---
DOAJ_listed: '1'
OA_place: publisher
OA_type: gold
PlanS_conform: '1'
_id: '21013'
abstract:
- lang: eng
text: We have addressed convective self‐aggregation (CSA) in steady and oscillating
sea surface temperature (SST) and solar radiation (SOLIN) cloud‐resolving model
simulations in a non‐rotating radiative‐convective equilibrium (RCE) framework.
Our experiment designs are motivated by land‐ocean heterogeneity of atmospheric
convection. The steady and oscillating forcings are idealizations of ocean and
land conditions, respectively, based on their differences in heat capacities.
In both kinds of simulations, the diurnal mean SST and SOLIN are the same, and
both SST and SOLIN are only varied in time (i.e., they are spatially homogeneous
at any given time). We find that diurnally oscillating forcing accelerates CSA.
Stronger long‐wave cooling in dry regions at night and during the warm SST phase
(late afternoon) both allow the long‐wave feedback, known to favor aggregation,
to intensify compared to steady forcing simulations. In addition to the long‐wave,
reduced short‐wave warming in dry regions (during the day) further enhances radiative
cooling there compared to moist regions. Overall, the radiative cooling is enhanced
in dry regions compared to neighboring moist convective regions. A dry subsidence
is driven by this net radiative (short‐wave plus long‐wave) cooling, consistent
with earlier work on CSA. Stronger radiative cooling allows stronger subsidence
which allows low‐level circulation to more efficiently transport moisture and
energy up‐gradient, driving convection to aggregate faster. We also note a sensitivity
of our experimental setup to initial conditions, more so at warmer SST. This stochastic
behavior might be critical in reconciling the differences of opinion regarding
the response of convection aggregation to oscillating SST forcing.
acknowledged_ssus:
- _id: ScienComp
acknowledgement: The authors gratefully acknowledge funding from the European Research
Council (ERC) under the European Union's Horizon 2020 research and innovation program
(Project CLUSTER, Grant Agreement No. 805041). This research was supported by the
Scientific Service Units (SSU) of ISTA through resources provided by Scientific
Computing (SciComp). We are grateful to three anonymous reviewer(s) for their insightful
suggestions that have improved the quality of our manuscript. Open Access funding
provided by Institute of Science and Technology Austria/KEMÖ.
article_number: e2024MS004576
article_processing_charge: Yes
article_type: original
author:
- first_name: BIDYUT B
full_name: GOSWAMI, BIDYUT B
id: 3a4ac09c-6d61-11ec-bf66-884cde66b64b
last_name: GOSWAMI
orcid: 0000-0001-8602-3083
- first_name: Ziyin
full_name: Lu, Ziyin
id: a6e549c6-8972-11ed-ae7b-a336d97ac043
last_name: Lu
orcid: 0009-0008-5320-7730
- first_name: Caroline J
full_name: Muller, Caroline J
id: f978ccb0-3f7f-11eb-b193-b0e2bd13182b
last_name: Muller
orcid: 0000-0001-5836-5350
citation:
ama: GOSWAMI BB, Lu Z, Muller CJ. Convective self‐aggregation in diurnally oscillating
sea surface temperature and solar forcing experiments. Journal of Advances
in Modeling Earth Systems. 2026;18(1). doi:10.1029/2024ms004576
apa: GOSWAMI, B. B., Lu, Z., & Muller, C. J. (2026). Convective self‐aggregation
in diurnally oscillating sea surface temperature and solar forcing experiments.
Journal of Advances in Modeling Earth Systems. Wiley. https://doi.org/10.1029/2024ms004576
chicago: GOSWAMI, BIDYUT B, Ziyin Lu, and Caroline J Muller. “Convective Self‐aggregation
in Diurnally Oscillating Sea Surface Temperature and Solar Forcing Experiments.”
Journal of Advances in Modeling Earth Systems. Wiley, 2026. https://doi.org/10.1029/2024ms004576.
ieee: B. B. GOSWAMI, Z. Lu, and C. J. Muller, “Convective self‐aggregation in diurnally
oscillating sea surface temperature and solar forcing experiments,” Journal
of Advances in Modeling Earth Systems, vol. 18, no. 1. Wiley, 2026.
ista: GOSWAMI BB, Lu Z, Muller CJ. 2026. Convective self‐aggregation in diurnally
oscillating sea surface temperature and solar forcing experiments. Journal of
Advances in Modeling Earth Systems. 18(1), e2024MS004576.
mla: GOSWAMI, BIDYUT B., et al. “Convective Self‐aggregation in Diurnally Oscillating
Sea Surface Temperature and Solar Forcing Experiments.” Journal of Advances
in Modeling Earth Systems, vol. 18, no. 1, e2024MS004576, Wiley, 2026, doi:10.1029/2024ms004576.
short: B.B. GOSWAMI, Z. Lu, C.J. Muller, Journal of Advances in Modeling Earth Systems
18 (2026).
corr_author: '1'
date_created: 2026-01-20T10:08:54Z
date_published: 2026-01-12T00:00:00Z
date_updated: 2026-01-21T08:41:19Z
day: '12'
ddc:
- '550'
department:
- _id: CaMu
- _id: BjHo
- _id: GradSch
doi: 10.1029/2024ms004576
ec_funded: 1
file:
- access_level: open_access
checksum: 6ea369e3b46bea58efab4f38b6c671a7
content_type: application/pdf
creator: dernst
date_created: 2026-01-21T08:39:01Z
date_updated: 2026-01-21T08:39:01Z
file_id: '21027'
file_name: 2026_JAMES_Goswami.pdf
file_size: 19509786
relation: main_file
success: 1
file_date_updated: 2026-01-21T08:39:01Z
has_accepted_license: '1'
intvolume: ' 18'
issue: '1'
language:
- iso: eng
license: https://creativecommons.org/licenses/by-nc-nd/4.0/
month: '01'
oa: 1
oa_version: Published Version
project:
- _id: 629205d8-2b32-11ec-9570-e1356ff73576
call_identifier: H2020
grant_number: '805041'
name: Organization of CLoUdS, and implications of Tropical cyclones and for the
Energetics of the tropics, in current and waRming climate
publication: Journal of Advances in Modeling Earth Systems
publication_identifier:
eissn:
- 1942-2466
publication_status: published
publisher: Wiley
quality_controlled: '1'
scopus_import: '1'
status: public
title: Convective self‐aggregation in diurnally oscillating sea surface temperature
and solar forcing experiments
tmp:
image: /images/cc_by_nc_nd.png
legal_code_url: https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode
name: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
(CC BY-NC-ND 4.0)
short: CC BY-NC-ND (4.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 18
year: '2026'
...
---
OA_place: publisher
OA_type: hybrid
PlanS_conform: '1'
_id: '21295'
abstract:
- lang: eng
text: 'Depending on the type of flow, the transition to turbulence can take one
of two forms: either turbulence arises from a sequence of instabilities or from
the spatial proliferation of transiently chaotic domains, a process analogous
to directed percolation. The former scenario is commonly referred to as a supercritical
transition and frequently encountered in flows destabilized by body forces, whereas
the latter subcritical transition is common in shear flows. Both cases are inherently
continuous in a sense that the transformation from ordered laminar to fully turbulent
fluid motion is only accomplished gradually with flow speed. Here we show that
these established transition types do not account for the more general setting
of shear flows subject to body forces. The combination of the two continuous scenarios
leads to the attenuation of spatial coupling; with increasing forcing amplitude,
the transition becomes increasingly sharp and eventually discontinuous. We argue
that the suppression of laminar–turbulent coexistence and the approach towards
a discontinuous phase transition potentially apply to a broad range of situations
including flows subject to, for example, buoyancy, centrifugal or electromagnetic
forces.'
acknowledgement: The work was supported by the Simons Foundation (grant number 662960,
to B.H.). Open access funding provided by Institute of Science and Technology (IST
Austria).
article_processing_charge: Yes (via OA deal)
article_type: original
arxiv: 1
author:
- first_name: Bowen
full_name: Yang, Bowen
id: 71b6ff4b-15b2-11ec-abd3-aef6b028cf7e
last_name: Yang
orcid: 0000-0002-4843-6853
- first_name: Yi
full_name: Zhuang, Yi
id: 3677B57C-F248-11E8-B48F-1D18A9856A87
last_name: Zhuang
- first_name: Gökhan
full_name: Yalniz, Gökhan
id: 66E74FA2-D8BF-11E9-8249-8DE2E5697425
last_name: Yalniz
orcid: 0000-0002-8490-9312
- first_name: Mukund
full_name: Vasudevan, Mukund
id: 3C5A959A-F248-11E8-B48F-1D18A9856A87
last_name: Vasudevan
- first_name: Elena
full_name: Marensi, Elena
id: 0BE7553A-1004-11EA-B805-18983DDC885E
last_name: Marensi
orcid: 0000-0001-7173-4923
- first_name: Björn
full_name: Hof, Björn
id: 3A374330-F248-11E8-B48F-1D18A9856A87
last_name: Hof
orcid: 0000-0003-2057-2754
citation:
ama: Yang B, Zhuang Y, Yalniz G, Vasudevan M, Marensi E, Hof B. Discontinuous transition
to shear flow turbulence. Nature Physics. 2026. doi:10.1038/s41567-025-03166-3
apa: Yang, B., Zhuang, Y., Yalniz, G., Vasudevan, M., Marensi, E., & Hof, B.
(2026). Discontinuous transition to shear flow turbulence. Nature Physics.
Springer Nature. https://doi.org/10.1038/s41567-025-03166-3
chicago: Yang, Bowen, Yi Zhuang, Gökhan Yalniz, Mukund Vasudevan, Elena Marensi,
and Björn Hof. “Discontinuous Transition to Shear Flow Turbulence.” Nature
Physics. Springer Nature, 2026. https://doi.org/10.1038/s41567-025-03166-3.
ieee: B. Yang, Y. Zhuang, G. Yalniz, M. Vasudevan, E. Marensi, and B. Hof, “Discontinuous
transition to shear flow turbulence,” Nature Physics. Springer Nature,
2026.
ista: Yang B, Zhuang Y, Yalniz G, Vasudevan M, Marensi E, Hof B. 2026. Discontinuous
transition to shear flow turbulence. Nature Physics.
mla: Yang, Bowen, et al. “Discontinuous Transition to Shear Flow Turbulence.” Nature
Physics, Springer Nature, 2026, doi:10.1038/s41567-025-03166-3.
short: B. Yang, Y. Zhuang, G. Yalniz, M. Vasudevan, E. Marensi, B. Hof, Nature Physics
(2026).
corr_author: '1'
date_created: 2026-02-17T11:38:41Z
date_published: 2026-02-17T00:00:00Z
date_updated: 2026-02-23T11:36:46Z
day: '17'
ddc:
- '532'
department:
- _id: GradSch
- _id: BjHo
doi: 10.1038/s41567-025-03166-3
external_id:
arxiv:
- '2311.11474'
has_accepted_license: '1'
language:
- iso: eng
month: '02'
oa_version: Published Version
project:
- _id: 238598C6-32DE-11EA-91FC-C7463DDC885E
grant_number: '662960'
name: Revisiting the Turbulence Problem Using Statistical Mechanics
publication: Nature Physics
publication_identifier:
eissn:
- 1745-2481
issn:
- 1745-2473
publication_status: epub_ahead
publisher: Springer Nature
quality_controlled: '1'
scopus_import: '1'
status: public
title: Discontinuous transition to shear flow turbulence
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
year: '2026'
...
---
OA_place: publisher
_id: '19684'
abstract:
- lang: eng
text: "The overarching goal of this thesis is to break down the complexity of turbulent
flows in terms of enumerable, coherent structures and patterns. In a five-paper
series, we adopt a variety of perspectives and techniques to relate the properties
of systems of increasing complexity to their underlying coherent structures. \r\n\r\nInitially,
we take a dynamical systems point of view, seeing turbulent flow as a chaotic
trajectory bouncing between exact unstable solutions of the underlying equations
of motion. Using persistent homology, the main tool of topological data analysis
capturing the persistence across scales of topological features in a point cloud,
we introduce a method that quantifies visits of turbulent trajectories to unstable
time-periodic solutions, also called periodic orbits. We demonstrate this method
first in the Rössler and Kuramoto–Sivashinsky systems. Using this method in 3D
Kolmogorov flow, we extract a Markov chain from turbulent data, where each node
corresponds to the neighbourhood of a periodic orbit. The invariant distribution
of this Markov chain reproduces expectation values on turbulent data when it is
used to weight averages on the respective periodic orbits.\r\n\r\nIn more realistic,
wall-bounded settings, such as plane-Couette flow (pcf) driven by the relative
motion of the walls, or plane-Poiseuille flow (ppf) driven by a pressure gradient,
finding exact solutions is difficult. We use dynamic mode decomposition (DMD),
a dimensionality reduction method for sequential data, to identify and approximate
low-dimensional dynamics without knowing any exact solutions. Most spatially-extended
systems are equivariant under translations, and in such cases spatial drifts dominate
DMD, hindering its use in the search for and modelling of low-dimensional dynamics.
