054-1500"]},"abstract":[{"lang":"eng","text":"Theoretical foundations of chaos have been predominantly laid out for finite-dimensional dynamical systems, such as the three-body problem in classical mechanics and the Lorenz model in dissipative systems. In contrast, many real-world chaotic phenomena, e.g., weather, arise in systems with many (formally infinite) degrees of freedom, which limits direct quantitative analysis of such systems using chaos theory. In the present work, we demonstrate that the hydrodynamic pilot-wave systems offer a bridge between low- and high-dimensional chaotic phenomena by allowing for a systematic study of how the former connects to the latter. Specifically, we present experimental results, which show the formation of low-dimensional chaotic attractors upon destabilization of regular dynamics and a final transition to high-dimensional chaos via the merging of distinct chaotic regions through a crisis bifurcation. Moreover, we show that the post-crisis dynamics of the system can be rationalized as consecutive scatterings from the nonattracting chaotic sets with lifetimes following exponential distributions. "}],"file":[{"file_size":3209644,"relation":"main_file","date_updated":"2023-01-30T09:41:12Z","date_created":"2023-01-30T09:41:12Z","access_level":"open_access","file_name":"2022_Chaos_Choueiri.pdf","checksum":"17881eff8b21969359a2dd64620120ba","creator":"dernst","content_type":"application/pdf","file_id":"12445","success":1}],"language":[{"iso":"eng"}],"tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","short":"CC BY (4.0)","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"},"keyword":["Applied Mathematics","General Physics and Astronomy","Mathematical Physics","Statistical and Nonlinear Physics"],"month":"09","date_published":"2022-09-26T00:00:00Z","date_created":"2023-01-16T09:58:16Z","publication":"Chaos: An Interdisciplinary Journal of Nonlinear Science","date_updated":"2025-06-11T13:41:34Z","ddc":["530"],"day":"26","title":"Crises and chaotic scattering in hydrodynamic pilot-wave experiments","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","article_type":"original","year":"2022","scopus_import":"1"},{"keyword":["Fluid Flow and Transfer Processes","Modeling and Simulation","Computational Mechanics"],"main_file_link":[{"open_access":"1","url":" https://doi.org/10.48550/arXiv.2205.12871"}],"abstract":[{"lang":"eng","text":"We report frictional drag reduction and a complete flow relaminarization of elastic turbulence (ET) at vanishing inertia in a viscoelastic channel flow past an obstacle. We show that the intensity of the observed elastic waves and wall-normal vorticity correlate well with the measured drag above the onset of ET. Moreover, we find that the elastic wave frequency grows with the Weissenberg number, and at sufficiently high frequency it causes a decay of the elastic waves, resulting in ET attenuation and drag reduction. Thus, this allows us to substantiate a physical mechanism, involving the interaction of elastic waves with wall-normal vorticity fluctuations, leading to the drag reduction and relaminarization phenomena at low Reynolds number."}],"publication_identifier":{"issn":["2469-990X"]},"language":[{"iso":"eng"}],"corr_author":"1","title":"Relaminarization of elastic turbulence","day":"03","article_type":"original","year":"2022","scopus_import":"1","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","date_published":"2022-08-03T00:00:00Z","month":"08","date_created":"2023-01-16T10:02:40Z","date_updated":"2024-10-09T21:03:55Z","publication":"Physical Review Fluids","department":[{"_id":"BjHo"}],"citation":{"apa":"Kumar, M. V., Varshney, A., Li, D., &#38; Steinberg, V. (2022). Relaminarization of elastic turbulence. <i>Physical Review Fluids</i>. American Physical Society. <a href=\"https://doi.org/10.1103/physrevfluids.7.l081301\">https://doi.org/10.1103/physrevfluids.7.l081301</a>","short":"M.V. Kumar, A. Varshney, D. Li, V. Steinberg, Physical Review Fluids 7 (2022).","ama":"Kumar MV, Varshney A, Li D, Steinberg V. Relaminarization of elastic turbulence. <i>Physical Review Fluids</i>. 2022;7(8). doi:<a href=\"https://doi.org/10.1103/physrevfluids.7.l081301\">10.1103/physrevfluids.7.l081301</a>","chicago":"Kumar, M. Vijay, Atul Varshney, Dongyang Li, and Victor Steinberg. “Relaminarization of Elastic Turbulence.” <i>Physical Review Fluids</i>. American Physical Society, 2022. <a href=\"https://doi.org/10.1103/physrevfluids.7.l081301\">https://doi.org/10.1103/physrevfluids.7.l081301</a>.","ieee":"M. V. Kumar, A. Varshney, D. Li, and V. Steinberg, “Relaminarization of elastic turbulence,” <i>Physical Review Fluids</i>, vol. 7, no. 8. American Physical Society, 2022.","ista":"Kumar MV, Varshney A, Li D, Steinberg V. 2022. Relaminarization of elastic turbulence. Physical Review Fluids. 7(8), L081301.","mla":"Kumar, M. Vijay, et al. “Relaminarization of Elastic Turbulence.” <i>Physical Review Fluids</i>, vol. 7, no. 8, L081301, American Physical Society, 2022, doi:<a href=\"https://doi.org/10.1103/physrevfluids.7.l081301\">10.1103/physrevfluids.7.l081301</a>."},"volume":7,"_id":"12279","oa":1,"oa_version":"Preprint","publisher":"American Physical Society","external_id":{"isi":["000836397000001"],"arxiv":["2205.12871"]},"arxiv":1,"issue":"8","acknowledgement":"We thank G. Falkovich for discussion and Guy Han for technical support. We are grateful to N. Jha for his help in µPIV measurements. This work is partially supported by the grants from\r\nIsrael Science Foundation (ISF; grant #882/15 and grant #784/19) and Binational USA-Israel Foundation (BSF;grant #2016145). ","status":"public","isi":1,"intvolume":"         7","doi":"10.1103/physrevfluids.7.l081301","author":[{"full_name":"Kumar, M. Vijay","first_name":"M. Vijay","last_name":"Kumar"},{"last_name":"Varshney","first_name":"Atul","id":"2A2006B2-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-3072-5999","full_name":"Varshney, Atul"},{"first_name":"Dongyang","full_name":"Li, Dongyang","last_name":"Li"},{"last_name":"Steinberg","full_name":"Steinberg, Victor","first_name":"Victor"}],"publication_status":"published","type":"journal_article","article_number":"L081301","article_processing_charge":"No","quality_controlled":"1"},{"language":[{"iso":"eng"}],"corr_author":"1","main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/2111.14894"}],"abstract":[{"lang":"eng","text":"Directed percolation (DP) has recently emerged as a possible solution to the century old puzzle surrounding the transition to turbulence. Multiple model studies reported DP exponents, however, experimental evidence is limited since the largest possible observation times are orders of magnitude shorter than the flows’ characteristic timescales. An exception is cylindrical Couette flow where the limit is not temporal, but rather the realizable system size. We present experiments in a Couette setup of unprecedented azimuthal and axial aspect ratios. Approaching the critical point to within less than 0.1% we determine five critical exponents, all of which are in excellent agreement with the 2+1D DP universality class. The complex dynamics encountered at \r\nthe onset of turbulence can hence be fully rationalized within the framework of statistical mechanics."}],"publication_identifier":{"issn":["0031-9007"],"eissn":["1079-7114"]},"year":"2022","article_type":"original","scopus_import":"1","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","title":"Phase transition to turbulence in spatially extended shear flows","day":"05","date_updated":"2024-10-22T11:08:41Z","publication":"Physical Review Letters","date_created":"2022-01-23T23:01:28Z","date_published":"2022-01-05T00:00:00Z","month":"01","ec_funded":1,"volume":128,"oa":1,"_id":"10654","oa_version":"Preprint","project":[{"name":"ISTplus - Postdoctoral Fellowships","call_identifier":"H2020","grant_number":"754411","_id":"260C2330-B435-11E9-9278-68D0E5697425"},{"name":"Decoding the complexity of turbulence at its origin","call_identifier":"FP7","_id":"25152F3A-B435-11E9-9278-68D0E5697425","grant_number":"306589"},{"grant_number":"662960","_id":"238598C6-32DE-11EA-91FC-C7463DDC885E","name":"Revisiting the Turbulence Problem Using Statistical Mechanics"}],"citation":{"ista":"Klotz L, Lemoult GM, Avila K, Hof B. 2022. Phase transition to turbulence in spatially extended shear flows. Physical Review Letters. 128(1), 014502.","mla":"Klotz, Lukasz, et al. “Phase Transition to Turbulence in Spatially Extended Shear Flows.” <i>Physical Review Letters</i>, vol. 128, no. 1, 014502, American Physical Society, 2022, doi:<a href=\"https://doi.org/10.1103/PhysRevLett.128.014502\">10.1103/PhysRevLett.128.014502</a>.","ieee":"L. Klotz, G. M. Lemoult, K. Avila, and B. Hof, “Phase transition to turbulence in spatially extended shear flows,” <i>Physical Review Letters</i>, vol. 128, no. 1. American Physical Society, 2022.","chicago":"Klotz, Lukasz, Grégoire M Lemoult, Kerstin Avila, and Björn Hof. “Phase Transition to Turbulence in Spatially Extended Shear Flows.” <i>Physical Review Letters</i>. American Physical Society, 2022. <a href=\"https://doi.org/10.1103/PhysRevLett.128.014502\">https://doi.org/10.1103/PhysRevLett.128.014502</a>.","short":"L. Klotz, G.M. Lemoult, K. Avila, B. Hof, Physical Review Letters 128 (2022).","apa":"Klotz, L., Lemoult, G. M., Avila, K., &#38; Hof, B. (2022). Phase transition to turbulence in spatially extended shear flows. <i>Physical Review Letters</i>. American Physical Society. <a href=\"https://doi.org/10.1103/PhysRevLett.128.014502\">https://doi.org/10.1103/PhysRevLett.128.014502</a>","ama":"Klotz L, Lemoult GM, Avila K, Hof B. Phase transition to turbulence in spatially extended shear flows. <i>Physical Review Letters</i>. 2022;128(1). doi:<a href=\"https://doi.org/10.1103/PhysRevLett.128.014502\">10.1103/PhysRevLett.128.014502</a>"},"department":[{"_id":"BjHo"}],"arxiv":1,"external_id":{"pmid":["35061458"],"isi":["000748271700010"],"arxiv":["2111.14894"]},"publisher":"American Physical Society","acknowledged_ssus":[{"_id":"M-Shop"}],"isi":1,"doi":"10.1103/PhysRevLett.128.014502","intvolume":"       128","issue":"1","acknowledgement":"We thank T.Menner, T.Asenov, P. Maier and the Miba machine shop of IST Austria for their valuable support in all technical aspects. We thank Marc Avila for comments on the manuscript. This work was supported by a grant from the Simons Foundation (662960, B.H.). We acknowledge the European Research Council under the European Union’s Seventh Framework Programme (FP/2007-2013)/ERC Grant Agreement 306589 for financial support. K.A.\r\nacknowledges funding from the Central Research Development Fund of the University of Bremen, grant number ZF04B /2019/FB04 Avila Kerstin (”Independent Project for Postdocs”). L.K. was supported by the European Union’s Horizon 2020 Research and innovation programme under the Marie Sklodowska-Curie grant agreement  No. 754411.\r\n","status":"public","article_number":"014502","pmid":1,"quality_controlled":"1","article_processing_charge":"No","author":[{"full_name":"Klotz, Lukasz","orcid":"0000-0003-1740-7635","first_name":"Lukasz","id":"2C9AF1C2-F248-11E8-B48F-1D18A9856A87","last_name":"Klotz"},{"full_name":"Lemoult, Grégoire M","id":"4787FE80-F248-11E8-B48F-1D18A9856A87","first_name":"Grégoire M","last_name":"Lemoult"},{"last_name":"Avila","first_name":"Kerstin","full_name":"Avila, Kerstin"},{"last_name":"Hof","first_name":"Björn","id":"3A374330-F248-11E8-B48F-1D18A9856A87","full_name":"Hof, Björn","orcid":"0000-0003-2057-2754"}],"publication_status":"published","type":"journal_article"},{"quality_controlled":"1","article_processing_charge":"No","author":[{"first_name":"Jianxin","full_name":"Liu, Jianxin","last_name":"Liu"},{"orcid":"0000-0001-7173-4923","full_name":"Marensi, Elena","id":"0BE7553A-1004-11EA-B805-18983DDC885E","first_name":"Elena","last_name":"Marensi"},{"last_name":"Wu","full_name":"Wu, Xuesong","first_name":"Xuesong"}],"publication_status":"published","type":"conference","isi":1,"doi":"10.1007/978-3-030-67902-6_51","intvolume":"        38","acknowledgement":"The work is supported by the National Key Research and Development Program of China (No. 2016YFA0401200), the National Natural Science Foundation of China (Grant Nos. 91952202 and 11402167).","status":"public","external_id":{"isi":["000709087600051"]},"publisher":"Springer Nature","volume":38,"_id":"10820","oa_version":"None","conference":{"end_date":"2019-09-06","start_date":"2019-09-02","location":"London, United Kingdom","name":"IUTAM Symposium"},"department":[{"_id":"BjHo"}],"citation":{"ieee":"J. Liu, E. Marensi, and X. Wu, “Effects of streaky structures on the instability of supersonic boundary layers,” in <i>IUTAM Laminar-Turbulent Transition</i>, London, United Kingdom, 2022, vol. 38, pp. 587–598.","mla":"Liu, Jianxin, et al. “Effects of Streaky Structures on the Instability of Supersonic Boundary Layers.” <i>IUTAM Laminar-Turbulent Transition</i>, vol. 38, Springer Nature, 2022, pp. 587–98, doi:<a href=\"https://doi.org/10.1007/978-3-030-67902-6_51\">10.1007/978-3-030-67902-6_51</a>.","ista":"Liu J, Marensi E, Wu X. 2022. Effects of streaky structures on the instability of supersonic boundary layers. IUTAM Laminar-Turbulent Transition. IUTAM Symposium, IUTAM, vol. 38, 587–598.","ama":"Liu J, Marensi E, Wu X. Effects of streaky structures on the instability of supersonic boundary layers. In: <i>IUTAM Laminar-Turbulent Transition</i>. Vol 38. Springer Nature; 2022:587-598. doi:<a href=\"https://doi.org/10.1007/978-3-030-67902-6_51\">10.1007/978-3-030-67902-6_51</a>","short":"J. Liu, E. Marensi, X. Wu, in:, IUTAM Laminar-Turbulent Transition, Springer Nature, 2022, pp. 587–598.","apa":"Liu, J., Marensi, E., &#38; Wu, X. (2022). Effects of streaky structures on the instability of supersonic boundary layers. In <i>IUTAM Laminar-Turbulent Transition</i> (Vol. 38, pp. 587–598). London, United Kingdom: Springer Nature. <a href=\"https://doi.org/10.1007/978-3-030-67902-6_51\">https://doi.org/10.1007/978-3-030-67902-6_51</a>","chicago":"Liu, Jianxin, Elena Marensi, and Xuesong Wu. “Effects of Streaky Structures on the Instability of Supersonic Boundary Layers.” In <i>IUTAM Laminar-Turbulent Transition</i>, 38:587–98. Springer Nature, 2022. <a href=\"https://doi.org/10.1007/978-3-030-67902-6_51\">https://doi.org/10.1007/978-3-030-67902-6_51</a>."