---
_id: '5996'
abstract:
- lang: eng
text: 'In pipes, turbulence sets in despite the linear stability of the laminar
Hagen–Poiseuille flow. The Reynolds number ( ) for which turbulence first appears
in a given experiment – the ‘natural transition point’ – depends on imperfections
of the set-up, or, more precisely, on the magnitude of finite amplitude perturbations.
At onset, turbulence typically only occupies a certain fraction of the flow, and
this fraction equally is found to differ from experiment to experiment. Despite
these findings, Reynolds proposed that after sufficiently long times, flows may
settle to steady conditions: below a critical velocity, flows should (regardless
of initial conditions) always return to laminar, while above this velocity, eddying
motion should persist. As will be shown, even in pipes several thousand diameters
long, the spatio-temporal intermittent flow patterns observed at the end of the
pipe strongly depend on the initial conditions, and there is no indication that
different flow patterns would eventually settle to a (statistical) steady state.
Exploiting the fact that turbulent puffs do not age (i.e. they are memoryless),
we continuously recreate the puff sequence exiting the pipe at the pipe entrance,
and in doing so introduce periodic boundary conditions for the puff pattern. This
procedure allows us to study the evolution of the flow patterns for arbitrary
long times, and we find that after times in excess of advective time units, indeed
a statistical steady state is reached. Although the resulting flows remain spatio-temporally
intermittent, puff splitting and decay rates eventually reach a balance, so that
the turbulent fraction fluctuates around a well-defined level which only depends
on . In accordance with Reynolds’ proposition, we find that at lower (here 2020),
flows eventually always resume to laminar, while for higher ( ), turbulence persists.
The critical point for pipe flow hence falls in the interval of $2020 , which
is in very good agreement with the recently proposed value of . The latter estimate
was based on single-puff statistics and entirely neglected puff interactions.
Unlike in typical contact processes where such interactions strongly affect the
percolation threshold, in pipe flow, the critical point is only marginally influenced.
Interactions, on the other hand, are responsible for the approach to the statistical
steady state. As shown, they strongly affect the resulting flow patterns, where
they cause ‘puff clustering’, and these regions of large puff densities are observed
to travel across the puff pattern in a wave-like fashion.'
acknowledgement: ' We also thank Philipp Maier and the IST Austria workshop for theirdedicated
technical support'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Mukund
full_name: Vasudevan, Mukund
id: 3C5A959A-F248-11E8-B48F-1D18A9856A87
last_name: Vasudevan
- 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, Hof B. The critical point of the transition to turbulence in pipe
flow. Journal of Fluid Mechanics. 2018;839:76-94. doi:10.1017/jfm.2017.923
apa: Vasudevan, M., & Hof, B. (2018). The critical point of the transition to
turbulence in pipe flow. Journal of Fluid Mechanics. Cambridge University
Press. https://doi.org/10.1017/jfm.2017.923
chicago: Vasudevan, Mukund, and Björn Hof. “The Critical Point of the Transition
to Turbulence in Pipe Flow.” Journal of Fluid Mechanics. Cambridge University
Press, 2018. https://doi.org/10.1017/jfm.2017.923.
ieee: M. Vasudevan and B. Hof, “The critical point of the transition to turbulence
in pipe flow,” Journal of Fluid Mechanics, vol. 839. Cambridge University
Press, pp. 76–94, 2018.
ista: Vasudevan M, Hof B. 2018. The critical point of the transition to turbulence
in pipe flow. Journal of Fluid Mechanics. 839, 76–94.
mla: Vasudevan, Mukund, and Björn Hof. “The Critical Point of the Transition to
Turbulence in Pipe Flow.” Journal of Fluid Mechanics, vol. 839, Cambridge
University Press, 2018, pp. 76–94, doi:10.1017/jfm.2017.923.
short: M. Vasudevan, B. Hof, Journal of Fluid Mechanics 839 (2018) 76–94.