We augment DMD with a symmetry reduction method trained on turbulent data to stop
it from seeing translations as a feature, improving its ability to extract dynamical
information in translation-equivariant systems. We find segments of turbulent
trajectories that linearize well with their symmetry-reduced DMD spectra, akin
to dynamics near exact solutions. Searching for harmonics in the spectra gives
leads for periodic orbits with spatial drifts, one of which converges to a new
solution.\r\n\r\nIn larger domains, turbulence can localize and coexist with surrounding
laminar flow. Our preceding approaches are global, taking all of a domain into
account at once, and cannot readily treat each localized patch individually. Working
first in a minimal oblique domain that can host a single 1D-localized turbulent
patch, we find that turbulence in ppf is connected to a stable periodic orbit
at a flow velocity much lower than when turbulence is first onset. We show that,
well in advance of sustained turbulence, chaos sets in explosively, and for long
time horizons, time series are consistent with that of a random process.\r\n\r\nFinally,
in much larger domains, we study and compare 2D-localized turbulence that appears
as large-scale inclined structures, called stripes, in ppf and pcf. While appearing
similar, we find that stripes in these two settings differ significantly in terms
of how they sustain themselves, and in higher velocities, how they proliferate."
acknowledged_ssus:
- _id: ScienComp
acknowledgement: "The work in this thesis was supported by a grant from the Simons
Foundation (662960, BH).\r\n"
alternative_title:
- ISTA Thesis
article_processing_charge: No
author:
- first_name: Gökhan
full_name: Yalniz, Gökhan
id: 66E74FA2-D8BF-11E9-8249-8DE2E5697425
last_name: Yalniz
orcid: 0000-0002-8490-9312
citation:
ama: 'Yalniz G. Transition to turbulence : Data-, solution-, and pattern-driven
approaches. 2025. doi:10.15479/AT-ISTA-19684'
apa: 'Yalniz, G. (2025). Transition to turbulence : Data-, solution-, and pattern-driven
approaches. Institute of Science and Technology Austria. https://doi.org/10.15479/AT-ISTA-19684'
chicago: 'Yalniz, Gökhan. “Transition to Turbulence : Data-, Solution-, and Pattern-Driven
Approaches.” Institute of Science and Technology Austria, 2025. https://doi.org/10.15479/AT-ISTA-19684.'
ieee: 'G. Yalniz, “Transition to turbulence : Data-, solution-, and pattern-driven
approaches,” Institute of Science and Technology Austria, 2025.'
ista: 'Yalniz G. 2025. Transition to turbulence : Data-, solution-, and pattern-driven
approaches. Institute of Science and Technology Austria.'
mla: 'Yalniz, Gökhan. Transition to Turbulence : Data-, Solution-, and Pattern-Driven
Approaches. Institute of Science and Technology Austria, 2025, doi:10.15479/AT-ISTA-19684.'
short: 'G. Yalniz, Transition to Turbulence : Data-, Solution-, and Pattern-Driven
Approaches, Institute of Science and Technology Austria, 2025.'
corr_author: '1'
date_created: 2025-05-12T15:12:28Z
date_published: 2025-05-13T00:00:00Z
date_updated: 2026-06-18T19:23:35Z
day: '13'
ddc:
- '514'
- '519'
- '532'
- '004'
degree_awarded: PhD
department:
- _id: GradSch
- _id: BjHo
doi: 10.15479/AT-ISTA-19684
file:
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checksum: 0e452642b79f13633f1595bde71a67e3
content_type: application/pdf
creator: gyalniz
date_created: 2025-05-12T15:13:28Z
date_updated: 2025-05-12T15:13:28Z
file_id: '19685'
file_name: Gökhan Yalnız - PhD thesis.pdf
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success: 1
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content_type: video/mp4
creator: gyalniz
date_created: 2025-05-12T15:15:59Z
date_updated: 2025-05-12T15:43:28Z
description: '3D visualizations of the turbulent flow (left) and the periodic orbits
(middle) that are being shadowed along with the local state space projections
(right) onto the principal components of the respective periodic orbit. Shown
here are the isosurfaces of velocity (red/blue: ±95% of the instantaneous maximum)
and vorticity (purple/green: ±65% of the instantaneous maximum) in the x-direction.
Markers along the projections are in sync with the 3D visualizations. The movie
corresponds to the initial time interval (up to t = 100) of figure 2.2 (a,b);
periodic orbits and the state space projections are shown only through the shadowing
events indicated in figure 2.2 (b).'
file_id: '19686'
file_name: Movie 2A.1.mp4
file_size: 37763743
relation: supplementary_material
title: Chapter 2 - Movie 2A.1
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content_type: video/mp4
creator: gyalniz
date_created: 2025-05-12T15:16:09Z
date_updated: 2025-05-12T15:43:28Z
description: 'Turbulent flow (left) in HKW domain and its symmetry reduction (right).
Shown here are the isosurfaces of streamwise velocity (red/blue: u = 0.5 max/min
u) and streamwise vorticity (green/purple: ω_x = 0.5 max/min ω_x).'
file_id: '19687'
file_name: Movie 3A.1.mp4
file_size: 3902655
relation: supplementary_material
title: Chapter 3 - Movie 3A.1
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content_type: video/mp4
creator: gyalniz
date_created: 2025-05-12T15:16:21Z
date_updated: 2025-05-12T15:43:28Z
description: 'Turbulent flow (left) in P2K domain and its symmetry reduction (right).
Shown here are the isosurfaces of streamwise velocity (red/blue: u = 0.5 max/min
u) and streamwise vorticity (green/purple: ω_x = 0.5 max/min ω_x).'
file_id: '19688'
file_name: Movie 3A.2.mp4
file_size: 7043169
relation: supplementary_material
title: Chapter 3 - Movie 3A.2
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content_type: video/mp4
creator: gyalniz
date_created: 2025-05-12T15:16:36Z
date_updated: 2025-05-12T15:43:28Z
description: 'Relative periodic orbit RPO_79.4 (left) of the plane-Couette flow
(HKW domain) and its symmetry reduction (right). Shown here are the isosurfaces
of streamwise velocity (red/blue: u = 0.5 max/min u) and streamwise vorticity
(green/purple: ω_x = 0.5 max/min ω_x).'
file_id: '19689'
file_name: Movie 3A.3.mp4
file_size: 7748659
relation: supplementary_material
title: Chapter 3 - Movie 3A.3
- access_level: open_access
checksum: dd5a252e1da00c8f303588e22e2baeef
content_type: video/mp4
creator: gyalniz
date_created: 2025-05-12T15:16:50Z
date_updated: 2025-05-12T15:43:28Z
description: 'Symmetry-reduced flow (left), its SRDMD approximation (middle), and
state space projection (right) showing the spiral-out episode in P2K domain (figure
3.6 (b) and figure 3.8 (b)). Shown here are the isosurfaces of streamwise velocity
(red/blue: u = 0.5 max/min u) and streamwise vorticity (green/purple: ω_x = 0.5
max/min ω_x).'
file_id: '19690'
file_name: Movie 3A.4.mp4
file_size: 5873052
relation: supplementary_material
title: Chapter 3 - Movie 3A.4
- access_level: open_access
checksum: 5ac58b86810698db28cbfc28f351ff70
content_type: video/mp4
creator: gyalniz
date_created: 2025-05-12T15:17:11Z
date_updated: 2025-05-12T15:43:28Z
description: Movie demonstrating the quasi-steady Reynolds number descent from turbulence
to a periodic orbit.
file_id: '19691'
file_name: Movie 4A.1.mp4
file_size: 9209327
relation: supplementary_material
title: Chapter 4 - Movie 4A.1
- access_level: open_access
checksum: ac877f1e1ef39439911bf37cb1793b8e
content_type: video/mp4
creator: gyalniz
date_created: 2025-05-12T15:17:43Z
date_updated: 2025-05-12T15:43:28Z
description: Streamwise velocity fluctuations (from laminar) of plane-Couette flow
(Re^C =335) at the y = 0 wall-normal plane in coordinates stationary with respect
to the bulk velocity. Here, x is the streamwise direction (the wall at y = 1 moves
to the right) and z is the spanwise direction. Time is in advectime time units.
Shown is the full (L_x = L_z = 400) domain.
file_id: '19692'
file_name: Movie 5A.1.mp4
file_size: 5893993
relation: supplementary_material
title: Chapter 5 - Movie 5A.1
- access_level: open_access
checksum: fd17eabb70129ceaa414e40924d1d2fe
content_type: video/mp4
creator: gyalniz
date_created: 2025-05-12T15:17:49Z
date_updated: 2025-05-12T15:43:28Z
description: Streamwise velocity fluctuations (from laminar) of plane-Poiseuille
flow (Re^P =660) at the y = 0.5 wall-normal plane in coordinates stationary with
respect to the bulk velocity. Here, x is the streamwise direction (the mean negative
pressure gradient is to the right) and z is the spanwise direction. Time is in
advectime time units. Shown is the full (L_x = L_z = 400) domain.
file_id: '19693'
file_name: Movie 5A.2.mp4
file_size: 3990352
relation: supplementary_material
title: Chapter 5 - Movie 5A.2
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content_type: video/mp4
creator: gyalniz
date_created: 2025-05-12T15:17:58Z
date_updated: 2025-05-12T15:43:28Z
description: Streamwise velocity fluctuations (from laminar) of plane-Poiseuille
flow (Re^P=660) at the y = 0.5 wall-normal plane in coordinates stationary with
respect to the average velocity of the downstream tip of the stripe. Here, x is
the streamwise direction (the mean negative pressure gradient is to the right)
and z is the spanwise direction. Time is in advectime time units. Shown is a zoom-in
of the full (L_x = L_z) domain.
file_id: '19694'
file_name: Movie 5A.3.mp4
file_size: 5171009
relation: supplementary_material
title: Chapter 5 - Movie 5A.3
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content_type: application/x-zip-compressed
creator: gyalniz
date_created: 2025-05-12T15:27:10Z
date_updated: 2025-05-12T15:43:28Z
file_id: '19695'
file_name: Gökhan Yalnız - PhD thesis.zip
file_size: 18991996
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file_date_updated: 2025-05-12T15:43:28Z
has_accepted_license: '1'
language:
- iso: eng
month: '05'
oa: 1
oa_version: Published Version
page: '155'
project:
- _id: 238598C6-32DE-11EA-91FC-C7463DDC885E
grant_number: '662960'
name: Revisiting the Turbulence Problem Using Statistical Mechanics
publication_identifier:
issn:
- 2663-337X
publication_status: published
publisher: Institute of Science and Technology Austria
related_material:
record:
- id: '9558'
relation: part_of_dissertation
status: public
- id: '12105'
relation: part_of_dissertation
status: public
- id: '13274'
relation: part_of_dissertation
status: public
- id: '14466'
relation: part_of_dissertation
status: public
- id: '7563'
relation: part_of_dissertation
status: public
status: public
supervisor:
- first_name: Björn
full_name: Hof, Björn
id: 3A374330-F248-11E8-B48F-1D18A9856A87
last_name: Hof
orcid: 0000-0003-2057-2754
title: 'Transition to turbulence : Data-, solution-, and pattern-driven approaches'
type: dissertation
user_id: ba8df636-2132-11f1-aed0-ed93e2281fdd
year: '2025'
...
---
OA_place: publisher
OA_type: hybrid
_id: '19729'
abstract:
- lang: eng
text: 'From anthropogenic litter carried by ocean currents to plant stems travelling
through the atmosphere, geophysical flows are often seeded with elongated, fibre-like
particles. In this study, we used a large-scale laboratory model of a tidal current
– representative of a widespread class of geophysical flows – to investigate the
tumbling motion of long, slender and floating fibres in the complex turbulence
generated by flow interactions with a tidal inlet. Despite the non-stationary,
non-homogeneous and anisotropic nature of this turbulence, we find that long fibres
statistically rotate at the same frequency as eddies of similar size, a phenomenon
called scale selection, which is known to occur in ideal turbulence. Furthermore,
we report that the signal of the instantaneous transverse velocity difference
between the fibre ends changes significantly from the signal produced by the flow
in the fibre surroundings, although the two are statistically equivalent. These
observations have twofold implications. On the one hand, they confirm the reliability
of using the end-to-end velocity signal of rigid fibres to probe the two-point
transverse statistics of the flow, even under realistic conditions: oceanographers
could exploit this observation to measure transverse velocity differences through
elongated floats in the field, where superdiffusion complicates collecting sufficient
data to probe two-point turbulence statistics at a fixed separation effectively.
On the other hand, by addressing the dynamics of inertial range particles floating
in the coastal zone, these observations are crucial to improving our ability to
predict the fate of meso- and macro-litter, a size class that is currently understudied.'
acknowledgement: A.S. expresses thanks for support from the Research Grants Council
of Hong Kong (project IDs 15216422 and C5032-22EF) and from the Research Institute
for Land and Space (RILS) (project ID P0049622). S.B. is funded by the European
Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie
grant agreement (no.101034413).
article_number: A5
article_processing_charge: No
article_type: original
author:
- first_name: Annalisa
full_name: De Leo, Annalisa
last_name: De Leo
- first_name: Stefano
full_name: Brizzolara, Stefano
id: 4bbe33b8-c59a-11ee-a1af-fa33d1ac42c4
last_name: Brizzolara
- first_name: Mattia
full_name: Cavaiola, Mattia
last_name: Cavaiola
- first_name: Junlin
full_name: He, Junlin
last_name: He
- first_name: Alessandro
full_name: Stocchino, Alessandro
last_name: Stocchino
citation:
ama: De Leo A, Brizzolara S, Cavaiola M, He J, Stocchino A. Rigid fibre transport
in a periodic non-homogeneous geophysical turbulent flow. Journal of Fluid
Mechanics. 2025;1011. doi:10.1017/jfm.2025.362
apa: De Leo, A., Brizzolara, S., Cavaiola, M., He, J., & Stocchino, A. (2025).
Rigid fibre transport in a periodic non-homogeneous geophysical turbulent flow.