},"page":"587-598","date_updated":"2025-05-20T06:08:26Z","publication":"IUTAM Laminar-Turbulent Transition","date_created":"2022-03-04T09:14:34Z","date_published":"2022-01-01T00:00:00Z","month":"01","year":"2022","scopus_import":"1","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","title":"Effects of streaky structures on the instability of supersonic boundary layers","day":"01","language":[{"iso":"eng"}],"alternative_title":["IUTAM"],"OA_type":"closed access","abstract":[{"text":"Streaky structures in the boundary layers are often generated by surface roughness elements and/or free-stream turbulence, and are known to have significant effects on boundary-layer instability. In this paper, we investigate the impact of two forms of streaks on the instability of supersonic boundary layers. The first concerns the streaks generated by an array of spanwise periodic and streamwise elongated surface roughness elements, and our interest is how these streaks influence the lower-branch viscous first modes, whose characteristic wavelength and frequency are on the classical triple-deck scales. By adapting the triple-deck theory in the incompressible regime to the supersonic one, we first derived a simplified system which allows for efficient calculation of the streaks. The asymptotic analysis simplifies a bi-global eigenvalue problem to a one-dimensional problem in the spanwise direction, showing that the instability is controlled at leading order solely by the spanwise-dependent wall shear. In the fundamental configuration, the streaks stabilize first modes at low frequencies but destabilize the high-frequency ones. In the subharmonic configuration, the streaks generally destabilize the first mode across the entire frequency band. Importantly, the spanwise even modes are of radiating nature, i.e. they emit acoustic waves spontaneously to the far field. Streaks of the second form are generated by low-frequency vortical disturbances representing free-stream turbulence. They alter the flow in the entire layer and their effects on instability are investigated by solving the inviscid bi-global eigenvalue problem. Different from the incompressible case, a multitude of compressible instability modes exists, of which the dominant mode is an inviscid instability associated with the spanwise shear. In addition, there exists a separate branch of instability modes that have smaller growth rates but are spontaneously radiating.","lang":"eng"}],"publication_identifier":{"eisbn":["9783030679026"],"issn":["1875-3507"],"isbn":["9783030679019"],"eissn":["1875-3493"]}},{"publication":"Oxford Open Neuroscience","date_updated":"2026-04-07T13:29:13Z","date_created":"2022-02-25T07:52:11Z","ddc":["570"],"month":"07","ec_funded":1,"date_published":"2022-07-07T00:00:00Z","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","year":"2022","article_type":"original","day":"07","title":"Tissue-wide effects override cell-intrinsic gene function in radial neuron migration","corr_author":"1","language":[{"iso":"eng"}],"abstract":[{"text":"The mammalian neocortex is composed of diverse neuronal and glial cell classes that broadly arrange in six distinct laminae. Cortical layers emerge during development and defects in the developmental programs that orchestrate cortical lamination are associated with neurodevelopmental diseases. The developmental principle of cortical layer formation depends on concerted radial projection neuron migration, from their birthplace to their final target position. Radial migration occurs in defined sequential steps, regulated by a large array of signaling pathways. However, based on genetic loss-of-function experiments, most studies have thus far focused on the role of cell-autonomous gene function. Yet, cortical neuron migration in situ is a complex process and migrating neurons traverse along diverse cellular compartments and environments. The role of tissue-wide properties and genetic state in radial neuron migration is however not clear. Here we utilized mosaic analysis with double markers (MADM) technology to either sparsely or globally delete gene function, followed by quantitative single-cell phenotyping. The MADM-based gene ablation paradigms in combination with computational modeling demonstrated that global tissue-wide effects predominate cell-autonomous gene function albeit in a gene-specific manner. Our results thus suggest that the genetic landscape in a tissue critically affects the overall migration phenotype of individual cortical projection neurons. In a broader context, our findings imply that global tissue-wide effects represent an essential component of the underlying etiology associated with focal malformations of cortical development in particular, and neurological diseases in general.","lang":"eng"}],"publication_identifier":{"eissn":["2753-149X"]},"file":[{"access_level":"open_access","date_created":"2023-08-16T08:00:30Z","date_updated":"2023-08-16T08:00:30Z","relation":"main_file","file_size":4846551,"file_name":"2023_OxfordOpenNeuroscience_Hansen.pdf","creator":"dernst","checksum":"822e76e056c07099d1fb27d1ece5941b","success":1,"file_id":"14061","content_type":"application/pdf"}],"tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","short":"CC BY (4.0)","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"},"pmid":1,"article_processing_charge":"No","quality_controlled":"1","article_number":"kvac009","related_material":{"record":[{"id":"12726","status":"public","relation":"dissertation_contains"},{"relation":"dissertation_contains","id":"14530","status":"public"}]},"type":"journal_article","author":[{"last_name":"Hansen","id":"38853E16-F248-11E8-B48F-1D18A9856A87","first_name":"Andi H","full_name":"Hansen, Andi H"},{"orcid":"0000-0002-7462-0048","full_name":"Pauler, Florian","id":"48EA0138-F248-11E8-B48F-1D18A9856A87","first_name":"Florian","last_name":"Pauler"},{"last_name":"Riedl","id":"3BE60946-F248-11E8-B48F-1D18A9856A87","first_name":"Michael","full_name":"Riedl, Michael","orcid":"0000-0003-4844-6311"},{"last_name":"Streicher","full_name":"Streicher, Carmen","id":"36BCB99C-F248-11E8-B48F-1D18A9856A87","first_name":"Carmen"},{"last_name":"Heger","first_name":"Anna-Magdalena","id":"4B76FFD2-F248-11E8-B48F-1D18A9856A87","full_name":"Heger, Anna-Magdalena"},{"id":"2D6B7A9A-F248-11E8-B48F-1D18A9856A87","first_name":"Susanne","full_name":"Laukoter, Susanne","orcid":"0000-0002-7903-3010","last_name":"Laukoter"},{"full_name":"Sommer, Christoph M","orcid":"0000-0003-1216-9105","id":"4DF26D8C-F248-11E8-B48F-1D18A9856A87","first_name":"Christoph M","last_name":"Sommer"},{"first_name":"Armel","id":"2A103192-F248-11E8-B48F-1D18A9856A87","full_name":"Nicolas, Armel","last_name":"Nicolas"},{"last_name":"Hof","id":"3A374330-F248-11E8-B48F-1D18A9856A87","first_name":"Björn","full_name":"Hof, Björn","orcid":"0000-0003-2057-2754"},{"last_name":"Tsai","full_name":"Tsai, Li Huei","first_name":"Li Huei"},{"first_name":"Thomas","full_name":"Rülicke, Thomas","last_name":"Rülicke"},{"last_name":"Hippenmeyer","orcid":"0000-0003-2279-1061","full_name":"Hippenmeyer, Simon","first_name":"Simon","id":"37B36620-F248-11E8-B48F-1D18A9856A87"}],"publication_status":"published","doi":"10.1093/oons/kvac009","intvolume":"         1","acknowledgement":"A.H.H. was a recipient of a DOC Fellowship (24812) of the Austrian Academy of Sciences. This work also received support from IST Austria institutional funds; the People Programme (Marie Curie Actions) of the European Union’s Seventh Framework Programme (FP7/2007–2013) under REA grant agreement No 618444 to S.H.\r\nAPC funding was obtained by IST Austria institutional funds.\r\nWe thank A. Sommer and C. Czepe (VBCF GmbH, NGS Unit), L. Andersen, J. Sonntag and J. Renno for technical support and/or initial experiments; M. Sixt, J. Nimpf and all members of the Hippenmeyer lab for discussion. This research was supported by the Scientific Service Units of IST Austria through resources provided by the Imaging and Optics Facility, Lab Support Facility and Preclinical Facility.","has_accepted_license":"1","issue":"1","status":"public","acknowledged_ssus":[{"_id":"LifeSc"},{"_id":"PreCl"},{"_id":"Bio"}],"external_id":{"pmid":["38596707"]},"publisher":"Oxford University Press","_id":"10791","oa_version":"Published Version","oa":1,"volume":1,"file_date_updated":"2023-08-16T08:00:30Z","project":[{"_id":"25D61E48-B435-11E9-9278-68D0E5697425","grant_number":"618444","call_identifier":"FP7","name":"Molecular Mechanisms of Cerebral Cortex Development"},{"grant_number":"24812","_id":"2625A13E-B435-11E9-9278-68D0E5697425","name":"Molecular mechanisms of radial neuronal migration"}],"department":[{"_id":"SiHi"},{"_id":"BjHo"},{"_id":"LifeSc"},{"_id":"EM-Fac"}],"citation":{"chicago":"Hansen, Andi H, Florian Pauler, Michael Riedl, Carmen Streicher, Anna-Magdalena Heger, Susanne Laukoter, Christoph M Sommer, et al. “Tissue-Wide Effects Override Cell-Intrinsic Gene Function in Radial Neuron Migration.” <i>Oxford Open Neuroscience</i>. Oxford University Press, 2022. <a href=\"https://doi.org/10.1093/oons/kvac009\">https://doi.org/10.1093/oons/kvac009</a>.","ama":"Hansen AH, Pauler F, Riedl M, et al. Tissue-wide effects override cell-intrinsic gene function in radial neuron migration. <i>Oxford Open Neuroscience</i>. 2022;1(1). doi:<a href=\"https://doi.org/10.1093/oons/kvac009\">10.1093/oons/kvac009</a>","short":"A.H. Hansen, F. Pauler, M. Riedl, C. Streicher, A.-M. Heger, S. Laukoter, C.M. Sommer, A. Nicolas, B. Hof, L.H. Tsai, T. Rülicke, S. Hippenmeyer, Oxford Open Neuroscience 1 (2022).","apa":"Hansen, A. H., Pauler, F., Riedl, M., Streicher, C., Heger, A.-M., Laukoter, S., … Hippenmeyer, S. (2022). Tissue-wide effects override cell-intrinsic gene function in radial neuron migration. <i>Oxford Open Neuroscience</i>. Oxford University Press. <a href=\"https://doi.org/10.1093/oons/kvac009\">https://doi.org/10.1093/oons/kvac009</a>","mla":"Hansen, Andi H., et al. “Tissue-Wide Effects Override Cell-Intrinsic Gene Function in Radial Neuron Migration.” <i>Oxford Open Neuroscience</i>, vol. 1, no. 1, kvac009, Oxford University Press, 2022, doi:<a href=\"https://doi.org/10.1093/oons/kvac009\">10.1093/oons/kvac009</a>.","ista":"Hansen AH, Pauler F, Riedl M, Streicher C, Heger A-M, Laukoter S, Sommer CM, Nicolas A, Hof B, Tsai LH, Rülicke T, Hippenmeyer S. 2022. Tissue-wide effects override cell-intrinsic gene function in radial neuron migration. Oxford Open Neuroscience. 1(1), kvac009.","ieee":"A. H. Hansen <i>et al.</i>, “Tissue-wide effects override cell-intrinsic gene function in radial neuron migration,” <i>Oxford Open Neuroscience</i>, vol. 1, no. 1. Oxford University Press, 2022."