date_created: 2019-02-14T12:50:50Z
date_published: 2018-03-25T00:00:00Z
date_updated: 2023-09-19T14:37:49Z
day: '25'
department:
- _id: BjHo
doi: 10.1017/jfm.2017.923
ec_funded: 1
external_id:
arxiv:
- '1709.06372'
isi:
- '000437858300003'
intvolume: ' 839'
isi: 1
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1709.06372
month: '03'
oa: 1
oa_version: Preprint
page: 76-94
project:
- _id: 25152F3A-B435-11E9-9278-68D0E5697425
call_identifier: FP7
grant_number: '306589'
name: Decoding the complexity of turbulence at its origin
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: The critical point of the transition to turbulence in pipe flow
type: journal_article
user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1
volume: 839
year: '2018'
...
---
_id: '16'
abstract:
- lang: eng
text: We report quantitative evidence of mixing-layer elastic instability in a viscoelastic
fluid flow between two widely spaced obstacles hindering a channel flow at Re
1 and Wi 1. Two mixing layers with nonuniform shear velocity profiles are formed
in the region between the obstacles. The mixing-layer instability arises in the
vicinity of an inflection point on the shear velocity profile with a steep variation
in the elastic stress. The instability results in an intermittent appearance of
small vortices in the mixing layers and an amplification of spatiotemporal averaged
vorticity in the elastic turbulence regime. The latter is characterized through
scaling of friction factor with Wi and both pressure and velocity spectra. Furthermore,
the observations reported provide improved understanding of the stability of the
mixing layer in a viscoelastic fluid at large elasticity, i.e., Wi 1 and Re 1
and oppose the current view of suppression of vorticity solely by polymer additives.
acknowledgement: This work was partially supported by the Israel Science Foundation
(ISF; Grant No. 882/15) and the Binational USA-Israel Foundation (BSF; Grant No.
2016145).
article_number: '103303'
article_processing_charge: No
article_type: original
author:
- first_name: Atul
full_name: Varshney, Atul
id: 2A2006B2-F248-11E8-B48F-1D18A9856A87
last_name: Varshney
orcid: 0000-0002-3072-5999
- first_name: Victor
full_name: Steinberg, Victor
last_name: Steinberg
citation:
ama: Varshney A, Steinberg V. Mixing layer instability and vorticity amplification
in a creeping viscoelastic flow. Physical Review Fluids. 2018;3(10). doi:10.1103/PhysRevFluids.3.103303
apa: Varshney, A., & Steinberg, V. (2018). Mixing layer instability and vorticity
amplification in a creeping viscoelastic flow. Physical Review Fluids.
American Physical Society. https://doi.org/10.1103/PhysRevFluids.3.103303
chicago: Varshney, Atul, and Victor Steinberg. “Mixing Layer Instability and Vorticity
Amplification in a Creeping Viscoelastic Flow.” Physical Review Fluids.
American Physical Society, 2018. https://doi.org/10.1103/PhysRevFluids.3.103303.
ieee: A. Varshney and V. Steinberg, “Mixing layer instability and vorticity amplification
in a creeping viscoelastic flow,” Physical Review Fluids, vol. 3, no. 10.
American Physical Society, 2018.
ista: Varshney A, Steinberg V. 2018. Mixing layer instability and vorticity amplification
in a creeping viscoelastic flow. Physical Review Fluids. 3(10), 103303.
mla: Varshney, Atul, and Victor Steinberg. “Mixing Layer Instability and Vorticity
Amplification in a Creeping Viscoelastic Flow.” Physical Review Fluids,
vol. 3, no. 10, 103303, American Physical Society, 2018, doi:10.1103/PhysRevFluids.3.103303.
short: A. Varshney, V. Steinberg, Physical Review Fluids 3 (2018).