Journal of Fluid Mechanics. Cambridge University Press. https://doi.org/10.1017/jfm.2025.362
chicago: De Leo, Annalisa, Stefano Brizzolara, Mattia Cavaiola, Junlin He, and Alessandro
Stocchino. “Rigid Fibre Transport in a Periodic Non-Homogeneous Geophysical Turbulent
Flow.” Journal of Fluid Mechanics. Cambridge University Press, 2025. https://doi.org/10.1017/jfm.2025.362.
ieee: A. De Leo, S. Brizzolara, M. Cavaiola, J. He, and A. Stocchino, “Rigid fibre
transport in a periodic non-homogeneous geophysical turbulent flow,” Journal
of Fluid Mechanics, vol. 1011. Cambridge University Press, 2025.
ista: De Leo A, Brizzolara S, Cavaiola M, He J, Stocchino A. 2025. Rigid fibre transport
in a periodic non-homogeneous geophysical turbulent flow. Journal of Fluid Mechanics.
1011, A5.
mla: De Leo, Annalisa, et al. “Rigid Fibre Transport in a Periodic Non-Homogeneous
Geophysical Turbulent Flow.” Journal of Fluid Mechanics, vol. 1011, A5,
Cambridge University Press, 2025, doi:10.1017/jfm.2025.362.
short: A. De Leo, S. Brizzolara, M. Cavaiola, J. He, A. Stocchino, Journal of Fluid
Mechanics 1011 (2025).
date_created: 2025-05-25T22:16:46Z
date_published: 2025-05-16T00:00:00Z
date_updated: 2025-09-30T12:38:34Z
day: '16'
ddc:
- '530'
department:
- _id: BjHo
doi: 10.1017/jfm.2025.362
ec_funded: 1
external_id:
isi:
- '001489159700001'
file:
- access_level: open_access
checksum: f1b0f6a977fdf2d6eb9e16c11d030c0c
content_type: application/pdf
creator: dernst
date_created: 2025-05-28T08:12:07Z
date_updated: 2025-05-28T08:12:07Z
file_id: '19751'
file_name: 2025_JourFluidMech_DeLeo.pdf
file_size: 6415303
relation: main_file
success: 1
file_date_updated: 2025-05-28T08:12:07Z
has_accepted_license: '1'
intvolume: ' 1011'
isi: 1
language:
- iso: eng
month: '05'
oa: 1
oa_version: Published Version
project:
- _id: fc2ed2f7-9c52-11eb-aca3-c01059dda49c
call_identifier: H2020
grant_number: '101034413'
name: 'IST-BRIDGE: International postdoctoral program'
publication: Journal of Fluid Mechanics
publication_identifier:
eissn:
- 1469-7645
issn:
- 0022-1120
publication_status: published
publisher: Cambridge University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: Rigid fibre transport in a periodic non-homogeneous geophysical turbulent flow
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 1011
year: '2025'
...
---
OA_place: publisher
OA_type: hybrid
_id: '19730'
abstract:
- lang: eng
text: Feigenbaum universality is shown to occur in subcritical shear flows. Our
testing ground is the counter-rotation regime of the Taylor–Couette flow, where
numerical calculations are performed within a small periodic domain. The accurate
computation of up to the seventh period-doubling bifurcation, assisted by a purposely
defined Poincaré section, has enabled us to reproduce the two Feigenbaum universal
constants with unprecedented accuracy in a fluid flow problem. We have further
devised a method to predict the bifurcation diagram up to the accumulation point
of the cascade based on the detailed inspection of just the first few period-doubling
bifurcations. Remarkably, the method is applicable beyond the accumulation point,
with predictions remaining valid, in a statistical sense, for the chaotic dynamics
that follows.
acknowledgement: This research is supported by the Australian Research Council Discovery
Project DP230102188 and the Ministerio de Ciencia, Innovación y Universidades (Agencia
Estatal de Investigación, project nos. PID 2020–114043 GB-I00 (MCIN/AEI/10.13039/501100011033)
and PID 2023–150029NB-I00 (MCIN/AEI/10.13039/501100011033/FEDER, UE). B.W.’s and
R.A.’s research has been funded by the European Union’s Horizon 2020 research and
innovation programme (Marie Skłodowska-Curie Grant Agreement No. 101034413). R.A.
has also been funded by the Austrian Science Fund (FWF) 10.55776/ESP1481224.
article_number: A36
article_processing_charge: Yes (in subscription journal)
article_type: original
author:
- first_name: Baoying
full_name: Wang, Baoying
id: df755ffe-735a-11ee-bb55-dff29d61d338
last_name: Wang
orcid: 0000-0002-6229-0336
- first_name: Roger
full_name: Ayats López, Roger
id: ab77522d-073b-11ed-8aff-e71b39258362
last_name: Ayats López
orcid: 0000-0001-6572-0621
- first_name: K.
full_name: Deguchi, K.
last_name: Deguchi
- first_name: A.
full_name: Meseguer, A.
last_name: Meseguer
- first_name: F.
full_name: Mellibovsky, F.
last_name: Mellibovsky
citation:
ama: Wang B, Ayats López R, Deguchi K, Meseguer A, Mellibovsky F. Feigenbaum universality
in subcritical Taylor-Couette flow. Journal of Fluid Mechanics. 2025;1010.
doi:10.1017/jfm.2025.278
apa: Wang, B., Ayats López, R., Deguchi, K., Meseguer, A., & Mellibovsky, F.
(2025). Feigenbaum universality in subcritical Taylor-Couette flow. Journal
of Fluid Mechanics. Cambridge University Press. https://doi.org/10.1017/jfm.2025.278
chicago: Wang, Baoying, Roger Ayats López, K. Deguchi, A. Meseguer, and F. Mellibovsky.
“Feigenbaum Universality in Subcritical Taylor-Couette Flow.” Journal of Fluid
Mechanics. Cambridge University Press, 2025. https://doi.org/10.1017/jfm.2025.278.
ieee: B. Wang, R. Ayats López, K. Deguchi, A. Meseguer, and F. Mellibovsky, “Feigenbaum
universality in subcritical Taylor-Couette flow,” Journal of Fluid Mechanics,
vol. 1010. Cambridge University Press, 2025.
ista: Wang B, Ayats López R, Deguchi K, Meseguer A, Mellibovsky F. 2025. Feigenbaum
universality in subcritical Taylor-Couette flow. Journal of Fluid Mechanics. 1010,
A36.
mla: Wang, Baoying, et al. “Feigenbaum Universality in Subcritical Taylor-Couette
Flow.” Journal of Fluid Mechanics, vol. 1010, A36, Cambridge University
Press, 2025, doi:10.1017/jfm.2025.278.
short: B. Wang, R. Ayats López, K. Deguchi, A. Meseguer, F. Mellibovsky, Journal
of Fluid Mechanics 1010 (2025).
date_created: 2025-05-25T22:16:48Z
date_published: 2025-05-14T00:00:00Z
date_updated: 2025-09-30T12:39:05Z
day: '14'
ddc:
- '530'
department:
- _id: BjHo
doi: 10.1017/jfm.2025.278
ec_funded: 1
external_id:
isi:
- '001487354900001'
file:
- access_level: open_access
checksum: 77f39b762a0e59e88954afb93b23cc7a
content_type: application/pdf
creator: dernst
date_created: 2025-05-28T08:32:33Z
date_updated: 2025-05-28T08:32:33Z
file_id: '19752'
file_name: 2025_JourFluidMech_Wang.pdf
file_size: 3607069
relation: main_file
success: 1
file_date_updated: 2025-05-28T08:32:33Z
has_accepted_license: '1'
intvolume: ' 1010'
isi: 1
language:
- iso: eng
month: '05'
oa: 1
oa_version: Published Version
project:
- _id: fc2ed2f7-9c52-11eb-aca3-c01059dda49c
call_identifier: H2020
grant_number: '101034413'
name: 'IST-BRIDGE: International postdoctoral program'
- _id: 942a0200-16d5-11f0-9cad-f48ab22dfd1c
grant_number: ESP 1481224
name: Pattern Formation Mechanisms in Planar Shear Flows
publication: Journal of Fluid Mechanics
publication_identifier:
eissn:
- 1469-7645
issn:
- 0022-1120
publication_status: published
publisher: Cambridge University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: Feigenbaum universality in subcritical Taylor-Couette flow
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 1010
year: '2025'
...
---
OA_place: publisher
OA_type: hybrid
_id: '19732'
abstract:
- lang: eng
text: The transition to chaos in the subcritical regime of counter-rotating Taylor–Couette
flow is investigated using a minimal periodic domain capable of sustaining coherent
structures. Following a Feigenbaum cascade, the dynamics is found to be remarkably
well approximated by a simple discrete map that admits rigorous proof of its chaotic
nature. The chaotic set that arises for the map features densely distributed periodic
points that are in one-to-one correspondence with unstable periodic orbits (UPOs)
of the Navier–Stokes system. This supports the increasingly accepted view that
UPOs may serve as the backbone of turbulence and, indeed, we demonstrate that
it is possible to reconstruct every statistical property of chaotic fluid flow
from UPOs.
acknowledgement: This research is supported by the Australian Research Council Discovery
Project DP230102188 and the Ministerio de Ciencia, Innovación y Universidades (Agencia
Estatal de Investigación, project nos PID 2020-114043 GB-I00 (MCIN/AEI/10.13039/501100011033)
and PID 2023-150029NB-I00 (MCIN/AEI/10.13039/ 501100011033/FEDER, UE). B.W. and
R.A.’s research has been funded by the European Union’s Horizon 2020 research and
innovation programme (Marie Skłodowska-Curie grant agreement no. 101034413). R.A.
has also been funded by the Austrian Science Fund (FWF) 10.55776/ESP1481224.
article_number: R2
article_processing_charge: Yes (in subscription journal)
article_type: original
author:
- first_name: Baoying
full_name: Wang, Baoying
id: df755ffe-735a-11ee-bb55-dff29d61d338
last_name: Wang
orcid: 0000-0002-6229-0336
- first_name: Roger
full_name: Ayats López, Roger
id: ab77522d-073b-11ed-8aff-e71b39258362
last_name: Ayats López
orcid: 0000-0001-6572-0621
- first_name: K.
full_name: Deguchi, K.
last_name: Deguchi
- first_name: A.
full_name: Meseguer, A.
last_name: Meseguer
- first_name: F.
full_name: Mellibovsky, F.
last_name: Mellibovsky
citation:
ama: Wang B, Ayats López R, Deguchi K, Meseguer A, Mellibovsky F. Mathematically
established chaos and forecast of statistics with recurrent patterns in Taylor-Couette
flow. Journal of Fluid Mechanics. 2025;1011. doi:10.1017/jfm.2025.151
apa: Wang, B., Ayats López, R., Deguchi, K., Meseguer, A., & Mellibovsky, F.
(2025). Mathematically established chaos and forecast of statistics with recurrent
patterns in Taylor-Couette flow. Journal of Fluid Mechanics. Cambridge
University Press. https://doi.org/10.1017/jfm.2025.151
chicago: Wang, Baoying, Roger Ayats López, K. Deguchi, A. Meseguer, and F. Mellibovsky.
“Mathematically Established Chaos and Forecast of Statistics with Recurrent Patterns
in Taylor-Couette Flow.” Journal of Fluid Mechanics. Cambridge University
Press, 2025. https://doi.org/10.1017/jfm.2025.151.
ieee: B. Wang, R. Ayats López, K. Deguchi, A. Meseguer, and F. Mellibovsky, “Mathematically
established chaos and forecast of statistics with recurrent patterns in Taylor-Couette
flow,” Journal of Fluid Mechanics, vol. 1011. Cambridge University Press,
2025.
ista: Wang B, Ayats López R, Deguchi K, Meseguer A, Mellibovsky F. 2025. Mathematically
established chaos and forecast of statistics with recurrent patterns in Taylor-Couette
flow. Journal of Fluid Mechanics. 1011, R2.
mla: Wang, Baoying, et al. “Mathematically Established Chaos and Forecast of Statistics
with Recurrent Patterns in Taylor-Couette Flow.” Journal of Fluid Mechanics,
vol. 1011, R2, Cambridge University Press, 2025, doi:10.1017/jfm.2025.151.
short: B. Wang, R. Ayats López, K. Deguchi, A. Meseguer, F. Mellibovsky, Journal
of Fluid Mechanics 1011 (2025).
date_created: 2025-05-25T22:16:52Z
date_published: 2025-05-13T00:00:00Z
date_updated: 2025-09-30T12:39:44Z
day: '13'
ddc:
- '530'
department:
- _id: BjHo
doi: 10.1017/jfm.2025.151
ec_funded: 1
external_id:
isi:
- '001486096600001'
file:
- access_level: open_access
checksum: 899df5797844a9e811dffeebe8c05c8e
content_type: application/pdf
creator: dernst
date_created: 2025-05-28T09:00:52Z
date_updated: 2025-05-28T09:00:52Z
file_id: '19754'
file_name: 2025_JourFluidMech_Wang_Ayats.pdf
file_size: 998754
relation: main_file
success: 1
file_date_updated: 2025-05-28T09:00:52Z
has_accepted_license: '1'
intvolume: ' 1011'
isi: 1
language:
- iso: eng
month: '05'
oa: 1
oa_version: Published Version
project:
- _id: fc2ed2f7-9c52-11eb-aca3-c01059dda49c
call_identifier: H2020
grant_number: '101034413'
name: 'IST-BRIDGE: International postdoctoral program'
- _id: 942a0200-16d5-11f0-9cad-f48ab22dfd1c
grant_number: ESP 1481224
name: Pattern Formation Mechanisms in Planar Shear Flows
publication: Journal of Fluid Mechanics
publication_identifier:
eissn:
- 1469-7645
issn:
- 0022-1120
publication_status: published
publisher: Cambridge University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: Mathematically established chaos and forecast of statistics with recurrent
patterns in Taylor-Couette flow
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 1011
year: '2025'
...