}},{"user_id":"8b945eb4-e2f2-11eb-945a-df72226e66a9","article_type":"original","scopus_import":"1","year":"2022","day":"10","title":"WASp triggers mechanosensitive actin patches to facilitate immune cell migration in dense tissues","date_updated":"2026-06-07T22:31:00Z","publication":"Developmental Cell","date_created":"2022-01-30T23:01:33Z","page":"47-62.e9","ddc":["570"],"month":"01","ec_funded":1,"date_published":"2022-01-10T00:00:00Z","tmp":{"name":"Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)","image":"/images/cc_by_nc_nd.png","short":"CC BY-NC-ND (4.0)","legal_code_url":"https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode"},"corr_author":"1","language":[{"iso":"eng"}],"publication_identifier":{"issn":["1534-5807"],"eissn":["1878-1551"]},"abstract":[{"text":"When crawling through the body, leukocytes often traverse tissues that are densely packed with extracellular matrix and other cells, and this raises the question: How do leukocytes overcome compressive mechanical loads? Here, we show that the actin cortex of leukocytes is mechanoresponsive and that this responsiveness requires neither force sensing via the nucleus nor adhesive interactions with a substrate. Upon global compression of the cell body as well as local indentation of the plasma membrane, Wiskott-Aldrich syndrome protein (WASp) assembles into dot-like structures, providing activation platforms for Arp2/3 nucleated actin patches. These patches locally push against the external load, which can be obstructing collagen fibers or other cells, and thereby create space to facilitate forward locomotion. We show in vitro and in vivo that this WASp function is rate limiting for ameboid leukocyte migration in dense but not in loose environments and is required for trafficking through diverse tissues such as skin and lymph nodes.","lang":"eng"}],"main_file_link":[{"url":"https://www.sciencedirect.com/science/article/pii/S1534580721009497","open_access":"1"}],"doi":"10.1016/j.devcel.2021.11.024","intvolume":"        57","isi":1,"issue":"1","status":"public","acknowledgement":"We thank N. Darwish-Miranda, F. Leite, F.P. Assen, and A. Eichner for advice and help with experiments. We thank J. Renkawitz, E. Kiermaier, A. Juanes Garcia, and M. Avellaneda for critical reading of the manuscript. We thank M. Driscoll for advice on fluorescent labeling of collagen gels. This research was supported by the Scientific Service Units (SSUs) of IST Austria through resources provided by Molecular Biology Services/Lab Support Facility (LSF)/Bioimaging Facility/Electron Microscopy Facility. This work was funded by grants from the European Research Council ( CoG 724373 ) and the Austrian Science Foundation (FWF) to M.S. F.G. received funding from the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie grant agreement no. 747687.","pmid":1,"article_processing_charge":"No","quality_controlled":"1","related_material":{"record":[{"id":"20149","status":"public","relation":"dissertation_contains"},{"relation":"dissertation_contains","id":"12726","status":"public"},{"status":"public","id":"14530","relation":"dissertation_contains"},{"id":"12401","status":"public","relation":"dissertation_contains"}]},"type":"journal_article","publication_status":"published","author":[{"full_name":"Gaertner, Florian","first_name":"Florian","last_name":"Gaertner"},{"full_name":"Dos Reis Rodrigues, Patricia","orcid":"0000-0003-1681-508X","id":"26E95904-5160-11E9-9C0B-C5B0DC97E90F","first_name":"Patricia","last_name":"Dos Reis Rodrigues"},{"full_name":"De Vries, Ingrid","first_name":"Ingrid","id":"4C7D837E-F248-11E8-B48F-1D18A9856A87","last_name":"De Vries"},{"last_name":"Hons","orcid":"0000-0002-6625-3348","full_name":"Hons, Miroslav","id":"4167FE56-F248-11E8-B48F-1D18A9856A87","first_name":"Miroslav"},{"first_name":"Juan","full_name":"Aguilera, Juan","last_name":"Aguilera"},{"last_name":"Riedl","id":"3BE60946-F248-11E8-B48F-1D18A9856A87","first_name":"Michael","orcid":"0000-0003-4844-6311","full_name":"Riedl, Michael"},{"last_name":"Leithner","orcid":"0000-0002-1073-744X","full_name":"Leithner, Alexander F","first_name":"Alexander F","id":"3B1B77E4-F248-11E8-B48F-1D18A9856A87"},{"full_name":"Tasciyan, Saren","orcid":"0000-0003-1671-393X","first_name":"Saren","id":"4323B49C-F248-11E8-B48F-1D18A9856A87","last_name":"Tasciyan"},{"id":"31DAC7B6-F248-11E8-B48F-1D18A9856A87","first_name":"Aglaja","orcid":"0000-0002-2187-6656","full_name":"Kopf, Aglaja","last_name":"Kopf"},{"last_name":"Merrin","id":"4515C308-F248-11E8-B48F-1D18A9856A87","first_name":"Jack","full_name":"Merrin, Jack","orcid":"0000-0001-5145-4609"},{"full_name":"Zheden, Vanessa","orcid":"0000-0002-9438-4783","first_name":"Vanessa","id":"39C5A68A-F248-11E8-B48F-1D18A9856A87","last_name":"Zheden"},{"last_name":"Kaufmann","orcid":"0000-0001-9735-5315","full_name":"Kaufmann, Walter","first_name":"Walter","id":"3F99E422-F248-11E8-B48F-1D18A9856A87"},{"id":"4E01D6B4-F248-11E8-B48F-1D18A9856A87","first_name":"Robert","orcid":"0000-0001-9843-3522","full_name":"Hauschild, Robert","last_name":"Hauschild"},{"full_name":"Sixt, Michael K","orcid":"0000-0002-6620-9179","first_name":"Michael K","id":"41E9FBEA-F248-11E8-B48F-1D18A9856A87","last_name":"Sixt"}],"_id":"10703","oa_version":"Published Version","oa":1,"volume":57,"project":[{"call_identifier":"H2020","name":"Mechanical Adaptation of Lamellipodial Actin Networks in Migrating Cells","_id":"260AA4E2-B435-11E9-9278-68D0E5697425","grant_number":"747687"},{"grant_number":"724373","_id":"25FE9508-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","name":"Cellular Navigation Along Spatial Gradients"}],"department":[{"_id":"MiSi"},{"_id":"EM-Fac"},{"_id":"NanoFab"},{"_id":"BjHo"}],"citation":{"ieee":"F. Gaertner <i>et al.</i>, “WASp triggers mechanosensitive actin patches to facilitate immune cell migration in dense tissues,” <i>Developmental Cell</i>, vol. 57, no. 1. Cell Press, p. 47–62.e9, 2022.","mla":"Gaertner, Florian, et al. “WASp Triggers Mechanosensitive Actin Patches to Facilitate Immune Cell Migration in Dense Tissues.” <i>Developmental Cell</i>, vol. 57, no. 1, Cell Press, 2022, p. 47–62.e9, doi:<a href=\"https://doi.org/10.1016/j.devcel.2021.11.024\">10.1016/j.devcel.2021.11.024</a>.","ista":"Gaertner F, Dos Reis Rodrigues P, de Vries I, Hons M, Aguilera J, Riedl M, Leithner AF, Tasciyan S, Kopf A, Merrin J, Zheden V, Kaufmann W, Hauschild R, Sixt MK. 2022. WASp triggers mechanosensitive actin patches to facilitate immune cell migration in dense tissues. Developmental Cell. 57(1), 47–62.e9.","short":"F. Gaertner, P. Dos Reis Rodrigues, I. de Vries, M. Hons, J. Aguilera, M. Riedl, A.F. Leithner, S. Tasciyan, A. Kopf, J. Merrin, V. Zheden, W. Kaufmann, R. Hauschild, M.K. Sixt, Developmental Cell 57 (2022) 47–62.e9.","ama":"Gaertner F, Dos Reis Rodrigues P, de Vries I, et al. WASp triggers mechanosensitive actin patches to facilitate immune cell migration in dense tissues. <i>Developmental Cell</i>. 2022;57(1):47-62.e9. doi:<a href=\"https://doi.org/10.1016/j.devcel.2021.11.024\">10.1016/j.devcel.2021.11.024</a>","apa":"Gaertner, F., Dos Reis Rodrigues, P., de Vries, I., Hons, M., Aguilera, J., Riedl, M., … Sixt, M. K. (2022). WASp triggers mechanosensitive actin patches to facilitate immune cell migration in dense tissues. <i>Developmental Cell</i>. Cell Press. <a href=\"https://doi.org/10.1016/j.devcel.2021.11.024\">https://doi.org/10.1016/j.devcel.2021.11.024</a>","chicago":"Gaertner, Florian, Patricia Dos Reis Rodrigues, Ingrid de Vries, Miroslav Hons, Juan Aguilera, Michael Riedl, Alexander F Leithner, et al. “WASp Triggers Mechanosensitive Actin Patches to Facilitate Immune Cell Migration in Dense Tissues.” <i>Developmental Cell</i>. Cell Press, 2022. <a href=\"https://doi.org/10.1016/j.devcel.2021.11.024\">https://doi.org/10.1016/j.devcel.2021.11.024</a>."},"acknowledged_ssus":[{"_id":"LifeSc"},{"_id":"Bio"},{"_id":"EM-Fac"}],"external_id":{"isi":["000768933800005"],"pmid":["34919802"]},"publisher":"Cell Press"},{"title":"Bright single photon emitters with enhanced quantum efficiency in a two-dimensional semiconductor coupled with dielectric nano-antennas","day":"18","year":"2021","scopus_import":"1","article_type":"original","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","date_published":"2021-10-18T00:00:00Z","month":"10","ddc":["530"],"date_updated":"2023-08-14T08:12:12Z","publication":"Nature Communications","date_created":"2021-10-31T23:01:30Z","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","short":"CC BY (4.0)","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"},"file":[{"success":1,"file_id":"10212","content_type":"application/pdf","creator":"cchlebak","checksum":"8580d128389860f732028c521cd5949e","file_name":"2021_NatComm_Sortino.pdf","date_created":"2021-11-03T11:31:24Z","access_level":"open_access","relation":"main_file","file_size":1434201,"date_updated":"2021-11-03T11:31:24Z"}],"publication_identifier":{"eissn":["2041-1723"]},"abstract":[{"lang":"eng","text":"Single photon emitters in atomically-thin semiconductors can be deterministically positioned using strain induced by underlying nano-structures. Here, we couple monolayer WSe2 to high-refractive-index gallium phosphide dielectric nano-antennas providing both optical enhancement and monolayer deformation. For single photon emitters formed on such nano-antennas, we find very low (femto-Joule) saturation pulse energies and up to 104 times brighter photoluminescence than in WSe2 placed on low-refractive-index SiO2 pillars. We show that the key to these observations is the increase on average by a factor of 5 of the quantum efficiency of the emitters coupled to the nano-antennas. This further allows us to gain new insights into their photoluminescence dynamics, revealing the roles of the dark exciton reservoir and Auger processes. We also find that the coherence time of such emitters is limited by intrinsic dephasing processes. Our work establishes dielectric nano-antennas as a platform for high-efficiency quantum light generation in monolayer semiconductors."}],"language":[{"iso":"eng"}],"status":"public","has_accepted_license":"1","acknowledgement":"L.S., P.G.Z., and A.I.T. thank the financial support of the European Graphene Flagship Project under grant agreements 881603 and EPSRC grant EP/S030751/1. L.S. and A.I.T. thank the European Union’s Horizon 2020 research and innovation programme under ITN Spin-NANO Marie Sklodowska-Curie grant agreement no. 676108. P.G.Z. and A.I.T. thank the European Union’s Horizon 2020 research and innovation programme under ITN 4PHOTON Marie Sklodowska-Curie grant agreement no. 721394. J.C., S.A.M., and R.S. acknowledge funding by EPSRC (EP/P033369 and EP/M013812). C.L.P., A.J.B., A.I.T., and A.M.F. acknowledge funding by EPSRC Programme Grant EP/N031776/1. S.A.M. acknowledges the Lee-Lucas Chair in Physics, the Solar Energies go Hybrid (SolTech) programme, and the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy - EXC 2089/1 - 390776260.","isi":1,"doi":"10.1038/s41467-021-26262-3","intvolume":"        12","author":[{"last_name":"Sortino","first_name":"Luca","full_name":"Sortino, Luca"},{"first_name":"Panaiot G.","full_name":"Zotev, Panaiot G.","last_name":"Zotev"},{"last_name":"Phillips","first_name":"Catherine L.","full_name":"Phillips, Catherine L."},{"last_name":"Brash","first_name":"Alistair J.","full_name":"Brash, Alistair J."},{"last_name":"Cambiasso","full_name":"Cambiasso, Javier","first_name":"Javier"},{"orcid":"0000-0001-7173-4923","full_name":"Marensi, Elena","first_name":"Elena","id":"0BE7553A-1004-11EA-B805-18983DDC885E","last_name":"Marensi"},{"last_name":"Fox","full_name":"Fox, A. Mark","first_name":"A. Mark"},{"last_name":"Maier","first_name":"Stefan A.","full_name":"Maier, Stefan A."},{"last_name":"Sapienza","full_name":"Sapienza, Riccardo","first_name":"Riccardo"},{"last_name":"Tartakovskii","full_name":"Tartakovskii, Alexander I.","first_name":"Alexander I."}],"publication_status":"published","type":"journal_article","article_number":"6063","quality_controlled":"1","article_processing_charge":"No","department":[{"_id":"BjHo"}],"citation":{"apa":"Sortino, L., Zotev, P. G., Phillips, C. L., Brash, A. J., Cambiasso, J., Marensi, E., … Tartakovskii, A. I. (2021). Bright single photon emitters with enhanced quantum efficiency in a two-dimensional semiconductor coupled with dielectric nano-antennas. <i>Nature Communications</i>. Springer Nature. <a href=\"https://doi.org/10.1038/s41467-021-26262-3\">https://doi.org/10.1038/s41467-021-26262-3</a>","ama":"Sortino L, Zotev PG, Phillips CL, et al. Bright single photon emitters with enhanced quantum efficiency in a two-dimensional semiconductor coupled with dielectric nano-antennas. <i>Nature Communications</i>. 2021;12. doi:<a href=\"https://doi.org/10.1038/s41467-021-26262-3\">10.1038/s41467-021-26262-3</a>","short":"L. Sortino, P.G. Zotev, C.L. Phillips, A.J. Brash, J. Cambiasso, E. Marensi, A.M. Fox, S.A. Maier, R. Sapienza, A.I. Tartakovskii, Nature Communications 12 (2021).","chicago":"Sortino, Luca, Panaiot G. Zotev, Catherine L. Phillips, Alistair J. Brash, Javier Cambiasso, Elena Marensi, A. Mark Fox, Stefan A. Maier, Riccardo Sapienza, and Alexander I. Tartakovskii. “Bright Single Photon Emitters with Enhanced Quantum Efficiency in a Two-Dimensional Semiconductor Coupled with Dielectric Nano-Antennas.” <i>Nature Communications</i>. Springer Nature, 2021. <a href=\"https://doi.org/10.1038/s41467-021-26262-3\">https://doi.org/10.1038/s41467-021-26262-3</a>.","ieee":"L. Sortino <i>et al.</i>, “Bright single photon emitters with enhanced quantum efficiency in a two-dimensional semiconductor coupled with dielectric nano-antennas,” <i>Nature Communications</i>, vol. 12. Springer Nature, 2021.","ista":"Sortino L, Zotev PG, Phillips CL, Brash AJ, Cambiasso J, Marensi E, Fox AM, Maier SA, Sapienza R, Tartakovskii AI. 2021. Bright single photon emitters with enhanced quantum efficiency in a two-dimensional semiconductor coupled with dielectric nano-antennas. Nature Communications. 