{"month":"11","doi":"10.1073/pnas.2102350118","publication_identifier":{"eissn":["1091-6490"],"issn":["0027-8424"]},"publication":"Proceedings of the National Academy of Sciences","quality_controlled":"1","article_number":"e2102350118","date_published":"2021-11-03T00:00:00Z","department":[{"_id":"BjHo"}],"intvolume":"       118","date_updated":"2023-08-14T11:50:10Z","scopus_import":"1","article_processing_charge":"No","volume":118,"keyword":["multidisciplinary","elastoinertial turbulence","viscoelastic flows","elastic instability","drag reduction"],"day":"03","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","article_type":"original","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."}],"oa":1,"publisher":"National Academy of Sciences","oa_version":"Preprint","author":[{"id":"448BD5BC-F248-11E8-B48F-1D18A9856A87","full_name":"Choueiri, George H","first_name":"George H","last_name":"Choueiri"},{"id":"40770848-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-0384-2022","full_name":"Lopez Alonso, Jose M","first_name":"Jose M","last_name":"Lopez Alonso"},{"id":"2A2006B2-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-3072-5999","full_name":"Varshney, Atul","first_name":"Atul","last_name":"Varshney"},{"last_name":"Sankar","first_name":"Sarath","full_name":"Sankar, Sarath"},{"first_name":"Björn","last_name":"Hof","full_name":"Hof, Björn","orcid":"0000-0003-2057-2754","id":"3A374330-F248-11E8-B48F-1D18A9856A87"}],"main_file_link":[{"url":"https://arxiv.org/abs/2103.00023","open_access":"1"}],"publication_status":"published","language":[{"iso":"eng"}],"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.","project":[{"name":"Instabilities in pulsating pipe flow of Newtonian and complex fluids","call_identifier":"FWF","_id":"238B8092-32DE-11EA-91FC-C7463DDC885E","grant_number":"I04188"}],"_id":"10299","date_created":"2021-11-17T13:24:24Z","pmid":1,"status":"public","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</i>, vol. 118, no. 45. National Academy of Sciences, 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</i>. National Academy of Sciences, 2021. <a href=\"https://doi.org/10.1073/pnas.2102350118\">https://doi.org/10.1073/pnas.2102350118</a>.","mla":"Choueiri, George H., et al. “Experimental Observation of the Origin and Structure of Elastoinertial Turbulence.” <i>Proceedings of the National Academy of Sciences</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>.","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. 118(45), e2102350118.","short":"G.H. Choueiri, J.M. Lopez Alonso, A. Varshney, S. Sankar, B. Hof, Proceedings of the National Academy of Sciences 118 (2021).","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</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</i>. 2021;118(45). doi:<a href=\"https://doi.org/10.1073/pnas.2102350118\">10.1073/pnas.2102350118</a>"},"title":"Experimental observation of the origin and structure of elastoinertial turbulence","type":"journal_article","year":"2021","external_id":{"pmid":[" 34732570"],"arxiv":["2103.00023"],"isi":["000720926900019"]},"isi":1}