---
APC_amount: 7068 EUR
DOAJ_listed: '1'
OA_place: publisher
OA_type: gold
PlanS_conform: '1'
_id: '20402'
abstract:
- lang: eng
text: The recent classification of the onset of turbulence as a directed percolation
(DP) phase transition has been applied to all major shear flows including pipe,
channel, Couette and boundary layer flows. A cornerstone of the DP analogy is
the memoryless (Poisson) property of turbulent sites. We here show that, for the
classic case of channel flow, neither the decay nor the proliferation of turbulent
stripes is memoryless. As demonstrated by a standard analysis of the respective
survival curves, isolated channel stripes, in the immediate vicinity of the critical
point, age. Consequently, the one to one mapping between turbulent stripes and
active DP-sites is not fulfilled in this low Reynolds number regime. In addition,
the interpretation of turbulence as a chaotic saddle with supertransient properties,
the basis of recent theoretical progress, does not apply to individual localized
stripes. The discrepancy between channel flow and the transition models established
for pipe and Couette flow, illustrates that seemingly minor geometrical differences
between flows can give rise to instabilities and growth mechanisms that fundamentally
alter the nature of the transition to turbulence.
acknowledgement: This work was supported by a grant from the Simons Foundation (662960,
BH). We thank Yohann Duguet for helpful discussions, Baofang Song for the initial
adaptation of openpipeflow57 to the channel geometry, and Ashley P. Willis for openpipeflow57.
article_number: '8447'
article_processing_charge: Yes
article_type: original
arxiv: 1
author:
- first_name: Mukund
full_name: Vasudevan, Mukund
id: 3C5A959A-F248-11E8-B48F-1D18A9856A87
last_name: Vasudevan
- first_name: Chaitanya S
full_name: Paranjape, Chaitanya S
id: 3D85B7C4-F248-11E8-B48F-1D18A9856A87
last_name: Paranjape
- first_name: Michael Philip
full_name: Sitte, Michael Philip
id: 0ba0f1f2-9cfe-11f0-bee6-f95318d225b0
last_name: Sitte
- first_name: Gökhan
full_name: Yalniz, Gökhan
id: 66E74FA2-D8BF-11E9-8249-8DE2E5697425
last_name: Yalniz
orcid: 0000-0002-8490-9312
- first_name: Björn
full_name: Hof, Björn
id: 3A374330-F248-11E8-B48F-1D18A9856A87
last_name: Hof
orcid: 0000-0003-2057-2754
citation:
ama: Vasudevan M, Paranjape CS, Sitte MP, Yalniz G, Hof B. Aging and memory of transitional
turbulence. Nature Communications. 2025;16. doi:10.1038/s41467-025-63044-7
apa: Vasudevan, M., Paranjape, C. S., Sitte, M. P., Yalniz, G., & Hof, B. (2025).
Aging and memory of transitional turbulence. Nature Communications. Springer
Nature. https://doi.org/10.1038/s41467-025-63044-7
chicago: Vasudevan, Mukund, Chaitanya S Paranjape, Michael Philip Sitte, Gökhan
Yalniz, and Björn Hof. “Aging and Memory of Transitional Turbulence.” Nature
Communications. Springer Nature, 2025. https://doi.org/10.1038/s41467-025-63044-7.
ieee: M. Vasudevan, C. S. Paranjape, M. P. Sitte, G. Yalniz, and B. Hof, “Aging
and memory of transitional turbulence,” Nature Communications, vol. 16.
Springer Nature, 2025.
ista: Vasudevan M, Paranjape CS, Sitte MP, Yalniz G, Hof B. 2025. Aging and memory
of transitional turbulence. Nature Communications. 16, 8447.
mla: Vasudevan, Mukund, et al. “Aging and Memory of Transitional Turbulence.” Nature
Communications, vol. 16, 8447, Springer Nature, 2025, doi:10.1038/s41467-025-63044-7.
short: M. Vasudevan, C.S. Paranjape, M.P. Sitte, G. Yalniz, B. Hof, Nature Communications
16 (2025).
corr_author: '1'
date_created: 2025-09-27T13:27:31Z
date_published: 2025-09-26T00:00:00Z
date_updated: 2026-05-20T07:56:59Z
day: '26'
ddc:
- '532'
department:
- _id: BjHo
doi: 10.1038/s41467-025-63044-7
external_id:
arxiv:
- '2112.06537'
isi:
- '001582555200041'
file:
- access_level: open_access
checksum: 945926ead9cde464435d456427e2869e
content_type: application/pdf
creator: gyalniz
date_created: 2025-09-27T13:32:03Z
date_updated: 2025-09-27T13:32:03Z
file_id: '20403'
file_name: s41467-025-63044-7.pdf
file_size: 2226082
relation: main_file
file_date_updated: 2025-09-27T13:32:03Z
has_accepted_license: '1'
intvolume: ' 16'
isi: 1
language:
- iso: eng
month: '09'
oa: 1
oa_version: Published Version
project:
- _id: 238598C6-32DE-11EA-91FC-C7463DDC885E
grant_number: '662960'
name: Revisiting the Turbulence Problem Using Statistical Mechanics
- _id: B67AFEDC-15C9-11EA-A837-991A96BB2854
name: IST Austria Open Access Fund
publication: Nature Communications
publication_identifier:
eissn:
- 2041-1723
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
scopus_import: '1'
status: public
title: Aging and memory of transitional turbulence
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 16
year: '2025'
...
---
OA_type: closed access
_id: '19015'
abstract:
- lang: eng
text: When microplastics (MPs) enter water bodies, they undergo various transport
processes, including sedimentation, which can be influenced by factors such as
particle size, density, and interactions with other particles. Surface waters
contain suspended natural particles (e.g., clay and silt), which may impact MP
settling rates. Here, we investigated how the presence of suspended sediments
(SS) influenced the deposition patterns and rates of MPs in turbid waters. We
systematically analyzed the settling velocities of particles, including different
MP sizes and SS concentrations, in a plexiglass column with a camera array. For
each experimental variant, we collected data on thousands of individual MPs, strengthening
the statistical analysis of the particles’ velocities. Simultaneous measurements
of the SS flow and MPs trajectories revealed that the SS induced complex flow
patterns, with MPs spending more time in downwelling flow regions, thereby accelerating
MPs sedimentation. This effect was more pronounced when SS were aggregated. Additionally,
we found that smaller MP fragments were more affected by the fluctuations than
spheres or larger fragments. Collectively, our results provide valuable data for
future MP fate models and help to understand the sedimentation processes of MPs
in natural waters, which is crucial for assessing their environmental transport
and impact.
acknowledgement: F.P. and D.M.M. were funded through the Swiss National Science Foundation
(grant number PCEFP2_186856).
article_processing_charge: No
article_type: original
author:
- first_name: Francesco
full_name: Parrella, Francesco
last_name: Parrella
- first_name: Stefano
full_name: Brizzolara, Stefano
id: 4bbe33b8-c59a-11ee-a1af-fa33d1ac42c4
last_name: Brizzolara
- first_name: Markus
full_name: Holzner, Markus
last_name: Holzner
- first_name: Denise M.
full_name: Mitrano, Denise M.
last_name: Mitrano
citation:
ama: 'Parrella F, Brizzolara S, Holzner M, Mitrano DM. Microplastics settling in
turbid water: Impacts of sediments-induced flow patterns on particle deposition
rates. Environmental Science and Technology. 2025;59(4):2257-2265. doi:10.1021/acs.est.4c10551'
apa: 'Parrella, F., Brizzolara, S., Holzner, M., & Mitrano, D. M. (2025). Microplastics
settling in turbid water: Impacts of sediments-induced flow patterns on particle
deposition rates. Environmental Science and Technology. American Chemical
Society. https://doi.org/10.1021/acs.est.4c10551'
chicago: 'Parrella, Francesco, Stefano Brizzolara, Markus Holzner, and Denise M.
Mitrano. “Microplastics Settling in Turbid Water: Impacts of Sediments-Induced
Flow Patterns on Particle Deposition Rates.” Environmental Science and Technology.
American Chemical Society, 2025. https://doi.org/10.1021/acs.est.4c10551.'
ieee: 'F. Parrella, S. Brizzolara, M. Holzner, and D. M. Mitrano, “Microplastics
settling in turbid water: Impacts of sediments-induced flow patterns on particle
deposition rates,” Environmental Science and Technology, vol. 59, no. 4.
American Chemical Society, pp. 2257–2265, 2025.'
ista: 'Parrella F, Brizzolara S, Holzner M, Mitrano DM. 2025. Microplastics settling
in turbid water: Impacts of sediments-induced flow patterns on particle deposition
rates. Environmental Science and Technology. 59(4), 2257–2265.'
mla: 'Parrella, Francesco, et al. “Microplastics Settling in Turbid Water: Impacts
of Sediments-Induced Flow Patterns on Particle Deposition Rates.” Environmental
Science and Technology, vol. 59, no. 4, American Chemical Society, 2025, pp.
2257–65, doi:10.1021/acs.est.4c10551.'
short: F. Parrella, S. Brizzolara, M. Holzner, D.M. Mitrano, Environmental Science
and Technology 59 (2025) 2257–2265.
date_created: 2025-02-09T23:01:50Z
date_published: 2025-01-27T00:00:00Z
date_updated: 2025-09-30T10:27:26Z
day: '27'
department:
- _id: BjHo
doi: 10.1021/acs.est.4c10551
external_id:
isi:
- '001406914100001'
pmid:
- '39868426'
intvolume: ' 59'
isi: 1
issue: '4'
language:
- iso: eng
month: '01'
oa_version: None
page: 2257-2265
pmid: 1
publication: Environmental Science and Technology
publication_identifier:
eissn:
- 1520-5851
issn:
- 0013-936X
publication_status: published
publisher: American Chemical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Microplastics settling in turbid water: Impacts of sediments-induced flow
patterns on particle deposition rates'
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 59
year: '2025'
...
---
OA_type: closed access
_id: '19035'
abstract:
- lang: eng
text: 'Lagrangian coherent structures (LCSs) are widely recognized as playing a
significant role in turbulence dynamics since they can control the transport of
mass, momentum or heat. However, the methods used to identify these structures
are often based on ambiguous definitions and arbitrary thresholding. While LCSs
theory provides precise and frame-indifferent mathematical definitions of coherent
structures, some of the commonly used extraction algorithms employed in the literature
are still case-specific and involve user-defined parameters. In this study, we
present a new, unsupervised extraction algorithm that enables the extraction of
rotational LCSs based on Lagrangian average vorticity deviation from an arbitrary
3D velocity field. The algorithm utilizes two alternative methods for the identification
of the LCS core (ridge): an unsupervised clustering method and a streamline-based
method. In a subsequent step, the ridge curve is parametrized through a pruning
procedure of minimum spanning tree graphs. To assess the effectiveness of the
algorithm, we test it on two cases: (i) direct numerical simulations of forced
homogeneous and isotropic turbulence and (ii) three-dimensional Particle Tracking
Velocimetry experiments of a turbulent gravity current.'
acknowledgement: M.M.N.H. and M.H. acknowledge financial support from SNSF grant number
200727. M.H. and S.B. acknowledge financial support from the DFG priority program
SPP 1881 Turbulent Superstructures under Grant No. HO5519/1-2.
article_number: '106558'
article_processing_charge: No
article_type: original
author:
- first_name: Marius M.
full_name: Neamtu-Halic, Marius M.
last_name: Neamtu-Halic
- first_name: Stefano
full_name: Brizzolara, Stefano
id: 4bbe33b8-c59a-11ee-a1af-fa33d1ac42c4
last_name: Brizzolara
- first_name: George
full_name: Haller, George
last_name: Haller
- first_name: Markus
full_name: Holzner, Markus
last_name: Holzner
citation:
ama: Neamtu-Halic MM, Brizzolara S, Haller G, Holzner M. Unsupervised extraction
of rotational Lagrangian coherent structures. Computers & Fluids. 2025;290.
doi:10.1016/j.compfluid.2025.106558
apa: Neamtu-Halic, M. M., Brizzolara, S., Haller, G., & Holzner, M. (2025).
Unsupervised extraction of rotational Lagrangian coherent structures. Computers
& Fluids. Elsevier. https://doi.org/10.1016/j.compfluid.2025.106558
chicago: Neamtu-Halic, Marius M., Stefano Brizzolara, George Haller, and Markus
Holzner. “Unsupervised Extraction of Rotational Lagrangian Coherent Structures.”
Computers & Fluids. Elsevier, 2025. https://doi.org/10.1016/j.compfluid.2025.106558.
ieee: M. M. Neamtu-Halic, S. Brizzolara, G. Haller, and M. Holzner, “Unsupervised
extraction of rotational Lagrangian coherent structures,” Computers & Fluids,
vol. 290. Elsevier, 2025.
ista: Neamtu-Halic MM, Brizzolara S, Haller G, Holzner M. 2025. Unsupervised extraction
of rotational Lagrangian coherent structures. Computers & Fluids. 290, 106558.
mla: Neamtu-Halic, Marius M., et al. “Unsupervised Extraction of Rotational Lagrangian
Coherent Structures.” Computers & Fluids, vol. 290, 106558, Elsevier,
2025, doi:10.1016/j.compfluid.2025.106558.
short: M.M. Neamtu-Halic, S. Brizzolara, G. Haller, M. Holzner, Computers &
Fluids 290 (2025).
date_created: 2025-02-17T09:18:41Z
date_published: 2025-03-01T00:00:00Z
date_updated: 2025-09-30T10:34:32Z
day: '01'
department:
- _id: BjHo
doi: 10.1016/j.compfluid.2025.106558
external_id:
isi:
- '001423607400001'
intvolume: ' 290'
isi: 1
language:
- iso: eng
month: '03'
oa_version: None
publication: Computers & Fluids
publication_identifier:
issn:
- 0045-7930
publication_status: published
publisher: Elsevier
quality_controlled: '1'
related_material:
link:
- relation: software
url: https://github.com/NeamtuMarius/Unsupervised-3D-LAVD-Extraction-Algorithm
scopus_import: '1'
status: public
title: Unsupervised extraction of rotational Lagrangian coherent structures
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 290
year: '2025'
...