12, 6063.","mla":"Sortino, Luca, et al. “Bright Single Photon Emitters with Enhanced Quantum Efficiency in a Two-Dimensional Semiconductor Coupled with Dielectric Nano-Antennas.” <i>Nature Communications</i>, vol. 12, 6063, Springer Nature, 2021, doi:<a href=\"https://doi.org/10.1038/s41467-021-26262-3\">10.1038/s41467-021-26262-3</a>."},"volume":12,"file_date_updated":"2021-11-03T11:31:24Z","oa":1,"_id":"10203","oa_version":"Published Version","external_id":{"arxiv":["2103.16986"],"isi":["000708601800015"]},"publisher":"Springer Nature","arxiv":1},{"file":[{"access_level":"open_access","date_created":"2021-01-11T07:50:32Z","relation":"main_file","date_updated":"2021-01-11T07:50:32Z","file_size":9456389,"file_id":"9003","success":1,"content_type":"application/pdf","creator":"dernst","checksum":"3ba3dd8b7eecff713b72c5e9ba30d626","file_name":"2021_Entropy_Avila.pdf"}],"abstract":[{"lang":"eng","text":"In many basic shear flows, such as pipe, Couette, and channel flow, turbulence does not\r\narise from an instability of the laminar state, and both dynamical states co-exist. With decreasing flow speed (i.e., decreasing Reynolds number) the fraction of fluid in laminar motion increases while turbulence recedes and eventually the entire flow relaminarizes. The first step towards understanding the nature of this transition is to determine if the phase change is of either first or second order. In the former case, the turbulent fraction would drop discontinuously to zero as the Reynolds number decreases while in the latter the process would be continuous. For Couette flow, the flow between two parallel plates, earlier studies suggest a discontinuous scenario. In the present study we realize a Couette flow between two concentric cylinders which allows studies to be carried out in large aspect ratios and for extensive observation times. The presented measurements show that the transition in this circular Couette geometry is continuous suggesting that former studies were limited by finite size effects. A further characterization of this transition, in particular its relation to the directed percolation universality class, requires even larger system sizes than presently available. "}],"publication_identifier":{"eissn":["1099-4300"]},"language":[{"iso":"eng"}],"tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","short":"CC BY (4.0)","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"},"date_published":"2021-01-01T00:00:00Z","month":"01","ddc":["530"],"date_updated":"2023-08-07T13:31:07Z","publication":"Entropy","date_created":"2021-01-10T23:01:17Z","title":"Second-order phase transition in counter-rotating taylor-couette flow experiment","day":"01","year":"2021","article_type":"original","scopus_import":"1","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","external_id":{"pmid":["33396499"],"isi":["000610135400001"]},"publisher":"MDPI","department":[{"_id":"BjHo"}],"citation":{"mla":"Avila, Kerstin, and Björn Hof. “Second-Order Phase Transition in Counter-Rotating Taylor-Couette Flow Experiment.” <i>Entropy</i>, vol. 23, no. 1, 58, MDPI, 2021, doi:<a href=\"https://doi.org/10.3390/e23010058\">10.3390/e23010058</a>.","ista":"Avila K, Hof B. 2021. Second-order phase transition in counter-rotating taylor-couette flow experiment. Entropy. 23(1), 58.","ieee":"K. Avila and B. Hof, “Second-order phase transition in counter-rotating taylor-couette flow experiment,” <i>Entropy</i>, vol. 23, no. 1. MDPI, 2021.","chicago":"Avila, Kerstin, and Björn Hof. “Second-Order Phase Transition in Counter-Rotating Taylor-Couette Flow Experiment.” <i>Entropy</i>. MDPI, 2021. <a href=\"https://doi.org/10.3390/e23010058\">https://doi.org/10.3390/e23010058</a>.","apa":"Avila, K., &#38; Hof, B. (2021). Second-order phase transition in counter-rotating taylor-couette flow experiment. <i>Entropy</i>. MDPI. <a href=\"https://doi.org/10.3390/e23010058\">https://doi.org/10.3390/e23010058</a>","short":"K. Avila, B. Hof, Entropy 23 (2021).","ama":"Avila K, Hof B. Second-order phase transition in counter-rotating taylor-couette flow experiment. <i>Entropy</i>. 2021;23(1). doi:<a href=\"https://doi.org/10.3390/e23010058\">10.3390/e23010058</a>"},"file_date_updated":"2021-01-11T07:50:32Z","volume":23,"oa":1,"_id":"8999","oa_version":"Published Version","publication_status":"published","author":[{"full_name":"Avila, Kerstin","first_name":"Kerstin","id":"fcf74381-53e1-11eb-a6dc-b0e2acf78757","last_name":"Avila"},{"id":"3A374330-F248-11E8-B48F-1D18A9856A87","first_name":"Björn","orcid":"0000-0003-2057-2754","full_name":"Hof, Björn","last_name":"Hof"}],"type":"journal_article","article_number":"58","pmid":1,"article_processing_charge":"No","quality_controlled":"1","issue":"1","has_accepted_license":"1","acknowledgement":"This research was funded by the Central Research Development Fund of the University of\r\nBremen grant number ZF04B /2019/FB04 Avila_Kerstin (“Independent Project for Postdocs”). Shreyas Jalikop is acknowledged for recording some of the lifetime measurements\r\n","status":"public","isi":1,"doi":"10.3390/e23010058","intvolume":"        23"},{"publisher":"Cambridge University Press","external_id":{"isi":["000618034400001"]},"file_date_updated":"2021-03-03T09:49:34Z","volume":912,"oa_version":"Published Version","_id":"9207","oa":1,"department":[{"_id":"BjHo"}],"citation":{"mla":"Klotz, Lukasz, et al. “Experimental Measurements in Plane Couette-Poiseuille Flow: Dynamics of the Large- and Small-Scale Flow.” <i>Journal of Fluid Mechanics</i>, vol. 912, A24, Cambridge University Press, 2021, doi:<a href=\"https://doi.org/10.1017/jfm.2020.1089\">10.1017/jfm.2020.1089</a>.","ista":"Klotz L, Pavlenko AM, Wesfreid JE. 2021. Experimental measurements in plane Couette-Poiseuille flow: Dynamics of the large- and small-scale flow. Journal of Fluid Mechanics. 912, A24.","ieee":"L. Klotz, A. M. Pavlenko, and J. E. Wesfreid, “Experimental measurements in plane Couette-Poiseuille flow: Dynamics of the large- and small-scale flow,” <i>Journal of Fluid Mechanics</i>, vol. 912. Cambridge University Press, 2021.","chicago":"Klotz, Lukasz, A. M. Pavlenko, and J. E. Wesfreid. “Experimental Measurements in Plane Couette-Poiseuille Flow: Dynamics of the Large- and Small-Scale Flow.” <i>Journal of Fluid Mechanics</i>. Cambridge University Press, 2021. <a href=\"https://doi.org/10.1017/jfm.2020.1089\">https://doi.org/10.1017/jfm.2020.1089</a>.","short":"L. Klotz, A.M. Pavlenko, J.E. Wesfreid, Journal of Fluid Mechanics 912 (2021).","apa":"Klotz, L., Pavlenko, A. M., &#38; Wesfreid, J. E. (2021). Experimental measurements in plane Couette-Poiseuille flow: Dynamics of the large- and small-scale flow. <i>Journal of Fluid Mechanics</i>. Cambridge University Press. <a href=\"https://doi.org/10.1017/jfm.2020.1089\">https://doi.org/10.1017/jfm.2020.1089</a>","ama":"Klotz L, Pavlenko AM, Wesfreid JE. Experimental measurements in plane Couette-Poiseuille flow: Dynamics of the large- and small-scale flow. <i>Journal of Fluid Mechanics</i>. 2021;912. doi:<a href=\"https://doi.org/10.1017/jfm.2020.1089\">10.1017/jfm.2020.1089</a>"},"project":[{"name":"ISTplus - Postdoctoral Fellowships","call_identifier":"H2020","grant_number":"754411","_id":"260C2330-B435-11E9-9278-68D0E5697425"}],"article_number":"A24","quality_controlled":"1","article_processing_charge":"Yes (via OA deal)","publication_status":"published","author":[{"last_name":"Klotz","id":"2C9AF1C2-F248-11E8-B48F-1D18A9856A87","first_name":"Lukasz","full_name":"Klotz, Lukasz","orcid":"0000-0003-1740-7635"},{"last_name":"Pavlenko","first_name":"A. M.","full_name":"Pavlenko, A. M."},{"last_name":"Wesfreid","first_name":"J. E.","full_name":"Wesfreid, J. E."}],"type":"journal_article","isi":1,"intvolume":"       912","doi":"10.1017/jfm.2020.1089","acknowledgement":"We thank Y. Duguet, S. Gomé, G. Lemoult, T. Liu, B. Semin and L.S. Tuckerman for\r\nfruitful discussions. \r\nThis work was supported by a grant, TRANSFLOW, provided by the Agence Nationale de\r\nla Recherche (ANR). A.M.P. was partially supported by the French Embassy in Russia (I.I. Mechnikov scholarship) and by the Russian Science Foundation (project no. 18-79-00189). L.K. was partially supported by the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement no. 754411.","status":"public","has_accepted_license":"1","language":[{"iso":"eng"}],"file":[{"file_name":"2021_JourFluidMechanics_Klotz.pdf","creator":"dernst","checksum":"b8020d6338667673e34fde0608913dd2","file_id":"9220","success":1,"content_type":"application/pdf","access_level":"open_access","date_created":"2021-03-03T09:49:34Z","date_updated":"2021-03-03T09:49:34Z","relation":"main_file","file_size":4124471}],"publication_identifier":{"issn":["0022-1120"],"eissn":["1469-7645"]},"abstract":[{"text":"In this paper we experimentally study the transitional range of Reynolds numbers in\r\nplane Couette–Poiseuille flow, focusing our attention on the localized turbulent structures\r\ntriggered by a strong impulsive jet and the large-scale flow generated around these\r\nstructures. We present a detailed investigation of the large-scale flow and show how\r\nits amplitude depends on Reynolds number and amplitude perturbation. In addition,\r\nwe characterize the initial dynamics of the localized turbulent spot, which includes the\r\ncoupling between the small and large scales, as well as the dependence of the advection\r\nspeed on the large-scale flow generated around the spot. Finally, we provide the first\r\nexperimental measurements of the large-scale flow around an oblique turbulent band.","lang":"eng"}],"tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","short":"CC BY (4.0)","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"},"ddc":["530"],"date_created":"2021-02-28T23:01:25Z","publication":"Journal of Fluid Mechanics","date_updated":"2025-04-14T07:43:51Z","date_published":"2021-02-15T00:00:00Z","ec_funded":1,"month":"02","article_type":"original","year":"2021","scopus_import":"1","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","title":"Experimental measurements in plane Couette-Poiseuille flow: Dynamics of the large- and small-scale flow","day":"15"},{"year":"2021","scopus_import":"1","article_type":"original","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","title":"Decay of streaks and rolls in plane Couette-Poiseuille flow","day":"17","date_created":"2021-03-28T22:01:42Z","publication":"Journal of Fluid Mechanics","date_updated":"2023-08-07T14:30:11Z","date_published":"2021-03-17T00:00:00Z","month":"03","language":[{"iso":"eng"}],"main_file_link":[{"url":"https://arxiv.org/abs/2008.08851","open_access":"1"}],"abstract":[{"lang":"eng","text":"We report the results of an experimental investigation into the decay of turbulence in plane Couette–Poiseuille flow using ‘quench’ experiments where the flow laminarises after a sudden reduction in Reynolds number Re. Specifically, we study the velocity field in the streamwise–spanwise plane. We show that the spanwise velocity containing rolls decays faster than the streamwise velocity, which displays elongated regions of higher or lower velocity called streaks. At final Reynolds numbers above 425, the decay of streaks displays two stages: first a slow decay when rolls are present and secondly a more rapid decay of streaks alone. The difference in behaviour results from the regeneration of streaks by rolls, called the lift-up effect. We define the turbulent fraction as the portion of the flow containing turbulence and this is estimated by thresholding the spanwise velocity component. It decreases linearly with time in the whole range of final Re. The corresponding decay slope increases linearly with final Re. The extrapolated value at which this decay slope vanishes is Reaz≈656±10, close to Reg≈670 at which turbulence is self-sustained. The decay of the energy computed from the spanwise velocity component is found to be exponential. The corresponding decay rate increases linearly with Re, with an extrapolated vanishing value at ReAz≈688±10. This value is also close to the value at which the turbulence is self-sustained, showing that valuable information on the transition can be obtained over a wide range of Re."}],"publication_identifier":{"eissn":["1469-7645"],"issn":["0022-1120"]},"isi":1,"intvolume":"       915","doi":"10.1017/jfm.2021.89","status":"public","acknowledgement":"We gratefully acknowledge Joran Rolland, Yohann Duguet, Romain Monchaux, S´ebastien Gom´e, Laurette Tuckerman, Dwight Barkley, Olivier Dauchot and Sabine Bottin for fruitful discussions. We thank Xavier Benoit-Gonin, Amaury Fourgeaud, Thierry Darnige, Olivier Brouard and Justine Laurent for technical help. This work has benefited from the ANR TransFlow, and by starting grants obtained by B.S. from CNRS (INSIS) and ESPCI. T.M. was\r\nsupported by a Joliot visiting professorship grant from ESPCI.","article_number":"A65","quality_controlled":"1","article_processing_charge":"No","publication_status":"published","author":[{"last_name":"Liu","full_name":"Liu, T.","first_name":"T."},{"last_name":"Semin","first_name":"B.","full_name":"Semin, B."},{"full_name":"Klotz, Lukasz","orcid":"0000-0003-1740-7635","first_name":"Lukasz","id":"2C9AF1C2-F248-11E8-B48F-1D18A9856A87","last_name":"Klotz"},{"last_name":"Godoy-Diana","full_name":"Godoy-Diana, R.","first_name":"R."