date_created: 2018-12-11T11:44:10Z
date_published: 2018-10-16T00:00:00Z
date_updated: 2023-09-13T08:57:05Z
day: '16'
ddc:
- '532'
department:
- _id: BjHo
doi: 10.1103/PhysRevFluids.3.103303
ec_funded: 1
external_id:
isi:
- '000447469200001'
file:
- access_level: open_access
checksum: 7fc0a2322214d1c04debef36d5bf2e8a
content_type: application/pdf
creator: system
date_created: 2018-12-12T10:13:56Z
date_updated: 2020-07-14T12:45:04Z
file_id: '5043'
file_name: IST-2018-1062-v1+1_PhysRevFluids.3.103303.pdf
file_size: 1838431
relation: main_file
file_date_updated: 2020-07-14T12:45:04Z
has_accepted_license: '1'
intvolume: ' 3'
isi: 1
issue: '10'
language:
- iso: eng
month: '10'
oa: 1
oa_version: Submitted Version
project:
- _id: 260C2330-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '754411'
name: ISTplus - Postdoctoral Fellowships
publication: Physical Review Fluids
publication_status: published
publisher: American Physical Society
publist_id: '8039'
pubrep_id: '1062'
quality_controlled: '1'
scopus_import: '1'
status: public
title: Mixing layer instability and vorticity amplification in a creeping viscoelastic
flow
type: journal_article
user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1
volume: 3
year: '2018'
...
---
_id: '136'
abstract:
- lang: eng
text: Recent studies suggest that unstable, nonchaotic solutions of the Navier-Stokes
equation may provide deep insights into fluid turbulence. In this article, we
present a combined experimental and numerical study exploring the dynamical role
of unstable equilibrium solutions and their invariant manifolds in a weakly turbulent,
electromagnetically driven, shallow fluid layer. Identifying instants when turbulent
evolution slows down, we compute 31 unstable equilibria of a realistic two-dimensional
model of the flow. We establish the dynamical relevance of these unstable equilibria
by showing that they are closely visited by the turbulent flow. We also establish
the dynamical relevance of unstable manifolds by verifying that they are shadowed
by turbulent trajectories departing from the neighborhoods of unstable equilibria
over large distances in state space.
article_processing_charge: No
arxiv: 1
author:
- first_name: Balachandra
full_name: Suri, Balachandra
id: 47A5E706-F248-11E8-B48F-1D18A9856A87
last_name: Suri
- first_name: Jeffrey
full_name: Tithof, Jeffrey
last_name: Tithof
- first_name: Roman
full_name: Grigoriev, Roman
last_name: Grigoriev
- first_name: Michael
full_name: Schatz, Michael
last_name: Schatz
citation:
ama: Suri B, Tithof J, Grigoriev R, Schatz M. Unstable equilibria and invariant
manifolds in quasi-two-dimensional Kolmogorov-like flow. Physical Review E.
2018;98(2). doi:10.1103/PhysRevE.98.023105
apa: Suri, B., Tithof, J., Grigoriev, R., & Schatz, M. (2018). Unstable equilibria
and invariant manifolds in quasi-two-dimensional Kolmogorov-like flow. Physical
Review E. American Physical Society. https://doi.org/10.1103/PhysRevE.98.023105
chicago: Suri, Balachandra, Jeffrey Tithof, Roman Grigoriev, and Michael Schatz.
“Unstable Equilibria and Invariant Manifolds in Quasi-Two-Dimensional Kolmogorov-like
Flow.” Physical Review E. American Physical Society, 2018. https://doi.org/10.1103/PhysRevE.98.023105.
ieee: B. Suri, J. Tithof, R. Grigoriev, and M. Schatz, “Unstable equilibria and
invariant manifolds in quasi-two-dimensional Kolmogorov-like flow,” Physical
Review E, vol. 98, no. 2. American Physical Society, 2018.
ista: Suri B, Tithof J, Grigoriev R, Schatz M. 2018. Unstable equilibria and invariant
manifolds in quasi-two-dimensional Kolmogorov-like flow. Physical Review E. 98(2).
mla: Suri, Balachandra, et al. “Unstable Equilibria and Invariant Manifolds in Quasi-Two-Dimensional
Kolmogorov-like Flow.” Physical Review E, vol. 98, no. 2, American Physical
Society, 2018, doi:10.1103/PhysRevE.98.023105.
short: B. Suri, J. Tithof, R. Grigoriev, M. Schatz, Physical Review E 98 (2018).
date_created: 2018-12-11T11:44:49Z
date_published: 2018-08-13T00:00:00Z
date_updated: 2023-10-10T13:29:10Z
day: '13'
department:
- _id: BjHo
doi: 10.1103/PhysRevE.98.023105
external_id:
arxiv:
- '1808.02088'
isi:
- '000441466800010'
intvolume: ' 98'
isi: 1
issue: '2'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1808.02088
month: '08'
oa: 1
oa_version: Submitted Version
publication: Physical Review E
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Unstable equilibria and invariant manifolds in quasi-two-dimensional Kolmogorov-like
flow
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 98
year: '2018'
...