---
APC_amount: 3599,50 EUR
DOAJ_listed: '1'
OA_place: publisher
OA_type: gold
PlanS_conform: '1'
_id: '20646'
abstract:
- lang: eng
text: Describing general quantum many-body dynamics is a challenging task due to
the exponential growth of the Hilbert space with system size. The time-dependent
variational principle (TDVP) provides a powerful tool to tackle this task by projecting
quantum evolution onto a classical dynamical system within a variational manifold.
In classical systems, periodic orbits play a crucial role in understanding the
structure of the phase space and the long-term behavior of the system. However,
finding periodic orbits is generally difficult, and their existence and properties
in generic TDVP dynamics over matrix product states have remained largely unexplored.
In this work, we develop an algorithm to systematically identify and characterize
periodic orbits in TDVP dynamics. Applying our method to the periodically kicked
Ising model, we uncover both stable and unstable periodic orbits. We characterize
the Kolmogorov-Arnold-Moser tori in the vicinity of stable periodic orbits and
track the change of the periodic orbits as we modify the Hamiltonian parameters.
We observe that periodic orbits exist at any value of the coupling constant of
the kicked Ising model between prethermal and fully thermalizing regimes, but
their relevance to quantum dynamics and imprint on quantum eigenstates diminishes
as the system leaves the prethermal regime. Our results demonstrate that periodic
orbits provide valuable insights into the TDVP approximation of quantum many-body
evolution and establish a closer connection between quantum and classical chaos.
acknowledgement: We acknowledge useful discussions with C. Kollath, A. Green, and
D. Huse. E.P., M.L., and M.S. acknowledge support by the European Research Council
under the European Union’s Horizon 2020 research and innovation program (Grant Agreement
No. 850899). This research was funded in whole or in part by the Austrian Science
Fund (FWF) (Grant No. 10.55776/COE1). For open access purposes, the author has applied
a CC BY public copyright license to any author accepted manuscript version arising
from this submission. M.L. acknowledges support by the Deutsche Forschungsgemeinschaft
(DFG, German Research Foundation) under Germany’s Excellence Strategy—EXC-2111—390814868.
This research was supported in part by National Science Foundation (NSF) Grant No.
PHY-2309135 to the Kavli Institute for Theoretical Physics (KITP) and by the Erwin
Schrödinger International Institute for Mathematics and Physics (ESI).
article_number: '040333'
article_processing_charge: Yes
article_type: original
arxiv: 1
author:
- first_name: Elena
full_name: Petrova, Elena
id: 0ac84990-897b-11ed-a09c-f5abb56a4ede
last_name: Petrova
- first_name: Marko
full_name: Ljubotina, Marko
id: F75EE9BE-5C90-11EA-905D-16643DDC885E
last_name: Ljubotina
orcid: 0000-0003-0038-7068
- first_name: Gökhan
full_name: Yalniz, Gökhan
id: 66E74FA2-D8BF-11E9-8249-8DE2E5697425
last_name: Yalniz
orcid: 0000-0002-8490-9312
- first_name: Maksym
full_name: Serbyn, Maksym
id: 47809E7E-F248-11E8-B48F-1D18A9856A87
last_name: Serbyn
orcid: 0000-0002-2399-5827
citation:
ama: Petrova E, Ljubotina M, Yalniz G, Serbyn M. Finding periodic orbits in projected
quantum many-body dynamics. PRX Quantum. 2025;6(4). doi:10.1103/tldp-kvkd
apa: Petrova, E., Ljubotina, M., Yalniz, G., & Serbyn, M. (2025). Finding periodic
orbits in projected quantum many-body dynamics. PRX Quantum. American Physical
Society. https://doi.org/10.1103/tldp-kvkd
chicago: Petrova, Elena, Marko Ljubotina, Gökhan Yalniz, and Maksym Serbyn. “Finding
Periodic Orbits in Projected Quantum Many-Body Dynamics.” PRX Quantum.
American Physical Society, 2025. https://doi.org/10.1103/tldp-kvkd.
ieee: E. Petrova, M. Ljubotina, G. Yalniz, and M. Serbyn, “Finding periodic orbits
in projected quantum many-body dynamics,” PRX Quantum, vol. 6, no. 4. American
Physical Society, 2025.
ista: Petrova E, Ljubotina M, Yalniz G, Serbyn M. 2025. Finding periodic orbits
in projected quantum many-body dynamics. PRX Quantum. 6(4), 040333.
mla: Petrova, Elena, et al. “Finding Periodic Orbits in Projected Quantum Many-Body
Dynamics.” PRX Quantum, vol. 6, no. 4, 040333, American Physical Society,
2025, doi:10.1103/tldp-kvkd.
short: E. Petrova, M. Ljubotina, G. Yalniz, M. Serbyn, PRX Quantum 6 (2025).
corr_author: '1'
date_created: 2025-11-14T09:40:52Z
date_published: 2025-11-12T00:00:00Z
date_updated: 2026-05-20T07:59:04Z
day: '12'
ddc:
- '539'
department:
- _id: GradSch
- _id: BjHo
- _id: MaSe
doi: 10.1103/tldp-kvkd
ec_funded: 1
external_id:
arxiv:
- '2504.12472'
isi:
- '001616473700003'
file:
- access_level: open_access
checksum: 5d6d04ac518b4118405334e1ddc7a56d
content_type: application/pdf
creator: gyalniz
date_created: 2025-11-14T09:44:10Z
date_updated: 2025-11-14T09:44:10Z
file_id: '20647'
file_name: tldp-kvkd.pdf
file_size: 2504713
relation: main_file
success: 1
file_date_updated: 2025-11-14T09:44:10Z
has_accepted_license: '1'
intvolume: ' 6'
isi: 1
issue: '4'
language:
- iso: eng
month: '11'
oa: 1
oa_version: Published Version
project:
- _id: 23841C26-32DE-11EA-91FC-C7463DDC885E
call_identifier: H2020
grant_number: '850899'
name: 'Non-Ergodic Quantum Matter: Universality, Dynamics and Control'
- _id: 3AC91DDA-15DF-11EA-824D-93A3E7B544D1
call_identifier: FWF
name: FWF Open Access Fund
publication: PRX Quantum
publication_identifier:
eissn:
- 2691-3399
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
related_material:
link:
- description: News on ISTA website
relation: press_release
url: https://ista.ac.at/en/news/reaching-for-the-quantum-scars/
scopus_import: '1'
status: public
title: Finding periodic orbits in projected quantum many-body dynamics
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 6
year: '2025'
...
---
OA_type: closed access
_id: '20928'
abstract:
- lang: eng
text: The current work focuses on the performance of hydrodynamics and mass transfer
in a microchannel. A hydrodynamic model is developed for a gas–liquid (CO2–water)
system and slug flow pattern. For the first time in literature, a concept of pulsating
velocity input is introduced in an enhanced cross-T-junction microchannel to study
the mass transfer using the physical absorption mechanism in ANSYS FLUENT R2 2024.
The mass transfer model is associated with the hydrodynamic model and some user-defined
functions in FLUENT. This work demonstrates that incorporating obstructions and
applying trapezoidal and sinusoidal wave inputs improve the CO2 absorption rate.
The obtained data are further compared with the plain T-junction microchannel
in terms of mass transfer coefficient. Solubility of CO2 in three different solvents
(ethyl alcohol, water, and ethylene glycol) has been revealed in an enhanced cross
T-junction microchannel at two different temperatures, i.e., 298.15 and 303.15 K.
The numerical simulations illustrate that an increase in temperature has an adverse
effect on the mass transfer rate.
acknowledgement: The authors are thankful for the financial support provided by the
Ministry of Education, India, and MNNIT Allahabad, as well as for the necessary
equipment, computing facilities, and overall support to carry out this study.
article_number: '122012'
article_processing_charge: No
article_type: original
author:
- first_name: Bushra
full_name: Khatoon, Bushra
last_name: Khatoon
- first_name: Vikas K.
full_name: Chaudhary, Vikas K.
last_name: Chaudhary
- first_name: Shoaib
full_name: Kamil, Shoaib
id: 185a19af-dc7d-11ea-9b2f-8eb2201959e9
last_name: Kamil
- first_name: Shabih Ul
full_name: Hasan, Shabih Ul
last_name: Hasan
- first_name: M. Siraj
full_name: Alam, M. Siraj
last_name: Alam
citation:
ama: 'Khatoon B, Chaudhary VK, Kamil S, Hasan SU, Alam MS. Enhanced mass transfer
in microgeometry using pulsating velocity inputs: Hydrodynamic analysis and numerical
simulation. Physics of Fluids. 2025;37(12). doi:10.1063/5.0303132'
apa: 'Khatoon, B., Chaudhary, V. K., Kamil, S., Hasan, S. U., & Alam, M. S.
(2025). Enhanced mass transfer in microgeometry using pulsating velocity inputs:
Hydrodynamic analysis and numerical simulation. Physics of Fluids. AIP
Publishing. https://doi.org/10.1063/5.0303132'
chicago: 'Khatoon, Bushra, Vikas K. Chaudhary, Shoaib Kamil, Shabih Ul Hasan, and
M. Siraj Alam. “Enhanced Mass Transfer in Microgeometry Using Pulsating Velocity
Inputs: Hydrodynamic Analysis and Numerical Simulation.” Physics of Fluids.
AIP Publishing, 2025. https://doi.org/10.1063/5.0303132.'
ieee: 'B. Khatoon, V. K. Chaudhary, S. Kamil, S. U. Hasan, and M. S. Alam, “Enhanced
mass transfer in microgeometry using pulsating velocity inputs: Hydrodynamic analysis
and numerical simulation,” Physics of Fluids, vol. 37, no. 12. AIP Publishing,
2025.'
ista: 'Khatoon B, Chaudhary VK, Kamil S, Hasan SU, Alam MS. 2025. Enhanced mass
transfer in microgeometry using pulsating velocity inputs: Hydrodynamic analysis
and numerical simulation. Physics of Fluids. 37(12), 122012.'
mla: 'Khatoon, Bushra, et al. “Enhanced Mass Transfer in Microgeometry Using Pulsating
Velocity Inputs: Hydrodynamic Analysis and Numerical Simulation.” Physics of
Fluids, vol. 37, no. 12, 122012, AIP Publishing, 2025, doi:10.1063/5.0303132.'
short: B. Khatoon, V.K. Chaudhary, S. Kamil, S.U. Hasan, M.S. Alam, Physics of Fluids
37 (2025).
date_created: 2026-01-04T23:01:34Z
date_published: 2025-12-01T00:00:00Z
date_updated: 2026-01-05T10:54:15Z
day: '01'
department:
- _id: BjHo
doi: 10.1063/5.0303132
intvolume: ' 37'
issue: '12'
language:
- iso: eng
month: '12'
oa_version: None
publication: Physics of Fluids
publication_identifier:
eissn:
- 1089-7666
issn:
- 1070-6631
publication_status: published
publisher: AIP Publishing
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Enhanced mass transfer in microgeometry using pulsating velocity inputs: Hydrodynamic
analysis and numerical simulation'
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 37
year: '2025'
...
---
OA_place: publisher
_id: '19906'
abstract:
- lang: eng
text: "Flows of ordinary fluids such as water or air transition from laminar to
turbulent\r\nmotion as the velocity increases. This simple dependence of the flow
state\r\nsolely on inertia, does not apply to more complex substances such as
polymericand biofluids which commonly have elastic as well as viscous properties.
Here\r\nvarious different instabilities and turbulent states can arise at low
and even\r\nvanishing inertia, while high inertia turbulence counterintuitively
is suppressed\r\nand its drag strongly reduced. We here show in experiments of
a viscoelastic\r\nmodel fluid that the phenomena observed at low and high inertia
have a\r\ncommon origin and that the same dynamical state, elasto-inertial turbulence,\r\npersists
across four orders of magnitude in Reynolds number, ranging from\r\nvery low inertia,
all the way to high inertia Maximum drag reduction (MDR)\r\nasymptote. We also
explore the transitions from Newtonian turbulence to\r\nMDR, and specific cases
of flow at high polymer concentrations, exploring the\r\nrelationship between
flow at these wide range of control parameters.\r\n"
acknowledged_ssus:
- _id: M-Shop
acknowledgement: "This work was partially funded by the European Union’s Horizon 2020
research\r\nand innovation programme under the Marie Skłodowska-Curie grant agreement\r\nNo.