},{"first_name":"J. E.","full_name":"Wesfreid, J. E.","last_name":"Wesfreid"},{"first_name":"T.","full_name":"Mullin, T.","last_name":"Mullin"}],"type":"journal_article","volume":915,"oa":1,"_id":"9297","oa_version":"Preprint","citation":{"ieee":"T. Liu, B. Semin, L. Klotz, R. Godoy-Diana, J. E. Wesfreid, and T. Mullin, “Decay of streaks and rolls in plane Couette-Poiseuille flow,” <i>Journal of Fluid Mechanics</i>, vol. 915. Cambridge University Press, 2021.","mla":"Liu, T., et al. “Decay of Streaks and Rolls in Plane Couette-Poiseuille Flow.” <i>Journal of Fluid Mechanics</i>, vol. 915, A65, Cambridge University Press, 2021, doi:<a href=\"https://doi.org/10.1017/jfm.2021.89\">10.1017/jfm.2021.89</a>.","ista":"Liu T, Semin B, Klotz L, Godoy-Diana R, Wesfreid JE, Mullin T. 2021. Decay of streaks and rolls in plane Couette-Poiseuille flow. Journal of Fluid Mechanics. 915, A65.","apa":"Liu, T., Semin, B., Klotz, L., Godoy-Diana, R., Wesfreid, J. E., &#38; Mullin, T. (2021). Decay of streaks and rolls in plane Couette-Poiseuille flow. <i>Journal of Fluid Mechanics</i>. Cambridge University Press. <a href=\"https://doi.org/10.1017/jfm.2021.89\">https://doi.org/10.1017/jfm.2021.89</a>","ama":"Liu T, Semin B, Klotz L, Godoy-Diana R, Wesfreid JE, Mullin T. Decay of streaks and rolls in plane Couette-Poiseuille flow. <i>Journal of Fluid Mechanics</i>. 2021;915. doi:<a href=\"https://doi.org/10.1017/jfm.2021.89\">10.1017/jfm.2021.89</a>","short":"T. Liu, B. Semin, L. Klotz, R. Godoy-Diana, J.E. Wesfreid, T. Mullin, Journal of Fluid Mechanics 915 (2021).","chicago":"Liu, T., B. Semin, Lukasz Klotz, R. Godoy-Diana, J. E. Wesfreid, and T. Mullin. “Decay of Streaks and Rolls in Plane Couette-Poiseuille Flow.” <i>Journal of Fluid Mechanics</i>. Cambridge University Press, 2021. <a href=\"https://doi.org/10.1017/jfm.2021.89\">https://doi.org/10.1017/jfm.2021.89</a>."},"department":[{"_id":"BjHo"}],"arxiv":1,"publisher":"Cambridge University Press","external_id":{"arxiv":["2008.08851"],"isi":["000629677500001"]}},{"type":"journal_article","publication_status":"published","author":[{"orcid":"0000-0001-7173-4923","full_name":"Marensi, Elena","id":"0BE7553A-1004-11EA-B805-18983DDC885E","first_name":"Elena","last_name":"Marensi"},{"full_name":"He, Shuisheng","first_name":"Shuisheng","last_name":"He"},{"full_name":"Willis, Ashley P.","first_name":"Ashley P.","last_name":"Willis"}],"article_processing_charge":"Yes (via OA deal)","quality_controlled":"1","article_number":"A17","acknowledgement":"The anonymous referees are kindly acknowledged for their useful suggestions andcomments.","has_accepted_license":"1","status":"public","intvolume":"       919","doi":"10.1017/jfm.2021.371","isi":1,"publisher":"Cambridge University Press","external_id":{"arxiv":["2008.13486"],"isi":["000653785000001"]},"arxiv":1,"department":[{"_id":"BjHo"}],"citation":{"apa":"Marensi, E., He, S., &#38; Willis, A. P. (2021). Suppression of turbulence and travelling waves in a vertical heated pipe. <i>Journal of Fluid Mechanics</i>. Cambridge University Press. <a href=\"https://doi.org/10.1017/jfm.2021.371\">https://doi.org/10.1017/jfm.2021.371</a>","short":"E. Marensi, S. He, A.P. Willis, Journal of Fluid Mechanics 919 (2021).","ama":"Marensi E, He S, Willis AP. Suppression of turbulence and travelling waves in a vertical heated pipe. <i>Journal of Fluid Mechanics</i>. 2021;919. doi:<a href=\"https://doi.org/10.1017/jfm.2021.371\">10.1017/jfm.2021.371</a>","chicago":"Marensi, Elena, Shuisheng He, and Ashley P. Willis. “Suppression of Turbulence and Travelling Waves in a Vertical Heated Pipe.” <i>Journal of Fluid Mechanics</i>. Cambridge University Press, 2021. <a href=\"https://doi.org/10.1017/jfm.2021.371\">https://doi.org/10.1017/jfm.2021.371</a>.","ieee":"E. Marensi, S. He, and A. P. Willis, “Suppression of turbulence and travelling waves in a vertical heated pipe,” <i>Journal of Fluid Mechanics</i>, vol. 919. Cambridge University Press, 2021.","mla":"Marensi, Elena, et al. “Suppression of Turbulence and Travelling Waves in a Vertical Heated Pipe.” <i>Journal of Fluid Mechanics</i>, vol. 919, A17, Cambridge University Press, 2021, doi:<a href=\"https://doi.org/10.1017/jfm.2021.371\">10.1017/jfm.2021.371</a>.","ista":"Marensi E, He S, Willis AP. 2021. Suppression of turbulence and travelling waves in a vertical heated pipe. Journal of Fluid Mechanics. 919, A17."},"oa_version":"Published Version","_id":"9467","oa":1,"file_date_updated":"2021-08-03T09:53:28Z","volume":919,"month":"07","date_published":"2021-07-25T00:00:00Z","date_created":"2021-06-06T22:01:30Z","publication":"Journal of Fluid Mechanics","date_updated":"2025-07-10T12:01:47Z","ddc":["530"],"day":"25","title":"Suppression of turbulence and travelling waves in a vertical heated pipe","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","scopus_import":"1","article_type":"original","year":"2021","publication_identifier":{"issn":["0022-1120"],"eissn":["1469-7645"]},"abstract":[{"lang":"eng","text":"Turbulence in the flow of fluid through a pipe can be suppressed by buoyancy forces. As the suppression of turbulence leads to severe heat transfer deterioration, this is an important and undesirable phenomenon in both heating and cooling applications. Vertical flow is often considered, as the axial buoyancy force can help drive the flow. With heating measured by the buoyancy parameter 𝐶, our direct numerical simulations show that shear-driven turbulence may either be completely laminarised or it transitions to a relatively quiescent convection-driven state. Buoyancy forces cause a flattening of the base flow profile, which in isothermal pipe flow has recently been linked to complete suppression of turbulence (Kühnen et al., Nat. Phys., vol. 14, 2018, pp. 386–390), and the flattened laminar base profile has enhanced nonlinear stability (Marensi et al., J. Fluid Mech., vol. 863, 2019, pp. 50–875). In agreement with these findings, the nonlinear lower-branch travelling-wave solution analysed here, which is believed to mediate transition to turbulence in isothermal pipe flow, is shown to be suppressed by buoyancy. A linear instability of the laminar base flow is responsible for the appearance of the relatively quiescent convection driven state for 𝐶≳4 across the range of Reynolds numbers considered. In the suppression of turbulence, however, i.e. in the transition from turbulence, we find clearer association with the analysis of He et al. (J. Fluid Mech., vol. 809, 2016, pp. 31–71) than with the above dynamical systems approach, which describes better the transition to turbulence. The laminarisation criterion He et al. propose, based on an apparent Reynolds number of the flow as measured by its driving pressure gradient, is found to capture the critical 𝐶=𝐶𝑐𝑟(𝑅𝑒) above which the flow will be laminarised or switch to the convection-driven type. Our analysis suggests that it is the weakened rolls, rather than the streaks, which appear to be critical for laminarisation."}],"file":[{"relation":"main_file","date_updated":"2021-08-03T09:53:28Z","file_size":4087358,"date_created":"2021-08-03T09:53:28Z","access_level":"open_access","content_type":"application/pdf","file_id":"9766","success":1,"file_name":"2021_JournalFluidMechanics_Marensi.pdf","checksum":"867ad077e45c181c2c5ec1311ba27c41","creator":"kschuh"}],"corr_author":"1","language":[{"iso":"eng"}],"tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","short":"CC BY (4.0)","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"}},{"language":[{"iso":"eng"}],"file":[{"relation":"main_file","file_size":1176573,"date_updated":"2021-05-25T14:18:40Z","date_created":"2021-05-25T14:18:40Z","access_level":"open_access","content_type":"application/pdf","success":1,"file_id":"9426","checksum":"fe26c1b8a7da1ae07a6c03f80ff06ea1","creator":"kschuh","file_name":"2021_NatureCommunications_Scarselli.pdf"}],"publication_identifier":{"eissn":["2041-1723"]},"abstract":[{"text":"High impact epidemics constitute one of the largest threats humanity is facing in the 21st century. In the absence of pharmaceutical interventions, physical distancing together with testing, contact tracing and quarantining are crucial in slowing down epidemic dynamics. Yet, here we show that if testing capacities are limited, containment may fail dramatically because such combined countermeasures drastically change the rules of the epidemic transition: Instead of continuous, the response to countermeasures becomes discontinuous. Rather than following the conventional exponential growth, the outbreak that is initially strongly suppressed eventually accelerates and scales faster than exponential during an explosive growth period. As a consequence, containment measures either suffice to stop the outbreak at low total case numbers or fail catastrophically if marginally too weak, thus implying large uncertainties in reliably estimating overall epidemic dynamics, both during initial phases and during second wave scenarios.","lang":"eng"}],"tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","short":"CC BY (4.0)","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"},"ddc":["570"],"date_created":"2021-05-23T22:01:42Z","date_updated":"2026-04-03T09:37:18Z","publication":"Nature Communications","date_published":"2021-05-10T00:00:00Z","month":"05","scopus_import":"1","year":"2021","article_type":"original","user_id":"ba8df636-2132-11f1-aed0-ed93e2281fdd","title":"Discontinuous epidemic transition due to limited testing","day":"10","publisher":"Springer Nature","external_id":{"pmid":["33972522"],"isi":["000687305500044"]},"volume":12,"file_date_updated":"2021-05-25T14:18:40Z","_id":"9407","oa_version":"Published Version","oa":1,"department":[{"_id":"BjHo"}],"citation":{"apa":"Scarselli, D., Budanur, N. B., Timme, M., &#38; Hof, B. (2021). Discontinuous epidemic transition due to limited testing. <i>Nature Communications</i>. Springer Nature. <a href=\"https://doi.org/10.1038/s41467-021-22725-9\">https://doi.org/10.1038/s41467-021-22725-9</a>","ama":"Scarselli D, Budanur NB, Timme M, Hof B. Discontinuous epidemic transition due to limited testing. <i>Nature Communications</i>. 2021;12(1). doi:<a href=\"https://doi.org/10.1038/s41467-021-22725-9\">10.1038/s41467-021-22725-9</a>","short":"D. Scarselli, N.B. Budanur, M. Timme, B. Hof, Nature Communications 12 (2021).","chicago":"Scarselli, Davide, Nazmi B Budanur, Marc Timme, and Björn Hof. “Discontinuous Epidemic Transition Due to Limited Testing.” <i>Nature Communications</i>. Springer Nature, 2021. <a href=\"https://doi.org/10.1038/s41467-021-22725-9\">https://doi.org/10.1038/s41467-021-22725-9</a>.","ieee":"D. Scarselli, N. B. Budanur, M. Timme, and B. Hof, “Discontinuous epidemic transition due to limited testing,” <i>Nature Communications</i>, vol. 12, no. 1. Springer Nature, 2021.","mla":"Scarselli, Davide, et al. “Discontinuous Epidemic Transition Due to Limited Testing.” <i>Nature Communications</i>, vol. 12, no. 1, 2586, Springer Nature, 2021, doi:<a href=\"https://doi.org/10.1038/s41467-021-22725-9\">10.1038/s41467-021-22725-9</a>.","ista":"Scarselli D, Budanur NB, Timme M, Hof B. 2021. Discontinuous epidemic transition due to limited testing. Nature Communications. 12(1), 2586."},"related_material":{"link":[{"description":"News on IST Homepage","relation":"press_release","url":"https://ist.ac.at/en/news/smashing-the-covid-curve/"}]},"article_number":"2586","quality_controlled":"1","article_processing_charge":"No","pmid":1,"author":[{"last_name":"Scarselli","full_name":"Scarselli, Davide","orcid":"0000-0001-5227-4271","id":"40315C30-F248-11E8-B48F-1D18A9856A87","first_name":"Davide"},{"last_name":"Budanur","full_name":"Budanur, Nazmi B","orcid":"0000-0003-0423-5010","first_name":"Nazmi B","id":"3EA1010E-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Marc","full_name":"Timme, Marc","last_name":"Timme"},{"first_name":"Björn","id":"3A374330-F248-11E8-B48F-1D18A9856A87","full_name":"Hof, Björn","orcid":"0000-0003-2057-2754","last_name":"Hof"}],"publication_status":"published","type":"journal_article","isi":1,"intvolume":"        12","doi":"10.1038/s41467-021-22725-9","issue":"1","status":"public","acknowledgement":"The authors thank Malte Schröder for valuable discussions and creating the scale-free network topologies. B.H. thanks Mukund Vasudevan for helpful discussion. The research by M.T. was supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany´s Excellence Strategy–EXC-2068–390729961–Cluster of Excellence Physics of Life of TU Dresden.","has_accepted_license":"1"},{"day":"18","title":"Coarse graining the state space of a turbulent flow using periodic orbits","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","scopus_import":"1","article_type":"letter_note","year":"2021","month":"06","date_published":"2021-06-18T00:00:00Z","date_created":"2021-06-16T15:45:36Z","publication":"Physical Review Letters","date_updated":"2026-04-07T11:47:05Z","publication_identifier":{"issn":["0031-9007"],"eissn":["1079-7114"]},"abstract":[{"lang":"eng","text":"We show that turbulent dynamics that arise in simulations of the three-dimensional Navier--Stokes equations in a triply-periodic domain under sinusoidal forcing can be described as transient visits to the neighborhoods of unstable time-periodic solutions. Based on this description, we reduce the original system with more than 10^5 degrees of freedom to a 17-node Markov chain where each node corresponds to the neighborhood of a periodic orbit. The model accurately reproduces long-term averages of the system's observables as weighted sums over the periodic orbits.