---
_id: '422'
abstract:
- lang: eng
text: We show that a rather simple, steady modification of the streamwise velocity
profile in a pipe can lead to a complete collapse of turbulence and the flow fully
relaminarizes. Two different devices, a stationary obstacle (inset) and a device
which injects fluid through an annular gap close to the wall, are used to control
the flow. Both devices modify the streamwise velocity profile such that the flow
in the center of the pipe is decelerated and the flow in the near wall region
is accelerated. We present measurements with stereoscopic particle image velocimetry
to investigate and capture the development of the relaminarizing flow downstream
these devices and the specific circumstances responsible for relaminarization.
We find total relaminarization up to Reynolds numbers of 6000, where the skin
friction in the far downstream distance is reduced by a factor of 3.4 due to relaminarization.
In a smooth straight pipe the flow remains completely laminar downstream of the
control. Furthermore, we show that transient (temporary) relaminarization in a
spatially confined region right downstream the devices occurs also at much higher
Reynolds numbers, accompanied by a significant local skin friction drag reduction.
The underlying physical mechanism of relaminarization is attributed to a weakening
of the near-wall turbulence production cycle.
article_processing_charge: Yes (via OA deal)
author:
- first_name: Jakob
full_name: Kühnen, Jakob
id: 3A47AE32-F248-11E8-B48F-1D18A9856A87
last_name: Kühnen
orcid: 0000-0003-4312-0179
- first_name: Davide
full_name: Scarselli, Davide
id: 40315C30-F248-11E8-B48F-1D18A9856A87
last_name: Scarselli
orcid: 0000-0001-5227-4271
- first_name: Markus
full_name: Schaner, Markus
id: 316CE034-F248-11E8-B48F-1D18A9856A87
last_name: Schaner
- first_name: Björn
full_name: Hof, Björn
id: 3A374330-F248-11E8-B48F-1D18A9856A87
last_name: Hof
orcid: 0000-0003-2057-2754
citation:
ama: Kühnen J, Scarselli D, Schaner M, Hof B. Relaminarization by steady modification
of the streamwise velocity profile in a pipe. Flow Turbulence and Combustion.
2018;100(4):919-942. doi:10.1007/s10494-018-9896-4
apa: Kühnen, J., Scarselli, D., Schaner, M., & Hof, B. (2018). Relaminarization
by steady modification of the streamwise velocity profile in a pipe. Flow Turbulence
and Combustion. Springer. https://doi.org/10.1007/s10494-018-9896-4
chicago: Kühnen, Jakob, Davide Scarselli, Markus Schaner, and Björn Hof. “Relaminarization
by Steady Modification of the Streamwise Velocity Profile in a Pipe.” Flow
Turbulence and Combustion. Springer, 2018. https://doi.org/10.1007/s10494-018-9896-4.
ieee: J. Kühnen, D. Scarselli, M. Schaner, and B. Hof, “Relaminarization by steady
modification of the streamwise velocity profile in a pipe,” Flow Turbulence
and Combustion, vol. 100, no. 4. Springer, pp. 919–942, 2018.
ista: Kühnen J, Scarselli D, Schaner M, Hof B. 2018. Relaminarization by steady
modification of the streamwise velocity profile in a pipe. Flow Turbulence and
Combustion. 100(4), 919–942.
mla: Kühnen, Jakob, et al. “Relaminarization by Steady Modification of the Streamwise
Velocity Profile in a Pipe.” Flow Turbulence and Combustion, vol. 100,
no. 4, Springer, 2018, pp. 919–42, doi:10.1007/s10494-018-9896-4.