665385."
alternative_title:
- ISTA Thesis
article_processing_charge: No
author:
- first_name: Sarath S
full_name: Suresh, Sarath S
id: 3D126CC4-F248-11E8-B48F-1D18A9856A87
last_name: Suresh
citation:
ama: 'Suresh SS. Turbulence in polymeric flows : A characterisation of elasto-inertial
turbulence and the maximum drag reduction asymptote. 2025. doi:10.15479/AT-ISTA-19906'
apa: 'Suresh, S. S. (2025). Turbulence in polymeric flows : A characterisation
of elasto-inertial turbulence and the maximum drag reduction asymptote. Institute
of Science and Technology Austria. https://doi.org/10.15479/AT-ISTA-19906'
chicago: 'Suresh, Sarath S. “Turbulence in Polymeric Flows : A Characterisation
of Elasto-Inertial Turbulence and the Maximum Drag Reduction Asymptote.” Institute
of Science and Technology Austria, 2025. https://doi.org/10.15479/AT-ISTA-19906.'
ieee: 'S. S. Suresh, “Turbulence in polymeric flows : A characterisation of elasto-inertial
turbulence and the maximum drag reduction asymptote,” Institute of Science and
Technology Austria, 2025.'
ista: 'Suresh SS. 2025. Turbulence in polymeric flows : A characterisation of elasto-inertial
turbulence and the maximum drag reduction asymptote. Institute of Science and
Technology Austria.'
mla: 'Suresh, Sarath S. Turbulence in Polymeric Flows : A Characterisation of
Elasto-Inertial Turbulence and the Maximum Drag Reduction Asymptote. Institute
of Science and Technology Austria, 2025, doi:10.15479/AT-ISTA-19906.'
short: 'S.S. Suresh, Turbulence in Polymeric Flows : A Characterisation of Elasto-Inertial
Turbulence and the Maximum Drag Reduction Asymptote, Institute of Science and
Technology Austria, 2025.'
corr_author: '1'
date_created: 2025-06-26T08:39:08Z
date_published: 2025-06-26T00:00:00Z
date_updated: 2026-04-07T12:39:19Z
day: '26'
ddc:
- '530'
degree_awarded: PhD
department:
- _id: GradSch
- _id: BjHo
doi: 10.15479/AT-ISTA-19906
ec_funded: 1
file:
- access_level: open_access
checksum: 302a07605a9e64ac247c2036d5f5b1cd
content_type: application/pdf
creator: cchlebak
date_created: 2025-06-26T08:40:53Z
date_updated: 2025-12-27T23:30:02Z
embargo: 2025-12-27
file_id: '19907'
file_name: Thesis_v9_PDFA2b.pdf
file_size: 6504571
relation: main_file
- access_level: closed
checksum: 5d69d10bdacc24c27f02924379405bd9
content_type: application/x-zip-compressed
creator: cchlebak
date_created: 2025-06-26T08:41:24Z
date_updated: 2025-12-27T23:30:02Z
embargo_to: open_access
file_id: '19908'
file_name: Thesis Template - ISTA [istaustriathesis].zip
file_size: 59092991
relation: source_file
file_date_updated: 2025-12-27T23:30:02Z
has_accepted_license: '1'
language:
- iso: eng
license: https://creativecommons.org/licenses/by-nc-sa/4.0/
month: '06'
oa: 1
oa_version: Published Version
page: '82'
project:
- _id: 2564DBCA-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '665385'
name: International IST Doctoral Program
publication_identifier:
issn:
- 2663-337X
publication_status: published
publisher: Institute of Science and Technology Austria
related_material:
record:
- id: '10299'
relation: part_of_dissertation
status: public
status: public
supervisor:
- first_name: Björn
full_name: Hof, Björn
id: 3A374330-F248-11E8-B48F-1D18A9856A87
last_name: Hof
orcid: 0000-0003-2057-2754
title: 'Turbulence in polymeric flows : A characterisation of elasto-inertial turbulence
and the maximum drag reduction asymptote'
tmp:
image: /images/cc_by_nc_sa.png
legal_code_url: https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode
name: Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC
BY-NC-SA 4.0)
short: CC BY-NC-SA (4.0)
type: dissertation
user_id: ba8df636-2132-11f1-aed0-ed93e2281fdd
year: '2025'
...
---
_id: '17128'
abstract:
- lang: eng
text: The onset of turbulence in pipe flow has defied detailed understanding ever
since the first observations of the spatially heterogeneous nature of the transition.
Recent theoretical studies and experiments in simpler, shear-driven flows suggest
that the onset of turbulence is a directed-percolation non-equilibrium phase transition,
but whether these findings are generic and also apply to open or pressure-driven
flows is unknown. In pipe flow, the extremely long time scales near the transition
make direct observations of critical behaviour virtually impossible. Here we find
a technical solution to that limitation and show that the universality class of
the transition is directed percolation, from which a jammed phase of puffs emerges
above the critical point. Our method is to experimentally characterize all pairwise
interactions between localized patches of turbulence puffs and use these interactions
as input for renormalization group and computer simulations of minimal models
that extrapolate to long length and time scales. The strong interactions in the
jamming regime enable us to explicitly measure the turbulent fraction and confirm
model predictions. Our work shows that directed-percolation scaling applies beyond
simple closed shear flows and underscores how statistical mechanics can lead to
profound, quantitative and predictive insights on turbulent flows and their phases.
acknowledgement: We gratefully acknowledge the assistance of J. M. Lopez with DNSs
at an early stage of this work. This work was partially supported by two grants
from the Simons Foundation (grant nos. 662985 (N.G.) and 662960 (B.H.)) and by Ministry
of Science and Technology, Taiwan (grant nos. MOST 109-2112-M-001-017-MY3 and MOST
111-2112-M-001-027-MY3 (H.-Y.S.)). Part of this work was performed using computing
resources of CRIANN (Normandy, France).
article_processing_charge: No
article_type: original
author:
- first_name: Grégoire M
full_name: Lemoult, Grégoire M
id: 4787FE80-F248-11E8-B48F-1D18A9856A87
last_name: Lemoult
- first_name: Mukund
full_name: Vasudevan, Mukund
id: 3C5A959A-F248-11E8-B48F-1D18A9856A87
last_name: Vasudevan
- first_name: Hong Yan
full_name: Shih, Hong Yan
last_name: Shih
- first_name: Gaute
full_name: Linga, Gaute
last_name: Linga
- first_name: Joachim
full_name: Mathiesen, Joachim
last_name: Mathiesen
- first_name: Nigel
full_name: Goldenfeld, Nigel
last_name: Goldenfeld
- first_name: Björn
full_name: Hof, Björn
id: 3A374330-F248-11E8-B48F-1D18A9856A87
last_name: Hof
orcid: 0000-0003-2057-2754
citation:
ama: Lemoult GM, Vasudevan M, Shih HY, et al. Directed percolation and puff jamming
near the transition to pipe turbulence. Nature Physics. 2024;20:1339-1345.
doi:10.1038/s41567-024-02513-0
apa: Lemoult, G. M., Vasudevan, M., Shih, H. Y., Linga, G., Mathiesen, J., Goldenfeld,
N., & Hof, B. (2024). Directed percolation and puff jamming near the transition
to pipe turbulence. Nature Physics. Springer Nature. https://doi.org/10.1038/s41567-024-02513-0
chicago: Lemoult, Grégoire M, Mukund Vasudevan, Hong Yan Shih, Gaute Linga, Joachim
Mathiesen, Nigel Goldenfeld, and Björn Hof. “Directed Percolation and Puff Jamming
near the Transition to Pipe Turbulence.” Nature Physics. Springer Nature,
2024. https://doi.org/10.1038/s41567-024-02513-0.
ieee: G. M. Lemoult et al., “Directed percolation and puff jamming near the
transition to pipe turbulence,” Nature Physics, vol. 20. Springer Nature,
pp. 1339–1345, 2024.
ista: Lemoult GM, Vasudevan M, Shih HY, Linga G, Mathiesen J, Goldenfeld N, Hof
B. 2024. Directed percolation and puff jamming near the transition to pipe turbulence.
Nature Physics. 20, 1339–1345.
mla: Lemoult, Grégoire M., et al. “Directed Percolation and Puff Jamming near the
Transition to Pipe Turbulence.” Nature Physics, vol. 20, Springer Nature,
2024, pp. 1339–45, doi:10.1038/s41567-024-02513-0.
short: G.M. Lemoult, M. Vasudevan, H.Y. Shih, G. Linga, J. Mathiesen, N. Goldenfeld,
B. Hof, Nature Physics 20 (2024) 1339–1345.
corr_author: '1'
date_created: 2024-06-09T22:01:03Z
date_published: 2024-08-01T00:00:00Z
date_updated: 2025-09-08T07:50:20Z
day: '01'
department:
- _id: BjHo
doi: 10.1038/s41567-024-02513-0
external_id:
isi:
- '001232300600001'
intvolume: ' 20'
isi: 1
language:
- iso: eng
month: '08'
oa_version: None
page: 1339-1345
project:
- _id: 238598C6-32DE-11EA-91FC-C7463DDC885E
grant_number: '662960'
name: Revisiting the Turbulence Problem Using Statistical Mechanics
publication: Nature Physics
publication_identifier:
eissn:
- 1745-2481
issn:
- 1745-2473
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
scopus_import: '1'
status: public
title: Directed percolation and puff jamming near the transition to pipe turbulence
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 20
year: '2024'
...
---
_id: '14466'
abstract:
- lang: eng
text: The first long-lived turbulent structures observable in planar shear flows
take the form of localized stripes, inclined with respect to the mean flow direction.
The dynamics of these stripes is central to transition, and recent studies proposed
an analogy to directed percolation where the stripes’ proliferation is ultimately
responsible for the turbulence becoming sustained. In the present study we focus
on the internal stripe dynamics as well as on the eventual stripe expansion, and
we compare the underlying mechanisms in pressure- and shear-driven planar flows,
respectively, plane-Poiseuille and plane-Couette flow. Despite the similarities
of the overall laminar–turbulence patterns, the stripe proliferation processes
in the two cases are fundamentally different. Starting from the growth and sustenance
of individual stripes, we find that in plane-Couette flow new streaks are created
stochastically throughout the stripe whereas in plane-Poiseuille flow streak creation
is deterministic and occurs locally at the downstream tip. Because of the up/downstream
symmetry, Couette stripes, in contrast to Poiseuille stripes, have two weak and
two strong laminar turbulent interfaces. These differences in symmetry as well
as in internal growth give rise to two fundamentally different stripe splitting
mechanisms. In plane-Poiseuille flow splitting is connected to the elongational
growth of the original stripe, and it results from a break-off/shedding of the
stripe's tail. In plane-Couette flow splitting follows from a broadening of the
original stripe and a division along the stripe into two slimmer stripes.
acknowledgement: E.M. acknowledges funding from the ISTplus fellowship programme.
G.Y. and B.H. acknowledge a grant from the Simons Foundation (662960, BH).
article_number: A21
article_processing_charge: Yes (via OA deal)
article_type: original
arxiv: 1
author:
- first_name: Elena
full_name: Marensi, Elena
id: 0BE7553A-1004-11EA-B805-18983DDC885E
last_name: Marensi
orcid: 0000-0001-7173-4923
- first_name: Gökhan
full_name: Yalniz, Gökhan
id: 66E74FA2-D8BF-11E9-8249-8DE2E5697425
last_name: Yalniz
orcid: 0000-0002-8490-9312
- first_name: Björn
full_name: Hof, Björn
id: 3A374330-F248-11E8-B48F-1D18A9856A87
last_name: Hof
orcid: 0000-0003-2057-2754
citation:
ama: Marensi E, Yalniz G, Hof B. Dynamics and proliferation of turbulent stripes
in plane-Poiseuille and plane-Couette flows. Journal of Fluid Mechanics.
2023;974. doi:10.1017/jfm.2023.780
apa: Marensi, E., Yalniz, G., & Hof, B. (2023). Dynamics and proliferation of
turbulent stripes in plane-Poiseuille and plane-Couette flows. Journal of Fluid
Mechanics. Cambridge University Press. https://doi.org/10.1017/jfm.2023.780
chicago: Marensi, Elena, Gökhan Yalniz, and Björn Hof. “Dynamics and Proliferation
of Turbulent Stripes in Plane-Poiseuille and Plane-Couette Flows.” Journal
of Fluid Mechanics. Cambridge University Press, 2023. https://doi.org/10.1017/jfm.2023.780.
ieee: E. Marensi, G. Yalniz, and B. Hof, “Dynamics and proliferation of turbulent
stripes in plane-Poiseuille and plane-Couette flows,” Journal of Fluid Mechanics,
vol. 974. Cambridge University Press, 2023.
ista: Marensi E, Yalniz G, Hof B. 2023. Dynamics and proliferation of turbulent
stripes in plane-Poiseuille and plane-Couette flows. Journal of Fluid Mechanics.
974, A21.
mla: Marensi, Elena, et al. “Dynamics and Proliferation of Turbulent Stripes in
Plane-Poiseuille and Plane-Couette Flows.” Journal of Fluid Mechanics,
vol. 974, A21, Cambridge University Press, 2023, doi:10.1017/jfm.2023.780.
short: E. Marensi, G. Yalniz, B. Hof, Journal of Fluid Mechanics 974 (2023).
corr_author: '1'
date_created: 2023-10-30T09:32:28Z
date_published: 2023-11-10T00:00:00Z
date_updated: 2026-04-07T11:47:05Z
day: '10'
ddc:
- '530'
department:
- _id: GradSch
- _id: BjHo
doi: 10.1017/jfm.2023.780
external_id:
arxiv:
- '2212.12406'
isi:
- '001088363700001'
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relation: main_file
success: 1
file_date_updated: 2024-02-15T09:05:21Z
has_accepted_license: '1'
intvolume: ' 974'
isi: 1
keyword:
- turbulence
- transition to turbulence
- patterns
language:
- iso: eng
month: '11'
oa: 1
oa_version: Published Version
project:
- _id: 238598C6-32DE-11EA-91FC-C7463DDC885E
grant_number: '662960'
name: Revisiting the Turbulence Problem Using Statistical Mechanics
publication: Journal of Fluid Mechanics
publication_identifier:
eissn:
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issn:
- 0022-1120
publication_status: published
publisher: Cambridge University Press
quality_controlled: '1'
related_material:
record:
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relation: dissertation_contains
status: public
scopus_import: '1'
status: public
title: Dynamics and proliferation of turbulent stripes in plane-Poiseuille and plane-Couette
flows
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 974
year: '2023'
...