\r\n"}],"main_file_link":[{"url":"https://arxiv.org/abs/2007.02584","open_access":"1"}],"corr_author":"1","language":[{"iso":"eng"}],"acknowledgement":"We thank the referees for improving this Letter with their comments. We acknowledge stimulating discussions with\r\nH. Edelsbrunner. This work was supported by Grant No. 662960 from the Simons Foundation (B. H.). The numerical calculations were performed at TUBITAK ULAKBIM High Performance and Grid Computing Center (TRUBA resources) and IST Austria High Performance Computing cluster.","issue":"24","status":"public","intvolume":"       126","doi":"10.1103/PhysRevLett.126.244502","isi":1,"type":"journal_article","publication_status":"published","author":[{"first_name":"Gökhan","id":"66E74FA2-D8BF-11E9-8249-8DE2E5697425","orcid":"0000-0002-8490-9312","full_name":"Yalniz, Gökhan","last_name":"Yalniz"},{"last_name":"Hof","orcid":"0000-0003-2057-2754","full_name":"Hof, Björn","id":"3A374330-F248-11E8-B48F-1D18A9856A87","first_name":"Björn"},{"last_name":"Budanur","first_name":"Nazmi B","id":"3EA1010E-F248-11E8-B48F-1D18A9856A87","full_name":"Budanur, Nazmi B","orcid":"0000-0003-0423-5010"}],"quality_controlled":"1","article_processing_charge":"No","related_material":{"record":[{"id":"19591","status":"returned","relation":"popular_science"},{"id":"19684","status":"public","relation":"dissertation_contains"}],"link":[{"relation":"press_release","url":"https://ist.ac.at/en/news/turbulent-flow-simplified/","description":"News on IST Homepage"}]},"article_number":"244502","department":[{"_id":"GradSch"},{"_id":"BjHo"}],"citation":{"chicago":"Yalniz, Gökhan, Björn Hof, and Nazmi B Budanur. “Coarse Graining the State Space of a Turbulent Flow Using Periodic Orbits.” <i>Physical Review Letters</i>. American Physical Society, 2021. <a href=\"https://doi.org/10.1103/PhysRevLett.126.244502\">https://doi.org/10.1103/PhysRevLett.126.244502</a>.","apa":"Yalniz, G., Hof, B., &#38; Budanur, N. B. (2021). Coarse graining the state space of a turbulent flow using periodic orbits. <i>Physical Review Letters</i>. American Physical Society. <a href=\"https://doi.org/10.1103/PhysRevLett.126.244502\">https://doi.org/10.1103/PhysRevLett.126.244502</a>","short":"G. Yalniz, B. Hof, N.B. Budanur, Physical Review Letters 126 (2021).","ama":"Yalniz G, Hof B, Budanur NB. Coarse graining the state space of a turbulent flow using periodic orbits. <i>Physical Review Letters</i>. 2021;126(24). doi:<a href=\"https://doi.org/10.1103/PhysRevLett.126.244502\">10.1103/PhysRevLett.126.244502</a>","ista":"Yalniz G, Hof B, Budanur NB. 2021. Coarse graining the state space of a turbulent flow using periodic orbits. Physical Review Letters. 126(24), 244502.","mla":"Yalniz, Gökhan, et al. “Coarse Graining the State Space of a Turbulent Flow Using Periodic Orbits.” <i>Physical Review Letters</i>, vol. 126, no. 24, 244502, American Physical Society, 2021, doi:<a href=\"https://doi.org/10.1103/PhysRevLett.126.244502\">10.1103/PhysRevLett.126.244502</a>.","ieee":"G. Yalniz, B. Hof, and N. B. Budanur, “Coarse graining the state space of a turbulent flow using periodic orbits,” <i>Physical Review Letters</i>, vol. 126, no. 24. American Physical Society, 2021."},"project":[{"grant_number":"662960","_id":"238598C6-32DE-11EA-91FC-C7463DDC885E","name":"Revisiting the Turbulence Problem Using Statistical Mechanics"}],"oa":1,"_id":"9558","oa_version":"Preprint","volume":126,"acknowledged_ssus":[{"_id":"ScienComp"}],"publisher":"American Physical Society","external_id":{"arxiv":["2007.02584"],"isi":["000663310100008"]},"arxiv":1},{"keyword":["multidisciplinary","elastoinertial turbulence","viscoelastic flows","elastic instability","drag reduction"],"main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/2103.00023"}],"abstract":[{"lang":"eng","text":"Turbulence generally arises in shear flows if velocities and hence, inertial forces are sufficiently large. In striking contrast, viscoelastic fluids can exhibit disordered motion even at vanishing inertia. Intermediate between these cases, a state of chaotic motion, “elastoinertial turbulence” (EIT), has been observed in a narrow Reynolds number interval. We here determine the origin of EIT in experiments and show that characteristic EIT structures can be detected across an unexpectedly wide range of parameters. Close to onset, a pattern of chevron-shaped streaks emerges in qualitative agreement with linear and weakly nonlinear theory. However, in experiments, the dynamics remain weakly chaotic, and the instability can be traced to far lower Reynolds numbers than permitted by theory. For increasing inertia, the flow undergoes a transformation to a wall mode composed of inclined near-wall streaks and shear layers. This mode persists to what is known as the “maximum drag reduction limit,” and overall EIT is found to dominate viscoelastic flows across more than three orders of magnitude in Reynolds number."}],"publication_identifier":{"issn":["0027-8424"],"eissn":["1091-6490"]},"language":[{"iso":"eng"}],"corr_author":"1","title":"Experimental observation of the origin and structure of elastoinertial turbulence","day":"03","year":"2021","scopus_import":"1","article_type":"original","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","date_published":"2021-11-03T00:00:00Z","month":"11","date_created":"2021-11-17T13:24:24Z","publication":"Proceedings of the National Academy of Sciences of the United States of America","date_updated":"2026-06-07T22:30:25Z","citation":{"ieee":"G. H. Choueiri, J. M. Lopez Alonso, A. Varshney, S. Sankar, and B. Hof, “Experimental observation of the origin and structure of elastoinertial turbulence,” <i>Proceedings of the National Academy of Sciences of the United States of America</i>, vol. 118, no. 45. National Academy of Sciences, 2021.","ista":"Choueiri GH, Lopez Alonso JM, Varshney A, Sankar S, Hof B. 2021. Experimental observation of the origin and structure of elastoinertial turbulence. Proceedings of the National Academy of Sciences of the United States of America. 118(45), e2102350118.","mla":"Choueiri, George H., et al. “Experimental Observation of the Origin and Structure of Elastoinertial Turbulence.” <i>Proceedings of the National Academy of Sciences of the United States of America</i>, vol. 118, no. 45, e2102350118, National Academy of Sciences, 2021, doi:<a href=\"https://doi.org/10.1073/pnas.2102350118\">10.1073/pnas.2102350118</a>.","apa":"Choueiri, G. H., Lopez Alonso, J. M., Varshney, A., Sankar, S., &#38; Hof, B. (2021). Experimental observation of the origin and structure of elastoinertial turbulence. <i>Proceedings of the National Academy of Sciences of the United States of America</i>. National Academy of Sciences. <a href=\"https://doi.org/10.1073/pnas.2102350118\">https://doi.org/10.1073/pnas.2102350118</a>","ama":"Choueiri GH, Lopez Alonso JM, Varshney A, Sankar S, Hof B. Experimental observation of the origin and structure of elastoinertial turbulence. <i>Proceedings of the National Academy of Sciences of the United States of America</i>. 2021;118(45). doi:<a href=\"https://doi.org/10.1073/pnas.2102350118\">10.1073/pnas.2102350118</a>","short":"G.H. Choueiri, J.M. Lopez Alonso, A. Varshney, S. Sankar, B. Hof, Proceedings of the National Academy of Sciences of the United States of America 118 (2021).","chicago":"Choueiri, George H, Jose M Lopez Alonso, Atul Varshney, Sarath Sankar, and Björn Hof. “Experimental Observation of the Origin and Structure of Elastoinertial Turbulence.” <i>Proceedings of the National Academy of Sciences of the United States of America</i>. National Academy of Sciences, 2021. <a href=\"https://doi.org/10.1073/pnas.2102350118\">https://doi.org/10.1073/pnas.2102350118</a>."},"department":[{"_id":"BjHo"}],"project":[{"name":"Instabilities in pulsating pipe flow in complex fluids","call_identifier":"FWF","_id":"238B8092-32DE-11EA-91FC-C7463DDC885E","grant_number":"I04188"}],"volume":118,"_id":"10299","oa_version":"Preprint","oa":1,"publisher":"National Academy of Sciences","external_id":{"pmid":[" 34732570"],"isi":["000720926900019"],"arxiv":["2103.00023"]},"arxiv":1,"status":"public","issue":"45","acknowledgement":"We thank Y. Dubief, R. Kerswell, E. Marensi, V. Shankar, V. Steinberg, and V. Terrapon for discussions and helpful comments. A.V. and B.H. acknowledge funding from the Austrian Science Fund, grant I4188-N30, within the Deutsche Forschungsgemeinschaft research unit FOR 2688.","isi":1,"intvolume":"       118","doi":"10.1073/pnas.2102350118","author":[{"last_name":"Choueiri","id":"448BD5BC-F248-11E8-B48F-1D18A9856A87","first_name":"George H","full_name":"Choueiri, George H"},{"last_name":"Lopez Alonso","first_name":"Jose M","id":"40770848-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-0384-2022","full_name":"Lopez Alonso, Jose M"},{"orcid":"0000-0002-3072-5999","full_name":"Varshney, Atul","first_name":"Atul","id":"2A2006B2-F248-11E8-B48F-1D18A9856A87","last_name":"Varshney"},{"full_name":"Sankar, Sarath","first_name":"Sarath","last_name":"Sankar"},{"id":"3A374330-F248-11E8-B48F-1D18A9856A87","first_name":"Björn","full_name":"Hof, Björn","orcid":"0000-0003-2057-2754","last_name":"Hof"}],"publication_status":"published","type":"journal_article","related_material":{"record":[{"id":"19906","status":"public","relation":"dissertation_contains"}]},"article_number":"e2102350118","article_processing_charge":"No","quality_controlled":"1","pmid":1},{"keyword":["Drag Reduction","Transition to Turbulence","Multiphase Flows","particle Laden Flows","Complex Flows","Experiments","Fluid Dynamics"],"tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","short":"CC BY (4.0)","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"},"degree_awarded":"PhD","file":[{"embargo_to":"open_access","date_updated":"2022-07-29T22:30:05Z","file_size":22859658,"relation":"source_file","date_created":"2021-07-28T13:32:02Z","access_level":"closed","checksum":"77436be3563a90435024307b1b5ee7e8","creator":"nagrawal","file_name":"Transition to Turbulence and Drag Reduction in Particle-Laden Pipe Flows.zip","content_type":"application/x-zip-compressed","file_id":"9744"},{"file_name":"Transition to Turbulence and Drag Reduction in Particle-Laden Pipe Flows.pdf","creator":"nagrawal","checksum":"72a891d7daba85445c29b868c22575ed","embargo":"2022-07-28","file_id":"9745","content_type":"application/pdf","date_created":"2021-07-28T13:32:05Z","access_level":"open_access","relation":"main_file","file_size":18658048,"date_updated":"2022-07-29T22:30:05Z"}],"abstract":[{"lang":"eng","text":"Most real-world flows are multiphase, yet we know little about them compared to their single-phase counterparts. Multiphase flows are more difficult to investigate as their dynamics occur in large parameter space and involve complex phenomena such as preferential concentration, turbulence modulation, non-Newtonian rheology, etc. Over the last few decades, experiments in particle-laden flows have taken a back seat in favour of ever-improving computational resources. However, computers are still not powerful enough to simulate a real-world fluid with millions of finite-size particles. Experiments are essential not only because they offer a reliable way to investigate real-world multiphase flows but also because they serve to validate numerical studies and steer the research in a relevant direction. In this work, we have experimentally investigated particle-laden flows in pipes, and in particular, examined the effect of particles on the laminar-turbulent transition and the drag scaling in turbulent flows.\r\n\r\nFor particle-laden pipe flows, an earlier study [Matas et al., 2003] reported how the sub-critical (i.e., hysteretic) transition that occurs via localised turbulent structures called puffs is affected by the addition of particles. In this study, in addition to this known transition, we found a super-critical transition to a globally fluctuating state with increasing particle concentration. At the same time, the Newtonian-type transition via puffs is delayed to larger Reynolds numbers. At an even higher concentration, only the globally fluctuating state is found. The dynamics of particle-laden flows are hence determined by two competing instabilities that give rise to three flow regimes: Newtonian-type turbulence at low, a particle-induced globally fluctuating state at high, and a coexistence state at intermediate concentrations.