short: J. Kühnen, D. Scarselli, M. Schaner, B. Hof, Flow Turbulence and Combustion
100 (2018) 919–942.
date_created: 2018-12-11T11:46:23Z
date_published: 2018-01-01T00:00:00Z
date_updated: 2024-03-25T23:30:20Z
day: '01'
ddc:
- '530'
department:
- _id: BjHo
doi: 10.1007/s10494-018-9896-4
ec_funded: 1
external_id:
isi:
- '000433113900004'
file:
- access_level: open_access
checksum: d7c0bade150faabca150b0a9986e60ca
content_type: application/pdf
creator: dernst
date_created: 2018-12-17T15:52:37Z
date_updated: 2020-07-14T12:46:25Z
file_id: '5717'
file_name: 2018_FlowTurbulenceCombust_Kuehnen.pdf
file_size: 2210020
relation: main_file
file_date_updated: 2020-07-14T12:46:25Z
has_accepted_license: '1'
intvolume: ' 100'
isi: 1
issue: '4'
language:
- iso: eng
month: '01'
oa: 1
oa_version: Published Version
page: 919 - 942
project:
- _id: 25152F3A-B435-11E9-9278-68D0E5697425
call_identifier: FP7
grant_number: '306589'
name: Decoding the complexity of turbulence at its origin
publication: Flow Turbulence and Combustion
publication_status: published
publisher: Springer
publist_id: '7401'
quality_controlled: '1'
related_material:
record:
- id: '7258'
relation: dissertation_contains
status: public
scopus_import: '1'
status: public
title: Relaminarization by steady modification of the streamwise velocity profile
in a pipe
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: c635000d-4b10-11ee-a964-aac5a93f6ac1
volume: 100
year: '2018'
...
---
_id: '1087'
abstract:
- lang: eng
text: Using extensive direct numerical simulations, the dynamics of laminar-turbulent
fronts in pipe flow is investigated for Reynolds numbers between and 5500. We
here investigate the physical distinction between the fronts of weak and strong
slugs both by analysing the turbulent kinetic energy budget and by comparing the
downstream front motion to the advection speed of bulk turbulent structures. Our
study shows that weak downstream fronts travel slower than turbulent structures
in the bulk and correspond to decaying turbulence at the front. At the downstream
front speed becomes faster than the advection speed, marking the onset of strong
fronts. In contrast to weak fronts, turbulent eddies are generated at strong fronts
by feeding on the downstream laminar flow. Our study also suggests that temporal
fluctuations of production and dissipation at the downstream laminar-turbulent
front drive the dynamical switches between the two types of front observed up
to.
acknowledged_ssus:
- _id: ScienComp
article_processing_charge: No
author:
- first_name: Baofang
full_name: Song, Baofang
last_name: Song
- first_name: Dwight
full_name: Barkley, Dwight
last_name: Barkley
- first_name: Björn
full_name: Hof, Björn
id: 3A374330-F248-11E8-B48F-1D18A9856A87
last_name: Hof
orcid: 0000-0003-2057-2754
- first_name: Marc
full_name: Avila, Marc
last_name: Avila
citation:
ama: Song B, Barkley D, Hof B, Avila M. Speed and structure of turbulent fronts
in pipe flow. Journal of Fluid Mechanics. 2017;813:1045-1059. doi:10.1017/jfm.2017.14
apa: Song, B., Barkley, D., Hof, B., & Avila, M. (2017). Speed and structure
of turbulent fronts in pipe flow. Journal of Fluid Mechanics. Cambridge
University Press. https://doi.org/10.1017/jfm.2017.14
chicago: Song, Baofang, Dwight Barkley, Björn Hof, and Marc Avila. “Speed and Structure
of Turbulent Fronts in Pipe Flow.” Journal of Fluid Mechanics. Cambridge
University Press, 2017. https://doi.org/10.1017/jfm.2017.14.
ieee: B. Song, D. Barkley, B. Hof, and M. Avila, “Speed and structure of turbulent
fronts in pipe flow,” Journal of Fluid Mechanics, vol. 813. Cambridge University
Press, pp. 1045–1059, 2017.
ista: Song B, Barkley D, Hof B, Avila M. 2017. Speed and structure of turbulent
fronts in pipe flow. Journal of Fluid Mechanics. 813, 1045–1059.
mla: Song, Baofang, et al. “Speed and Structure of Turbulent Fronts in Pipe Flow.”