---
OA_place: publisher
_id: '14641'
abstract:
- lang: eng
text: "Mutation rates represent the net result of complex interactions among various\r\ncellular
processes and can dramatically influence the evolutionary fate of\r\nmicrobial
populations. However, many popular techniques used to study\r\nmutations are subject
to the confounding effects of heredity and the subtleties\r\nof adaptation to
selection, all of which make it difficult to observe any dynamic\r\nresponses
of mutation rates to fitness challenges. Furthermore, in spite of the\r\nubiquity
of quorum sensing systems across the bacterial domain and relevance\r\nfor many
physiological behaviors, the effects of such mechanisms on mutation\r\nrate and
adaptation remain poorly understood. In the following work, I\r\npresent the development
of a microfluidic droplet-based method to measure\r\nsingle base-pair mutation
rates in growing populations of the bacterium\r\nEscherichia coli. I use this
method to observe a stress-induced increase in\r\nmutation rate that is mediated
by luxS, a highly conserved bacterial quorum\r\nsensing component. I also show
that the aforementioned increase in mutation\r\nrate, and its associated control
by luxS, corresponds to a higher degree of\r\nadaptability under competitive environments."
acknowledged_ssus:
- _id: LifeSc
- _id: Bio
- _id: CampIT
alternative_title:
- ISTA Thesis
article_processing_charge: No
author:
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full_name: Hennessey-Wesen, Mike
id: 3F338C72-F248-11E8-B48F-1D18A9856A87
last_name: Hennessey-Wesen
citation:
ama: Hennessey-Wesen M. Adaptive mutation in E. coli modulated by luxS. 2023. doi:10.15479/at:ista:14641
apa: Hennessey-Wesen, M. (2023). Adaptive mutation in E. coli modulated by luxS.
Institute of Science and Technology Austria. https://doi.org/10.15479/at:ista:14641
chicago: Hennessey-Wesen, Mike. “Adaptive Mutation in E. Coli Modulated by LuxS.”
Institute of Science and Technology Austria, 2023. https://doi.org/10.15479/at:ista:14641.
ieee: M. Hennessey-Wesen, “Adaptive mutation in E. coli modulated by luxS,” Institute
of Science and Technology Austria, 2023.
ista: Hennessey-Wesen M. 2023. Adaptive mutation in E. coli modulated by luxS. Institute
of Science and Technology Austria.
mla: Hennessey-Wesen, Mike. Adaptive Mutation in E. Coli Modulated by LuxS.
Institute of Science and Technology Austria, 2023, doi:10.15479/at:ista:14641.
short: M. Hennessey-Wesen, Adaptive Mutation in E. Coli Modulated by LuxS, Institute
of Science and Technology Austria, 2023.
corr_author: '1'
date_created: 2023-12-04T13:17:37Z
date_published: 2023-11-30T00:00:00Z
date_updated: 2026-04-07T13:29:59Z
day: '30'
ddc:
- '570'
degree_awarded: PhD
department:
- _id: GradSch
- _id: BjHo
doi: 10.15479/at:ista:14641
ec_funded: 1
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file_size: 45847968
relation: other
title: Print version
file_date_updated: 2025-07-17T11:20:25Z
has_accepted_license: '1'
keyword:
- microfluidics
- miceobiology
- mutations
- quorum sensing
language:
- iso: eng
month: '11'
oa_version: Published Version
page: '104'
project:
- _id: 2564DBCA-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '665385'
name: International IST Doctoral Program
publication_identifier:
issn:
- 2663-337X
publication_status: published
publisher: Institute of Science and Technology Austria
status: public
supervisor:
- first_name: Björn
full_name: Hof, Björn
id: 3A374330-F248-11E8-B48F-1D18A9856A87
last_name: Hof
orcid: 0000-0003-2057-2754
title: Adaptive mutation in E. coli modulated by luxS
type: dissertation
user_id: ba8df636-2132-11f1-aed0-ed93e2281fdd
year: '2023'
...
---
_id: '14754'
abstract:
- lang: eng
text: The large-scale laminar/turbulent spiral patterns that appear in the linearly
unstable regime of counter-rotating Taylor–Couette flow are investigated from
a statistical perspective by means of direct numerical simulation. Unlike the
vast majority of previous numerical studies, we analyse the flow in periodic parallelogram-annular
domains, following a coordinate change that aligns one of the parallelogram sides
with the spiral pattern. The domain size, shape and spatial resolution have been
varied and the results compared with those in a sufficiently large computational
orthogonal domain with natural axial and azimuthal periodicity. We find that a
minimal parallelogram of the right tilt significantly reduces the computational
cost without notably compromising the statistical properties of the supercritical
turbulent spiral. Its mean structure, obtained from extremely long time integrations
in a co-rotating reference frame using the method of slices, bears remarkable
similarity with the turbulent stripes observed in plane Couette flow, the centrifugal
instability playing only a secondary role.
acknowledgement: K.D.’s research was supported by Australian Research Council Discovery
Early Career Researcher Award (DE170100171). B.W., R.A., F.M. and A.M. research
was supported by the Spanish Ministerio de Economía y Competitividad (grant nos.
FIS2016-77849-R and FIS2017-85794-P) and Ministerio de Ciencia e Innovación (grant
no. PID2020-114043GB-I00) and the Generalitat de Catalunya (grant no. 2017-SGR-785).
B.W.’s research was also supported by the Chinese Scholarship Council (grant CSC
no. 201806440152). F.M. is a Serra-Húnter Fellow.
article_number: '0112'
article_processing_charge: No
article_type: original
author:
- first_name: B.
full_name: Wang, B.
last_name: Wang
- first_name: F.
full_name: Mellibovsky, F.
last_name: Mellibovsky
- first_name: Roger
full_name: Ayats López, Roger
id: ab77522d-073b-11ed-8aff-e71b39258362
last_name: Ayats López
orcid: 0000-0001-6572-0621
- first_name: K.
full_name: Deguchi, K.
last_name: Deguchi
- first_name: A.
full_name: Meseguer, A.
last_name: Meseguer
citation:
ama: Wang B, Mellibovsky F, Ayats López R, Deguchi K, Meseguer A. Mean structure
of the supercritical turbulent spiral in Taylor–Couette flow. Philosophical
Transactions of the Royal Society A. 2023;381(2246). doi:10.1098/rsta.2022.0112
apa: Wang, B., Mellibovsky, F., Ayats López, R., Deguchi, K., & Meseguer, A.
(2023). Mean structure of the supercritical turbulent spiral in Taylor–Couette
flow. Philosophical Transactions of the Royal Society A. The Royal Society.
https://doi.org/10.1098/rsta.2022.0112
chicago: Wang, B., F. Mellibovsky, Roger Ayats López, K. Deguchi, and A. Meseguer.
“Mean Structure of the Supercritical Turbulent Spiral in Taylor–Couette Flow.”
Philosophical Transactions of the Royal Society A. The Royal Society, 2023.
https://doi.org/10.1098/rsta.2022.0112.
ieee: B. Wang, F. Mellibovsky, R. Ayats López, K. Deguchi, and A. Meseguer, “Mean
structure of the supercritical turbulent spiral in Taylor–Couette flow,” Philosophical
Transactions of the Royal Society A, vol. 381, no. 2246. The Royal Society,
2023.
ista: Wang B, Mellibovsky F, Ayats López R, Deguchi K, Meseguer A. 2023. Mean structure
of the supercritical turbulent spiral in Taylor–Couette flow. Philosophical Transactions
of the Royal Society A. 381(2246), 0112.
mla: Wang, B., et al. “Mean Structure of the Supercritical Turbulent Spiral in Taylor–Couette
Flow.” Philosophical Transactions of the Royal Society A, vol. 381, no.
2246, 0112, The Royal Society, 2023, doi:10.1098/rsta.2022.0112.
short: B. Wang, F. Mellibovsky, R. Ayats López, K. Deguchi, A. Meseguer, Philosophical
Transactions of the Royal Society A 381 (2023).
date_created: 2024-01-08T13:11:45Z
date_published: 2023-05-01T00:00:00Z
date_updated: 2025-09-09T14:14:17Z
day: '01'
ddc:
- '530'
department:
- _id: BjHo
doi: 10.1098/rsta.2022.0112
external_id:
isi:
- '000947761800008'
pmid:
- '36907214'
file:
- access_level: open_access
checksum: 1978d126c0ce2f47c22ac20107cc0106
content_type: application/pdf
creator: dernst
date_created: 2024-01-09T09:13:53Z
date_updated: 2024-01-09T09:13:53Z
file_id: '14763'
file_name: 2023_PhilTransactionsA_Wang_accepted.pdf
file_size: 6421086
relation: main_file
success: 1
file_date_updated: 2024-01-09T09:13:53Z
has_accepted_license: '1'
intvolume: ' 381'
isi: 1
issue: '2246'
keyword:
- General Physics and Astronomy
- General Engineering
- General Mathematics
language:
- iso: eng
month: '05'
oa: 1
oa_version: Submitted Version
pmid: 1
publication: Philosophical Transactions of the Royal Society A
publication_identifier:
eissn:
- 1471-2962
issn:
- 1364-503X
publication_status: published
publisher: The Royal Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Mean structure of the supercritical turbulent spiral in Taylor–Couette flow
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 381
year: '2023'
...
---
_id: '12105'
abstract:
- lang: eng
text: Data-driven dimensionality reduction methods such as proper orthogonal decomposition
and dynamic mode decomposition have proven to be useful for exploring complex
phenomena within fluid dynamics and beyond. A well-known challenge for these techniques
is posed by the continuous symmetries, e.g. translations and rotations, of the
system under consideration, as drifts in the data dominate the modal expansions
without providing an insight into the dynamics of the problem. In the present
study, we address this issue for fluid flows in rectangular channels by formulating
a continuous symmetry reduction method that eliminates the translations in the
streamwise and spanwise directions simultaneously. We demonstrate our method by
computing the symmetry-reduced dynamic mode decomposition (SRDMD) of sliding windows
of data obtained from the transitional plane-Couette and turbulent plane-Poiseuille
flow simulations. In the former setting, SRDMD captures the dynamics in the vicinity
of the invariant solutions with translation symmetries, i.e. travelling waves
and relative periodic orbits, whereas in the latter, our calculations reveal episodes
of turbulent time evolution that can be approximated by a low-dimensional linear
expansion.
acknowledgement: "E.M. acknowledges funding from the ISTplus fellowship programme.
G.Y. and B.H. acknowledge\r\na grant from the Simons Foundation (662960, BH)."
article_number: A10
article_processing_charge: Yes (via OA deal)
article_type: original
arxiv: 1
author:
- first_name: Elena
full_name: Marensi, Elena
id: 0BE7553A-1004-11EA-B805-18983DDC885E
last_name: Marensi
orcid: 0000-0001-7173-4923
- first_name: Gökhan
full_name: Yalniz, Gökhan
id: 66E74FA2-D8BF-11E9-8249-8DE2E5697425
last_name: Yalniz
orcid: 0000-0002-8490-9312
- first_name: Björn
full_name: Hof, Björn
id: 3A374330-F248-11E8-B48F-1D18A9856A87
last_name: Hof
orcid: 0000-0003-2057-2754
- first_name: Nazmi B
full_name: Budanur, Nazmi B
id: 3EA1010E-F248-11E8-B48F-1D18A9856A87
last_name: Budanur
orcid: 0000-0003-0423-5010
citation:
ama: Marensi E, Yalniz G, Hof B, Budanur NB. Symmetry-reduced dynamic mode decomposition
of near-wall turbulence. Journal of Fluid Mechanics. 2023;954. doi:10.1017/jfm.2022.1001
apa: Marensi, E., Yalniz, G., Hof, B., & Budanur, N. B. (2023). Symmetry-reduced
dynamic mode decomposition of near-wall turbulence. Journal of Fluid Mechanics.
Cambridge University Press. https://doi.org/10.1017/jfm.2022.1001
chicago: Marensi, Elena, Gökhan Yalniz, Björn Hof, and Nazmi B Budanur. “Symmetry-Reduced
Dynamic Mode Decomposition of near-Wall Turbulence.” Journal of Fluid Mechanics.