\r\n\r\nThe effect of particles on turbulent drag is ambiguous, with studies reporting drag reduction, no net change, and even drag increase. The ambiguity arises because, in addition to particle concentration, particle shape, size, and density also affect the net drag. Even similar particles might affect the flow dissimilarly in different Reynolds number and concentration ranges. In the present study, we explored a wide range of both Reynolds number and concentration, using spherical as well as cylindrical particles. We found that the spherical particles do not reduce drag while the cylindrical particles are drag-reducing within a specific Reynolds number interval. The interval strongly depends on the particle concentration and the relative size of the pipe and particles. Within this interval, the magnitude of drag reduction reaches a maximum. These drag reduction maxima appear to fall onto a distinct power-law curve irrespective of the pipe diameter and particle concentration, and this curve can be considered as the maximum drag reduction asymptote for a given fibre shape. Such an asymptote is well known for polymeric flows but had not been identified for particle-laden flows prior to this work."}],"publication_identifier":{"issn":["2663-337X"]},"alternative_title":["ISTA Thesis"],"language":[{"iso":"eng"}],"corr_author":"1","title":"Transition to turbulence and drag reduction in particle-laden pipe flows","day":"29","year":"2021","user_id":"ba8df636-2132-11f1-aed0-ed93e2281fdd","date_published":"2021-07-29T00:00:00Z","month":"07","ddc":["532"],"page":"118","date_created":"2021-07-27T13:40:30Z","date_updated":"2026-04-16T08:43:20Z","department":[{"_id":"GradSch"},{"_id":"BjHo"}],"citation":{"short":"N. Agrawal, Transition to Turbulence and Drag Reduction in Particle-Laden Pipe Flows, Institute of Science and Technology Austria, 2021.","ama":"Agrawal N. Transition to turbulence and drag reduction in particle-laden pipe flows. 2021. doi:<a href=\"https://doi.org/10.15479/at:ista:9728\">10.15479/at:ista:9728</a>","apa":"Agrawal, N. (2021). <i>Transition to turbulence and drag reduction in particle-laden pipe flows</i>. Institute of Science and Technology Austria. <a href=\"https://doi.org/10.15479/at:ista:9728\">https://doi.org/10.15479/at:ista:9728</a>","chicago":"Agrawal, Nishchal. “Transition to Turbulence and Drag Reduction in Particle-Laden Pipe Flows.” Institute of Science and Technology Austria, 2021. <a href=\"https://doi.org/10.15479/at:ista:9728\">https://doi.org/10.15479/at:ista:9728</a>.","ieee":"N. Agrawal, “Transition to turbulence and drag reduction in particle-laden pipe flows,” Institute of Science and Technology Austria, 2021.","mla":"Agrawal, Nishchal. <i>Transition to Turbulence and Drag Reduction in Particle-Laden Pipe Flows</i>. Institute of Science and Technology Austria, 2021, doi:<a href=\"https://doi.org/10.15479/at:ista:9728\">10.15479/at:ista:9728</a>.","ista":"Agrawal N. 2021. Transition to turbulence and drag reduction in particle-laden pipe flows. Institute of Science and Technology Austria."},"file_date_updated":"2022-07-29T22:30:05Z","_id":"9728","oa_version":"Published Version","oa":1,"publisher":"Institute of Science and Technology Austria","acknowledged_ssus":[{"_id":"M-Shop"}],"has_accepted_license":"1","status":"public","doi":"10.15479/at:ista:9728","publication_status":"published","author":[{"last_name":"Agrawal","id":"469E6004-F248-11E8-B48F-1D18A9856A87","first_name":"Nishchal","full_name":"Agrawal, Nishchal"}],"type":"dissertation","OA_place":"publisher","related_material":{"record":[{"relation":"part_of_dissertation","status":"public","id":"6189"}]},"supervisor":[{"last_name":"Hof","full_name":"Hof, Björn","orcid":"0000-0003-2057-2754","first_name":"Björn","id":"3A374330-F248-11E8-B48F-1D18A9856A87"}],"article_processing_charge":"No"},{"title":"Oblique stripe solutions of channel flow","day":"25","year":"2020","scopus_import":"1","article_type":"original","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","date_published":"2020-08-25T00:00:00Z","month":"08","ddc":["530"],"date_created":"2020-06-29T07:59:35Z","date_updated":"2025-07-10T11:55:03Z","publication":"Journal of Fluid Mechanics","tmp":{"name":"Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)","legal_code_url":"https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode","short":"CC BY-NC-SA (4.0)","image":"/images/cc_by_nc_sa.png"},"file":[{"access_level":"open_access","date_created":"2020-06-30T08:37:37Z","relation":"main_file","date_updated":"2020-07-14T12:48:08Z","file_size":767873,"file_id":"8070","content_type":"application/pdf","creator":"cziletti","checksum":"3f487bf6d9286787096306eaa18702e8","file_name":"2020_JournalOfFluidMech_Paranjape.pdf"}],"abstract":[{"text":"With decreasing Reynolds number, Re, turbulence in channel flow becomes spatio-temporally intermittent and self-organises into solitary stripes oblique to the mean flow direction. We report here the existence of localised nonlinear travelling wave solutions of the Navier–Stokes equations possessing this obliqueness property. Such solutions are identified numerically using edge tracking coupled with arclength continuation. All solutions emerge in saddle-node bifurcations at values of Re lower than the non-localised solutions. Relative periodic orbit solutions bifurcating from branches of travelling waves have also been computed. A complete parametric study is performed, including their stability, the investigation of their large-scale flow, and the robustness to changes of the numerical domain.","lang":"eng"}],"publication_identifier":{"eissn":["1469-7645"],"issn":["0022-1120"]},"language":[{"iso":"eng"}],"corr_author":"1","status":"public","has_accepted_license":"1","acknowledgement":"The authors thank S. Zammert and B. Budanur for useful discussions. J. F. Gibson is gratefully acknowledged for the development and the maintenance of the code Channelflow. Y.D. would like to thank P. Schlatter and D. S. Henningson for an early collaboration on a similar topic in the case of plane Couette flow during the years 2008–2013.","isi":1,"intvolume":"       897","doi":"10.1017/jfm.2020.322","author":[{"last_name":"Paranjape","first_name":"Chaitanya S","id":"3D85B7C4-F248-11E8-B48F-1D18A9856A87","full_name":"Paranjape, Chaitanya S"},{"full_name":"Duguet, Yohann","first_name":"Yohann","last_name":"Duguet"},{"last_name":"Hof","full_name":"Hof, Björn","orcid":"0000-0003-2057-2754","id":"3A374330-F248-11E8-B48F-1D18A9856A87","first_name":"Björn"}],"publication_status":"published","type":"journal_article","article_number":"A7","article_processing_charge":"Yes (via OA deal)","quality_controlled":"1","citation":{"short":"C.S. Paranjape, Y. Duguet, B. Hof, Journal of Fluid Mechanics 897 (2020).","apa":"Paranjape, C. S., Duguet, Y., &#38; Hof, B. (2020). Oblique stripe solutions of channel flow. <i>Journal of Fluid Mechanics</i>. Cambridge University Press. <a href=\"https://doi.org/10.1017/jfm.2020.322\">https://doi.org/10.1017/jfm.2020.322</a>","ama":"Paranjape CS, Duguet Y, Hof B. Oblique stripe solutions of channel flow. <i>Journal of Fluid Mechanics</i>. 2020;897. doi:<a href=\"https://doi.org/10.1017/jfm.2020.322\">10.1017/jfm.2020.322</a>","chicago":"Paranjape, Chaitanya S, Yohann Duguet, and Björn Hof. “Oblique Stripe Solutions of Channel Flow.” <i>Journal of Fluid Mechanics</i>. Cambridge University Press, 2020. <a href=\"https://doi.org/10.1017/jfm.2020.322\">https://doi.org/10.1017/jfm.2020.322</a>.","ieee":"C. S. Paranjape, Y. Duguet, and B. Hof, “Oblique stripe solutions of channel flow,” <i>Journal of Fluid Mechanics</i>, vol. 897. Cambridge University Press, 2020.","mla":"Paranjape, Chaitanya S., et al. “Oblique Stripe Solutions of Channel Flow.” <i>Journal of Fluid Mechanics</i>, vol. 897, A7, Cambridge University Press, 2020, doi:<a href=\"https://doi.org/10.1017/jfm.2020.322\">10.1017/jfm.2020.322</a>.","ista":"Paranjape CS, Duguet Y, Hof B. 2020. Oblique stripe solutions of channel flow. Journal of Fluid Mechanics. 897, A7."},"department":[{"_id":"BjHo"}],"file_date_updated":"2020-07-14T12:48:08Z","volume":897,"oa":1,"_id":"8043","oa_version":"Published Version","publisher":"Cambridge University Press","external_id":{"isi":["000539132300001"]}},{"language":[{"iso":"eng"}],"main_file_link":[{"url":"https://arxiv.org/abs/2008.02367","open_access":"1"}],"abstract":[{"text":"In laboratory studies and numerical simulations, we observe clear signatures of unstable time-periodic solutions in a moderately turbulent quasi-two-dimensional flow. We validate the dynamical relevance of such solutions by demonstrating that turbulent flows in both experiment and numerics transiently display time-periodic dynamics when they shadow unstable periodic orbits (UPOs). We show that UPOs we computed are also statistically significant, with turbulent flows spending a sizable fraction of the total time near these solutions. As a result, the average rates of energy input and dissipation for the turbulent flow and frequently visited UPOs differ only by a few percent.","lang":"eng"}],"publication_identifier":{"issn":["0031-9007"],"eissn":["1079-7114"]},"keyword":["General Physics and Astronomy"],"date_created":"2020-10-08T17:27:32Z","date_updated":"2025-04-15T06:50:02Z","publication":"Physical Review Letters","date_published":"2020-08-05T00:00:00Z","ec_funded":1,"month":"08","year":"2020","scopus_import":"1","article_type":"original","user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","title":"Capturing turbulent dynamics and statistics in experiments with unstable periodic orbits","day":"05","arxiv":1,"publisher":"American Physical Society","external_id":{"isi":["000555785600005"],"arxiv":["2008.02367"]},"volume":125,"_id":"8634","oa_version":"Preprint","oa":1,"department":[{"_id":"BjHo"}],"citation":{"chicago":"Suri, Balachandra, Logan Kageorge, Roman O. Grigoriev, and Michael F. Schatz. “Capturing Turbulent Dynamics and Statistics in Experiments with Unstable Periodic Orbits.” <i>Physical Review Letters</i>. American Physical Society, 2020. <a href=\"https://doi.org/10.1103/physrevlett.125.064501\">https://doi.org/10.1103/physrevlett.125.064501</a>.","short":"B. Suri, L. Kageorge, R.O. Grigoriev, M.F. Schatz, Physical Review Letters 125 (2020).","ama":"Suri B, Kageorge L, Grigoriev RO, Schatz MF. Capturing turbulent dynamics and statistics in experiments with unstable periodic orbits. <i>Physical Review Letters</i>. 2020;125(6). doi:<a href=\"https://doi.org/10.1103/physrevlett.125.064501\">10.1103/physrevlett.125.064501</a>","apa":"Suri, B., Kageorge, L., Grigoriev, R. O., &#38; Schatz, M. F. (2020). Capturing turbulent dynamics and statistics in experiments with unstable periodic orbits. <i>Physical Review Letters</i>. American Physical Society. <a href=\"https://doi.org/10.1103/physrevlett.125.064501\">https://doi.org/10.1103/physrevlett.125.064501</a>","mla":"Suri, Balachandra, et al. “Capturing Turbulent Dynamics and Statistics in Experiments with Unstable Periodic Orbits.” <i>Physical Review Letters</i>, vol. 125, no. 6, 064501, American Physical Society, 2020, doi:<a href=\"https://doi.org/10.1103/physrevlett.125.064501\">10.1103/physrevlett.125.064501</a>.","ista":"Suri B, Kageorge L, Grigoriev RO, Schatz MF. 2020. Capturing turbulent dynamics and statistics in experiments with unstable periodic orbits. Physical Review Letters. 125(6), 064501.","ieee":"B. Suri, L. Kageorge, R. O. Grigoriev, and M. F. Schatz, “Capturing turbulent dynamics and statistics in experiments with unstable periodic orbits,” <i>Physical Review Letters</i>, vol. 125, no. 6. American Physical Society, 2020."},"project":[{"grant_number":"291734","_id":"25681D80-B435-11E9-9278-68D0E5697425","name":"International IST Postdoc Fellowship Programme","call_identifier":"FP7"}],"article_number":"064501","article_processing_charge":"No","quality_controlled":"1","author":[{"full_name":"Suri, Balachandra","id":"47A5E706-F248-11E8-B48F-1D18A9856A87","first_name":"Balachandra","last_name":"Suri"},{"full_name":"Kageorge, Logan","first_name":"Logan","last_name":"Kageorge"},{"full_name":"Grigoriev, Roman O.","first_name":"Roman O.","last_name":"Grigoriev"},{"full_name":"Schatz, Michael F.","first_name":"Michael F.","last_name":"Schatz"}],"publication_status":"published","type":"journal_article","isi":1,"intvolume":"       125","doi":"10.1103/physrevlett.125.064501","acknowledgement":"M. F. S. and R. O. G. acknowledge funding from the National Science Foundation (CMMI-1234436, DMS1125302, CMMI-1725587) and Defense Advanced Research Projects Agency (HR0011-16-2-0033). B. S.has received funding from the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme FP7/2007–2013/ under REA Grant Agreement No. 291734.","status":"public","issue":"6"},{"article_number":"023903","article_processing_charge":"No","quality_controlled":"1","author":[{"last_name":"Budanur","id":"3EA1010E-F248-11E8-B48F-1D18A9856A87","first_name":"Nazmi B","full_name":"Budanur, Nazmi B","orcid":"0000-0003-0423-5010"},{"first_name":"Elena","full_name":"Marensi, Elena","last_name":"Marensi"},{"first_name":"Ashley P.","full_name":"Willis, Ashley P.","last_name":"Willis"},{"last_name":"Hof","id":"3A374330-F248-11E8-B48F-1D18A9856A87","first_name":"Björn","orcid":"0000-0003-2057-2754","full_name":"Hof, Björn"}],"publication_status":"published","type":"journal_article","isi":1,"intvolume":"         5","doi":"10.1103/physrevfluids.5.023903","status":"public","issue":"2","arxiv":1,"publisher":"American Physical Society","external_id":{"isi":["000515065100001"],"arxiv":["1912.09270"]},"volume":5,"oa":1,"_id":"7534","oa_version":"Preprint","citation":{"ieee":"N. B. Budanur, E. Marensi, A. P. Willis, and B. Hof, “Upper edge of chaos and the energetics of transition in pipe flow,” <i>Physical Review Fluids</i>, vol. 5, no. 2. American Physical Society, 2020.","ista":"Budanur NB, Marensi E, Willis AP, Hof B. 2020. Upper edge of chaos and the energetics of transition in pipe flow. Physical Review Fluids. 