Journal of Fluid Mechanics, vol. 813, Cambridge University Press, 2017,
pp. 1045–59, doi:10.1017/jfm.2017.14.
short: B. Song, D. Barkley, B. Hof, M. Avila, Journal of Fluid Mechanics 813 (2017)
1045–1059.
date_created: 2018-12-11T11:50:04Z
date_published: 2017-02-25T00:00:00Z
date_updated: 2023-09-20T11:47:22Z
day: '25'
department:
- _id: BjHo
doi: 10.1017/jfm.2017.14
ec_funded: 1
external_id:
isi:
- '000394376400044'
intvolume: ' 813'
isi: 1
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1603.04077
month: '02'
oa: 1
oa_version: Submitted Version
page: 1045 - 1059
project:
- _id: 25152F3A-B435-11E9-9278-68D0E5697425
call_identifier: FP7
grant_number: '306589'
name: Decoding the complexity of turbulence at its origin
publication: Journal of Fluid Mechanics
publication_identifier:
issn:
- '00221120'
publication_status: published
publisher: Cambridge University Press
publist_id: '6290'
quality_controlled: '1'
scopus_import: '1'
status: public
title: Speed and structure of turbulent fronts in pipe flow
type: journal_article
user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1
volume: 813
year: '2017'
...
---
_id: '1160'
abstract:
- lang: eng
text: 'We investigate fundamental nonlinear dynamics of ferrofluidic Taylor-Couette
flow - flow confined be-tween two concentric independently rotating cylinders
- consider small aspect ratio by solving the ferro-hydrodynamical equations, carrying
out systematic bifurcation analysis. Without magnetic field, we find steady flow
patterns, previously observed with a simple fluid, such as those containing normal
one- or two vortex cells, as well as anomalous one-cell and twin-cell flow states.
However, when a symmetry-breaking transverse magnetic field is present, all flow
states exhibit stimulated, finite two-fold mode. Various bifurcations between
steady and unsteady states can occur, corresponding to the transitions between
the two-cell and one-cell states. While unsteady, axially oscillating flow states
can arise, we also detect the emergence of new unsteady flow states. In particular,
we uncover two new states: one contains only the azimuthally oscillating solution
in the configuration of the twin-cell flow state, and an-other a rotating flow
state. Topologically, these flow states are a limit cycle and a quasiperiodic
solution on a two-torus, respectively. Emergence of new flow states in addition
to observed ones with classical fluid, indicates that richer but potentially more
controllable dynamics in ferrofluidic flows, as such flow states depend on the
external magnetic field.'
article_number: '40012'
article_processing_charge: No
author:
- first_name: Sebastian
full_name: Altmeyer, Sebastian
id: 2EE67FDC-F248-11E8-B48F-1D18A9856A87
last_name: Altmeyer
orcid: 0000-0001-5964-0203
- first_name: Younghae
full_name: Do, Younghae
last_name: Do
- first_name: Ying
full_name: Lai, Ying
last_name: Lai
citation:
ama: Altmeyer S, Do Y, Lai Y. Dynamics of ferrofluidic flow in the Taylor-Couette
system with a small aspect ratio. Scientific Reports. 2017;7. doi:10.1038/srep40012
apa: Altmeyer, S., Do, Y., & Lai, Y. (2017). Dynamics of ferrofluidic flow in
the Taylor-Couette system with a small aspect ratio. Scientific Reports.
Nature Publishing Group. https://doi.org/10.1038/srep40012
chicago: Altmeyer, Sebastian, Younghae Do, and Ying Lai. “Dynamics of Ferrofluidic
Flow in the Taylor-Couette System with a Small Aspect Ratio.” Scientific Reports.