Cambridge University Press, 2023. https://doi.org/10.1017/jfm.2022.1001.
ieee: E. Marensi, G. Yalniz, B. Hof, and N. B. Budanur, “Symmetry-reduced dynamic
mode decomposition of near-wall turbulence,” Journal of Fluid Mechanics,
vol. 954. Cambridge University Press, 2023.
ista: Marensi E, Yalniz G, Hof B, Budanur NB. 2023. Symmetry-reduced dynamic mode
decomposition of near-wall turbulence. Journal of Fluid Mechanics. 954, A10.
mla: Marensi, Elena, et al. “Symmetry-Reduced Dynamic Mode Decomposition of near-Wall
Turbulence.” Journal of Fluid Mechanics, vol. 954, A10, Cambridge University
Press, 2023, doi:10.1017/jfm.2022.1001.
short: E. Marensi, G. Yalniz, B. Hof, N.B. Budanur, Journal of Fluid Mechanics 954
(2023).
corr_author: '1'
date_created: 2023-01-08T23:00:53Z
date_published: 2023-01-10T00:00:00Z
date_updated: 2026-04-07T11:47:05Z
day: '10'
ddc:
- '530'
department:
- _id: BjHo
doi: 10.1017/jfm.2022.1001
external_id:
arxiv:
- '2101.07516'
isi:
- '000903336600001'
file:
- access_level: open_access
checksum: 9224f987caefe5dd85a70814d3cce65c
content_type: application/pdf
creator: dernst
date_created: 2023-02-02T12:34:54Z
date_updated: 2023-02-02T12:34:54Z
file_id: '12489'
file_name: 2023_JourFluidMechanics_Marensi.pdf
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file_date_updated: 2023-02-02T12:34:54Z
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intvolume: ' 954'
isi: 1
language:
- iso: eng
month: '01'
oa: 1
oa_version: Published Version
project:
- _id: 238598C6-32DE-11EA-91FC-C7463DDC885E
grant_number: '662960'
name: Revisiting the Turbulence Problem Using Statistical Mechanics
publication: Journal of Fluid Mechanics
publication_identifier:
eissn:
- 1469-7645
issn:
- 0022-1120
publication_status: published
publisher: Cambridge University Press
quality_controlled: '1'
related_material:
record:
- id: '19684'
relation: dissertation_contains
status: public
scopus_import: '1'
status: public
title: Symmetry-reduced dynamic mode decomposition of near-wall turbulence
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 954
year: '2023'
...
---
_id: '12165'
abstract:
- lang: eng
text: It may come as a surprise that a phenomenon as ubiquitous and prominent as
the transition from laminar to turbulent flow has resisted combined efforts by
physicists, engineers and mathematicians, and remained unresolved for almost one
and a half centuries. In recent years, various studies have proposed analogies
to directed percolation, a well-known universality class in statistical mechanics,
which describes a non-equilibrium phase transition from a fluctuating active phase
into an absorbing state. It is this unlikely relation between the multiscale,
high-dimensional dynamics that signify the transition process in virtually all
flows of practical relevance, and the arguably most basic non-equilibrium phase
transition, that so far has mainly been the subject of model studies, which I
review in this Perspective.
article_processing_charge: No
article_type: original
author:
- first_name: Björn
full_name: Hof, Björn
id: 3A374330-F248-11E8-B48F-1D18A9856A87
last_name: Hof
orcid: 0000-0003-2057-2754
citation:
ama: Hof B. Directed percolation and the transition to turbulence. Nature Reviews
Physics. 2023;5:62-72. doi:10.1038/s42254-022-00539-y
apa: Hof, B. (2023). Directed percolation and the transition to turbulence. Nature
Reviews Physics. Springer Nature. https://doi.org/10.1038/s42254-022-00539-y
chicago: Hof, Björn. “Directed Percolation and the Transition to Turbulence.” Nature
Reviews Physics. Springer Nature, 2023. https://doi.org/10.1038/s42254-022-00539-y.
ieee: B. Hof, “Directed percolation and the transition to turbulence,” Nature
Reviews Physics, vol. 5. Springer Nature, pp. 62–72, 2023.
ista: Hof B. 2023. Directed percolation and the transition to turbulence. Nature
Reviews Physics. 5, 62–72.
mla: Hof, Björn. “Directed Percolation and the Transition to Turbulence.” Nature
Reviews Physics, vol. 5, Springer Nature, 2023, pp. 62–72, doi:10.1038/s42254-022-00539-y.
short: B. Hof, Nature Reviews Physics 5 (2023) 62–72.
corr_author: '1'
date_created: 2023-01-12T12:10:18Z
date_published: 2023-01-01T00:00:00Z
date_updated: 2024-10-09T21:04:02Z
day: '01'
department:
- _id: BjHo
doi: 10.1038/s42254-022-00539-y
external_id:
isi:
- '000890148700002'
intvolume: ' 5'
isi: 1
keyword:
- General Physics and Astronomy
language:
- iso: eng
month: '01'
oa_version: None
page: 62-72
publication: Nature Reviews Physics
publication_identifier:
eissn:
- 2522-5820
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
scopus_import: '1'
status: public
title: Directed percolation and the transition to turbulence
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 5
year: '2023'
...
---
_id: '12172'
abstract:
- lang: eng
text: In industrial reactors and equipment, non-ideality is quite a common phenomenon
rather than an exception. These deviations from ideality impact the process's
overall efficiency and the effectiveness of the equipment. To recognize the associated
non-ideality, one needs to have enough understanding of the formulation of the
equations and in-depth knowledge of the residence time distribution (RTD) data
of real reactors. In the current work, step input and pulse input were used to
create RTD data for Cascade continuous stirred tank reactors (CSTRs). For the
aforementioned configuration, experiments were run at various flow rates to validate
the developed characteristic equations. To produce RTD data, distilled water was
utilized as the flowing fluid, and NaOH was the tracer substance. The ideal behavior
of tracer concentration exits age distribution, and cumulative fraction for each
setup and each input was plotted and experimental results were compared with perfect
behavior. Deviation of concentration exit age distribution and cumulative fractional
distribution from ideal behavior is more in pulse input as compared to a step
input. For ideal cases, the exit age distribution curve and cumulative fraction
curves are independent of the type of input. But a significant difference was
observed for the two cases, which may be due to non-measurable fluctuations in
volumetric flow rate, non-achievement of instant injection of tracer in case of
pulse input, and slight variations in the sampling period. Further, with increasing
flow rate, concentration, exit age, and cumulative fractional curves shifted upward,
and this behavior matches with the actual case.
article_processing_charge: No
article_type: original
author:
- first_name: Bushra
full_name: Khatoon, Bushra
last_name: Khatoon
- first_name: Shoaib
full_name: Kamil, Shoaib
id: 185a19af-dc7d-11ea-9b2f-8eb2201959e9
last_name: Kamil
- first_name: Hitesh
full_name: Babu, Hitesh
last_name: Babu
- first_name: M.
full_name: Siraj Alam, M.
last_name: Siraj Alam
citation:
ama: 'Khatoon B, Kamil S, Babu H, Siraj Alam M. Experimental analysis of Cascade
CSTRs with step and pulse inputs. Materials Today: Proceedings. 2023;78(Part
1):40-47. doi:10.1016/j.matpr.2022.11.037'
apa: 'Khatoon, B., Kamil, S., Babu, H., & Siraj Alam, M. (2023). Experimental
analysis of Cascade CSTRs with step and pulse inputs. Materials Today: Proceedings.
Elsevier. https://doi.org/10.1016/j.matpr.2022.11.037'
chicago: 'Khatoon, Bushra, Shoaib Kamil, Hitesh Babu, and M. Siraj Alam. “Experimental
Analysis of Cascade CSTRs with Step and Pulse Inputs.” Materials Today: Proceedings.
Elsevier, 2023. https://doi.org/10.1016/j.matpr.2022.11.037.'
ieee: 'B. Khatoon, S. Kamil, H. Babu, and M. Siraj Alam, “Experimental analysis
of Cascade CSTRs with step and pulse inputs,” Materials Today: Proceedings,
vol. 78, no. Part 1. Elsevier, pp. 40–47, 2023.'
ista: 'Khatoon B, Kamil S, Babu H, Siraj Alam M. 2023. Experimental analysis of
Cascade CSTRs with step and pulse inputs. Materials Today: Proceedings. 78(Part
1), 40–47.'
mla: 'Khatoon, Bushra, et al. “Experimental Analysis of Cascade CSTRs with Step
and Pulse Inputs.” Materials Today: Proceedings, vol. 78, no. Part 1, Elsevier,
2023, pp. 40–47, doi:10.1016/j.matpr.2022.11.037.'
short: 'B. Khatoon, S. Kamil, H. Babu, M. Siraj Alam, Materials Today: Proceedings
78 (2023) 40–47.'
date_created: 2023-01-12T12:11:26Z
date_published: 2023-03-20T00:00:00Z
date_updated: 2023-08-16T09:08:11Z
day: '20'
department:
- _id: BjHo
doi: 10.1016/j.matpr.2022.11.037
intvolume: ' 78'
issue: Part 1
keyword:
- General Medicine
language:
- iso: eng
month: '03'
oa_version: None
page: 40-47
publication: 'Materials Today: Proceedings'
publication_identifier:
issn:
- 2214-7853
publication_status: published
publisher: Elsevier
quality_controlled: '1'
scopus_import: '1'
status: public
title: Experimental analysis of Cascade CSTRs with step and pulse inputs
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 78
year: '2023'
...
---
_id: '12681'
abstract:
- lang: eng
text: The dissolution of minute concentration of polymers in wall-bounded flows
is well-known for its unparalleled ability to reduce turbulent friction drag.
Another phenomenon, elasto-inertial turbulence (EIT), has been far less studied
even though elastic instabilities have already been observed in dilute polymer
solutions before the discovery of polymer drag reduction. EIT is a chaotic state
driven by polymer dynamics that is observed across many orders of magnitude in
Reynolds number. It involves energy transfer from small elastic scales to large
flow scales. The investigation of the mechanisms of EIT offers the possibility
to better understand other complex phenomena such as elastic turbulence and maximum
drag reduction. In this review, we survey recent research efforts that are advancing
the understanding of the dynamics of EIT. We highlight the fundamental differences
between EIT and Newtonian/inertial turbulence from the perspective of experiments,
numerical simulations, instabilities, and coherent structures. Finally, we discuss
the possible links between EIT and elastic turbulence and polymer drag reduction,
as well as the remaining challenges in unraveling the self-sustaining mechanism
of EIT.
acknowledgement: Part of the material presented here is based upon work supported
by the National Science Foundation CBET (Chemical, Bioengineering, Environmental
and Transport Systems) award 1805636 (to Y.D.), the Binational Science Foundation
award 2016145 (to Y.D. and Victor Steinberg), a FRIA (Fund for Research Training
in Industry and Agriculture) grant of the Belgian F.R.S.-FNRS (National Fund for
Scientific Research) (to V.E.T.), the Marie Curie FP7 Career Integration grant PCIG10-GA-2011-304073
(to V.E.T.), and the Fonds spéciaux pour la recherche grant C-13/19 of the University
of Liege (to V.E.T.). Computational resources have been provided by the Consortium
des Équipements de Calcul Intensif (CECI) funded by the Belgian F.R.S.-FNRS, the
Vermont Advanced Computing Center (VACC), the Partnership for Advanced Computing
in Europe (PRACE), and the Tier-1 supercomputer of the Fédération Wallonie-Bruxelles
funded by the Walloon Region (grant agreement 117545).
article_processing_charge: No
article_type: original
author:
- first_name: Yves
full_name: Dubief, Yves
last_name: Dubief
- first_name: Vincent E.
full_name: Terrapon, Vincent E.
last_name: Terrapon
- first_name: Björn
full_name: Hof, Björn
id: 3A374330-F248-11E8-B48F-1D18A9856A87
last_name: Hof
orcid: 0000-0003-2057-2754
citation:
ama: Dubief Y, Terrapon VE, Hof B. Elasto-inertial turbulence. Annual Review
of Fluid Mechanics. 2023;55(1):675-705. doi:10.1146/annurev-fluid-032822-025933
apa: Dubief, Y., Terrapon, V. E., & Hof, B. (2023). Elasto-inertial turbulence.
Annual Review of Fluid Mechanics. Annual Reviews. https://doi.org/10.1146/annurev-fluid-032822-025933
chicago: Dubief, Yves, Vincent E. Terrapon, and Björn Hof. “Elasto-Inertial Turbulence.”
Annual Review of Fluid Mechanics. Annual Reviews, 2023. https://doi.org/10.1146/annurev-fluid-032822-025933.
ieee: Y. Dubief, V. E. Terrapon, and B. Hof, “Elasto-inertial turbulence,” Annual
Review of Fluid Mechanics, vol. 55, no. 1. Annual Reviews, pp. 675–705, 2023.
ista: Dubief Y, Terrapon VE, Hof B. 2023. Elasto-inertial turbulence. Annual Review
of Fluid Mechanics. 55(1), 675–705.
mla: Dubief, Yves, et al. “Elasto-Inertial Turbulence.” Annual Review of Fluid
Mechanics, vol. 55, no. 1, Annual Reviews, 2023, pp. 675–705, doi:10.1146/annurev-fluid-032822-025933.
short: Y. Dubief, V.E. Terrapon, B. Hof, Annual Review of Fluid Mechanics 55 (2023)
675–705.
date_created: 2023-02-26T23:01:01Z
date_published: 2023-01-19T00:00:00Z
date_updated: 2023-08-01T13:19:47Z
day: '19'
ddc:
- '530'
department:
- _id: BjHo
doi: 10.1146/annurev-fluid-032822-025933
external_id:
isi:
- '000915418100026'
file:
- access_level: open_access
checksum: 2666aa3af2a25252d35eb8681d3edff7
content_type: application/pdf
creator: dernst
date_created: 2023-02-27T09:23:02Z
date_updated: 2023-02-27T09:23:02Z
file_id: '12690'
file_name: 2023_AnnReviewFluidMech_Dubief.pdf
file_size: 4036706
relation: main_file
success: 1
file_date_updated: 2023-02-27T09:23:02Z
has_accepted_license: '1'
intvolume: ' 55'
isi: 1
issue: '1'
language:
- iso: eng
month: '01'
oa: 1
oa_version: Published Version
page: 675-705
publication: Annual Review of Fluid Mechanics
publication_identifier:
eissn:
- 1545-4479
issn:
- 0066-4189
publication_status: published
publisher: Annual Reviews
quality_controlled: '1'
scopus_import: '1'
status: public
title: Elasto-inertial turbulence
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 55
year: '2023'
...