5(2), 023903.","mla":"Budanur, Nazmi B., et al. “Upper Edge of Chaos and the Energetics of Transition in Pipe Flow.” <i>Physical Review Fluids</i>, vol. 5, no. 2, 023903, American Physical Society, 2020, doi:<a href=\"https://doi.org/10.1103/physrevfluids.5.023903\">10.1103/physrevfluids.5.023903</a>.","short":"N.B. Budanur, E. Marensi, A.P. Willis, B. Hof, Physical Review Fluids 5 (2020).","ama":"Budanur NB, Marensi E, Willis AP, Hof B. Upper edge of chaos and the energetics of transition in pipe flow. <i>Physical Review Fluids</i>. 2020;5(2). doi:<a href=\"https://doi.org/10.1103/physrevfluids.5.023903\">10.1103/physrevfluids.5.023903</a>","apa":"Budanur, N. B., Marensi, E., Willis, A. P., &#38; Hof, B. (2020). Upper edge of chaos and the energetics of transition in pipe flow. <i>Physical Review Fluids</i>. American Physical Society. <a href=\"https://doi.org/10.1103/physrevfluids.5.023903\">https://doi.org/10.1103/physrevfluids.5.023903</a>","chicago":"Budanur, Nazmi B, Elena Marensi, Ashley P. Willis, and Björn Hof. “Upper Edge of Chaos and the Energetics of Transition in Pipe Flow.” <i>Physical Review Fluids</i>. American Physical Society, 2020. <a href=\"https://doi.org/10.1103/physrevfluids.5.023903\">https://doi.org/10.1103/physrevfluids.5.023903</a>."},"department":[{"_id":"BjHo"}],"date_created":"2020-02-27T10:26:57Z","publication":"Physical Review Fluids","date_updated":"2023-08-18T06:44:46Z","date_published":"2020-02-21T00:00:00Z","month":"02","scopus_import":"1","year":"2020","article_type":"original","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","title":"Upper edge of chaos and the energetics of transition in pipe flow","day":"21","language":[{"iso":"eng"}],"main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/1912.09270"}],"abstract":[{"text":"In the past two decades, our understanding of the transition to turbulence in shear flows with linearly stable laminar solutions has greatly improved. Regarding the susceptibility of the laminar flow, two concepts have been particularly useful: the edge states and the minimal seeds. In this nonlinear picture of the transition, the basin boundary of turbulence is set by the edge state's stable manifold and this manifold comes closest in energy to the laminar equilibrium at the minimal seed. We begin this paper by presenting numerical experiments in which three-dimensional perturbations are too energetic to trigger turbulence in pipe flow but they do lead to turbulence when their amplitude is reduced. We show that this seemingly counterintuitive observation is in fact consistent with the fully nonlinear description of the transition mediated by the edge state. In order to understand the physical mechanisms behind this process, we measure the turbulent kinetic energy production and dissipation rates as a function of the radial coordinate. Our main observation is that the transition to turbulence relies on the energy amplification away from the wall, as opposed to the turbulence itself, whose energy is predominantly produced near the wall. This observation is further supported by the similar analyses on the minimal seeds and the edge states. Furthermore, we show that the time evolution of production-over-dissipation curves provides a clear distinction between the different initial amplification stages of the transition to turbulence from the minimal seed.","lang":"eng"}],"publication_identifier":{"issn":["2469-990X"]}},{"arxiv":1,"external_id":{"isi":["000552271200011"],"arxiv":["1908.00587"]},"publisher":"Elsevier","_id":"7364","oa":1,"oa_version":"Published Version","volume":11,"file_date_updated":"2020-07-14T12:47:56Z","department":[{"_id":"BjHo"}],"citation":{"ama":"Lopez Alonso JM, Feldmann D, Rampp M, Vela-Martín A, Shi L, Avila M. nsCouette – A high-performance code for direct numerical simulations of turbulent Taylor–Couette flow. <i>SoftwareX</i>. 2020;11. doi:<a href=\"https://doi.org/10.1016/j.softx.2019.100395\">10.1016/j.softx.2019.100395</a>","apa":"Lopez Alonso, J. M., Feldmann, D., Rampp, M., Vela-Martín, A., Shi, L., &#38; Avila, M. (2020). nsCouette – A high-performance code for direct numerical simulations of turbulent Taylor–Couette flow. <i>SoftwareX</i>. Elsevier. <a href=\"https://doi.org/10.1016/j.softx.2019.100395\">https://doi.org/10.1016/j.softx.2019.100395</a>","short":"J.M. Lopez Alonso, D. Feldmann, M. Rampp, A. Vela-Martín, L. Shi, M. Avila, SoftwareX 11 (2020).","chicago":"Lopez Alonso, Jose M, Daniel Feldmann, Markus Rampp, Alberto Vela-Martín, Liang Shi, and Marc Avila. “NsCouette – A High-Performance Code for Direct Numerical Simulations of Turbulent Taylor–Couette Flow.” <i>SoftwareX</i>. Elsevier, 2020. <a href=\"https://doi.org/10.1016/j.softx.2019.100395\">https://doi.org/10.1016/j.softx.2019.100395</a>.","ieee":"J. M. Lopez Alonso, D. Feldmann, M. Rampp, A. Vela-Martín, L. Shi, and M. Avila, “nsCouette – A high-performance code for direct numerical simulations of turbulent Taylor–Couette flow,” <i>SoftwareX</i>, vol. 11. Elsevier, 2020.","mla":"Lopez Alonso, Jose M., et al. “NsCouette – A High-Performance Code for Direct Numerical Simulations of Turbulent Taylor–Couette Flow.” <i>SoftwareX</i>, vol. 11, 100395, Elsevier, 2020, doi:<a href=\"https://doi.org/10.1016/j.softx.2019.100395\">10.1016/j.softx.2019.100395</a>.","ista":"Lopez Alonso JM, Feldmann D, Rampp M, Vela-Martín A, Shi L, Avila M. 2020. nsCouette – A high-performance code for direct numerical simulations of turbulent Taylor–Couette flow. SoftwareX. 11, 100395."},"quality_controlled":"1","article_processing_charge":"No","article_number":"100395","type":"journal_article","author":[{"full_name":"Lopez Alonso, Jose M","orcid":"0000-0002-0384-2022","first_name":"Jose M","id":"40770848-F248-11E8-B48F-1D18A9856A87","last_name":"Lopez Alonso"},{"full_name":"Feldmann, Daniel","first_name":"Daniel","last_name":"Feldmann"},{"last_name":"Rampp","full_name":"Rampp, Markus","first_name":"Markus"},{"last_name":"Vela-Martín","full_name":"Vela-Martín, Alberto","first_name":"Alberto"},{"last_name":"Shi","first_name":"Liang","id":"374A3F1A-F248-11E8-B48F-1D18A9856A87","full_name":"Shi, Liang"},{"full_name":"Avila, Marc","first_name":"Marc","last_name":"Avila"}],"publication_status":"published","doi":"10.1016/j.softx.2019.100395","intvolume":"        11","isi":1,"has_accepted_license":"1","status":"public","corr_author":"1","language":[{"iso":"eng"}],"abstract":[{"text":"We present nsCouette, a highly scalable software tool to solve the Navier–Stokes equations for incompressible fluid flow between differentially heated and independently rotating, concentric cylinders. It is based on a pseudospectral spatial discretization and dynamic time-stepping. It is implemented in modern Fortran with a hybrid MPI-OpenMP parallelization scheme and thus designed to compute turbulent flows at high Reynolds and Rayleigh numbers. An additional GPU implementation (C-CUDA) for intermediate problem sizes and a version for pipe flow (nsPipe) are also provided.","lang":"eng"}],"publication_identifier":{"eissn":["2352-7110"]},"file":[{"relation":"main_file","file_size":679707,"date_updated":"2020-07-14T12:47:56Z","date_created":"2020-01-27T07:32:46Z","access_level":"open_access","file_name":"2020_SoftwareX_Lopez.pdf","checksum":"2af1a1a3cc33557b345145276f221668","creator":"dernst","content_type":"application/pdf","file_id":"7365"}],"tmp":{"name":"Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)","image":"/images/cc_by_nc_nd.png","short":"CC BY-NC-ND (4.0)","legal_code_url":"https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode"},"date_updated":"2026-04-02T14:16:50Z","publication":"SoftwareX","date_created":"2020-01-26T23:00:35Z","ddc":["000"],"month":"01","date_published":"2020-01-17T00:00:00Z","user_id":"ba8df636-2132-11f1-aed0-ed93e2281fdd","year":"2020","article_type":"original","scopus_import":"1","day":"17","title":"nsCouette – A high-performance code for direct numerical simulations of turbulent Taylor–Couette flow"},{"arxiv":1,"external_id":{"isi":["000519254800002"],"arxiv":["1910.04584"]},"publisher":"AIP Publishing","volume":30,"oa_version":"Published Version","_id":"7563","oa":1,"citation":{"chicago":"Yalniz, Gökhan, and Nazmi B Budanur. “Inferring Symbolic Dynamics of Chaotic Flows from Persistence.” <i>Chaos</i>. AIP Publishing, 2020. <a href=\"https://doi.org/10.1063/1.5122969\">https://doi.org/10.1063/1.5122969</a>.","apa":"Yalniz, G., &#38; Budanur, N. B. (2020). Inferring symbolic dynamics of chaotic flows from persistence. <i>Chaos</i>. AIP Publishing. <a href=\"https://doi.org/10.1063/1.5122969\">https://doi.org/10.1063/1.5122969</a>","ama":"Yalniz G, Budanur NB. Inferring symbolic dynamics of chaotic flows from persistence. <i>Chaos</i>. 2020;30(3). doi:<a href=\"https://doi.org/10.1063/1.5122969\">10.1063/1.5122969</a>","short":"G. Yalniz, N.B. Budanur, Chaos 30 (2020).","ista":"Yalniz G, Budanur NB. 2020. Inferring symbolic dynamics of chaotic flows from persistence. Chaos. 30(3), 033109.","mla":"Yalniz, Gökhan, and Nazmi B. Budanur. “Inferring Symbolic Dynamics of Chaotic Flows from Persistence.” <i>Chaos</i>, vol. 30, no. 3, 033109, AIP Publishing, 2020, doi:<a href=\"https://doi.org/10.1063/1.5122969\">10.1063/1.5122969</a>.","ieee":"G. Yalniz and N. B. Budanur, “Inferring symbolic dynamics of chaotic flows from persistence,” <i>Chaos</i>, vol. 30, no. 3. AIP Publishing, 2020."},"department":[{"_id":"BjHo"}],"article_number":"033109","related_material":{"record":[{"relation":"dissertation_contains","status":"public","id":"19684"}]},"article_processing_charge":"No","quality_controlled":"1","author":[{"id":"66E74FA2-D8BF-11E9-8249-8DE2E5697425","first_name":"Gökhan","orcid":"0000-0002-8490-9312","full_name":"Yalniz, Gökhan","last_name":"Yalniz"},{"first_name":"Nazmi B","id":"3EA1010E-F248-11E8-B48F-1D18A9856A87","full_name":"Budanur, Nazmi B","orcid":"0000-0003-0423-5010","last_name":"Budanur"}],"publication_status":"published","type":"journal_article","isi":1,"doi":"10.1063/1.5122969","intvolume":"        30","status":"public","issue":"3","language":[{"iso":"eng"}],"corr_author":"1","main_file_link":[{"url":"https://doi.org/10.1063/1.5122969","open_access":"1"}],"abstract":[{"lang":"eng","text":"We introduce “state space persistence analysis” for deducing the symbolic dynamics of time series data obtained from high-dimensional chaotic attractors. To this end, we adapt a topological data analysis technique known as persistent homology for the characterization of state space projections of chaotic trajectories and periodic orbits. By comparing the shapes along a chaotic trajectory to those of the periodic orbits, state space persistence analysis quantifies the shape similarity of chaotic trajectory segments and periodic orbits. We demonstrate the method by applying it to the three-dimensional Rössler system and a 30-dimensional discretization of the Kuramoto–Sivashinsky partial differential equation in (1+1) dimensions.\r\nOne way of studying chaotic attractors systematically is through their symbolic dynamics, in which one partitions the state space into qualitatively different regions and assigns a symbol to each such region.1–3 This yields a “coarse-grained” state space of the system, which can then be reduced to a Markov chain encoding all possible transitions between the states of the system. While it is possible to obtain the symbolic dynamics of low-dimensional chaotic systems with standard tools such as Poincaré maps, when applied to high-dimensional systems such as turbulent flows, these tools alone are not sufficient to determine symbolic dynamics.4,5 In this paper, we develop “state space persistence analysis” and demonstrate that it can be utilized to infer the symbolic dynamics in very high-dimensional settings."}],"publication_identifier":{"eissn":["1089-7682"],"issn":["1054-1500"]},"date_updated":"2026-04-07T11:47:05Z","publication":"Chaos","date_created":"2020-03-04T08:06:25Z","date_published":"2020-03-03T00:00:00Z","month":"03","article_type":"original","year":"2020","scopus_import":"1","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","title":"Inferring symbolic dynamics of chaotic flows from persistence","day":"03"}]