Nature Publishing Group, 2017. https://doi.org/10.1038/srep40012.
ieee: S. Altmeyer, Y. Do, and Y. Lai, “Dynamics of ferrofluidic flow in the Taylor-Couette
system with a small aspect ratio,” Scientific Reports, vol. 7. Nature Publishing
Group, 2017.
ista: Altmeyer S, Do Y, Lai Y. 2017. Dynamics of ferrofluidic flow in the Taylor-Couette
system with a small aspect ratio. Scientific Reports. 7, 40012.
mla: Altmeyer, Sebastian, et al. “Dynamics of Ferrofluidic Flow in the Taylor-Couette
System with a Small Aspect Ratio.” Scientific Reports, vol. 7, 40012, Nature
Publishing Group, 2017, doi:10.1038/srep40012.
short: S. Altmeyer, Y. Do, Y. Lai, Scientific Reports 7 (2017).
date_created: 2018-12-11T11:50:28Z
date_published: 2017-01-06T00:00:00Z
date_updated: 2023-09-20T11:28:49Z
day: '06'
ddc:
- '532'
department:
- _id: BjHo
doi: 10.1038/srep40012
external_id:
isi:
- '000391269700001'
file:
- access_level: open_access
checksum: 694aa70399444570825099c1a7ec91f2
content_type: application/pdf
creator: system
date_created: 2018-12-12T10:10:16Z
date_updated: 2020-07-14T12:44:36Z
file_id: '4802'
file_name: IST-2017-743-v1+1_srep40012.pdf
file_size: 4546835
relation: main_file
file_date_updated: 2020-07-14T12:44:36Z
has_accepted_license: '1'
intvolume: ' 7'
isi: 1
language:
- iso: eng
month: '01'
oa: 1
oa_version: Published Version
publication: Scientific Reports
publication_identifier:
issn:
- '20452322'
publication_status: published
publisher: Nature Publishing Group
publist_id: '6198'
pubrep_id: '743'
quality_controlled: '1'
scopus_import: '1'
status: public
title: Dynamics of ferrofluidic flow in the Taylor-Couette system with a small aspect
ratio
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: c635000d-4b10-11ee-a964-aac5a93f6ac1
volume: 7
year: '2017'
...
---
_id: '792'
abstract:
- lang: eng
text: The chaotic dynamics of low-dimensional systems, such as Lorenz or Rössler
flows, is guided by the infinity of periodic orbits embedded in their strange
attractors. Whether this is also the case for the infinite-dimensional dynamics
of Navier–Stokes equations has long been speculated, and is a topic of ongoing
study. Periodic and relative periodic solutions have been shown to be involved
in transitions to turbulence. Their relevance to turbulent dynamics – specifically,
whether periodic orbits play the same role in high-dimensional nonlinear systems
like the Navier–Stokes equations as they do in lower-dimensional systems – is
the focus of the present investigation. We perform here a detailed study of pipe
flow relative periodic orbits with energies and mean dissipations close to turbulent
values. We outline several approaches to reduction of the translational symmetry
of the system. We study pipe flow in a minimal computational cell at Re=2500,
and report a library of invariant solutions found with the aid of the method of
slices. Detailed study of the unstable manifolds of a sample of these solutions
is consistent with the picture that relative periodic orbits are embedded in the
chaotic saddle and that they guide the turbulent dynamics.
article_processing_charge: No
author:
- first_name: Nazmi B
full_name: Budanur, Nazmi B
id: 3EA1010E-F248-11E8-B48F-1D18A9856A87
last_name: Budanur
orcid: 0000-0003-0423-5010
- first_name: Kimberly
full_name: Short, Kimberly
last_name: Short
- first_name: Mohammad
full_name: Farazmand, Mohammad
last_name: Farazmand
- first_name: Ashley
full_name: Willis, Ashley
last_name: Willis
- first_name: Predrag
full_name: Cvitanović, Predrag
last_name: Cvitanović
citation:
ama: Budanur NB, Short K, Farazmand M, Willis A, Cvitanović P. Relative periodic
orbits form the backbone of turbulent pipe flow. Journal of Fluid Mechanics.
2017;833:274-301. doi:10.1017/jfm.2017.699
apa: Budanur, N. B., Short, K., Farazmand, M., Willis, A., & Cvitanović, P.
(2017). Relative periodic orbits form the backbone of turbulent pipe flow. Journal
of Fluid Mechanics. Cambridge University Press. https://doi.org/10.1017/jfm.2017.699
chicago: Budanur, Nazmi B, Kimberly Short, Mohammad Farazmand, Ashley Willis, and
Predrag Cvitanović. “Relative Periodic Orbits Form the Backbone of Turbulent Pipe
Flow.” Journal of Fluid Mechanics. Cambridge University Press, 2017. https://doi.org/10.1017/jfm.2017.699.
ieee: N. B. Budanur, K. Short, M. Farazmand, A. Willis, and P. Cvitanović, “Relative
periodic orbits form the backbone of turbulent pipe flow,” Journal of Fluid
Mechanics, vol. 833. Cambridge University Press, pp. 274–301, 2017.
ista: Budanur NB, Short K, Farazmand M, Willis A, Cvitanović P. 2017. Relative periodic
orbits form the backbone of turbulent pipe flow. Journal of Fluid Mechanics. 833,
274–301.
mla: Budanur, Nazmi B., et al. “Relative Periodic Orbits Form the Backbone of Turbulent
Pipe Flow.” Journal of Fluid Mechanics, vol. 833, Cambridge University
Press, 2017, pp. 274–301, doi:10.1017/jfm.2017.699.
short: N.B. Budanur, K. Short, M. Farazmand, A. Willis, P. Cvitanović, Journal of
Fluid Mechanics 833 (2017) 274–301.
date_created: 2018-12-11T11:48:32Z
date_published: 2017-12-25T00:00:00Z
date_updated: 2023-09-27T12:17:35Z
day: '25'
department:
- _id: BjHo
doi: 10.1017/jfm.2017.699
external_id:
isi:
- '000414641700001'
intvolume: ' 833'
isi: 1
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1705.03720
month: '12'
oa: 1
oa_version: Submitted Version
page: 274 - 301
project:
- _id: 25636330-B435-11E9-9278-68D0E5697425
grant_number: 11-NSF-1070
name: ROOTS Genome-wide Analysis of Root Traits
publication: Journal of Fluid Mechanics
publication_identifier:
issn:
- '00221120'
publication_status: published
publisher: Cambridge University Press
publist_id: '6862'
quality_controlled: '1'
scopus_import: '1'
status: public
title: Relative periodic orbits form the backbone of turbulent pipe flow
type: journal_article
user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1
volume: 833
year: '2017'
...
---
_id: '824'
abstract:
- lang: eng
text: 'In shear flows at transitional Reynolds numbers, localized patches of turbulence,
known as puffs, coexist with the laminar flow. Recently, Avila et al. (Phys. Rev.
Lett., vol. 110, 2013, 224502) discovered two spatially localized relative periodic
solutions for pipe flow, which appeared in a saddle-node bifurcation at low Reynolds
number. Combining slicing methods for continuous symmetry reduction with Poincaré
sections for the first time in a shear flow setting, we compute and visualize
the unstable manifold of the lower-branch solution and show that it extends towards
the neighbourhood of the upper-branch solution. Surprisingly, this connection
even persists far above the bifurcation point and appears to mediate the first
stage of the puff generation: amplification of streamwise localized fluctuations.
When the state-space trajectories on the unstable manifold reach the vicinity
of the upper branch, corresponding fluctuations expand in space and eventually
take the usual shape of a puff.'
article_number: R1
article_processing_charge: No
author:
- first_name: Nazmi B
full_name: Budanur, Nazmi B
id: 3EA1010E-F248-11E8-B48F-1D18A9856A87
last_name: Budanur
orcid: 0000-0003-0423-5010
- first_name: Björn
full_name: Hof, Björn
id: 3A374330-F248-11E8-B48F-1D18A9856A87
last_name: Hof
orcid: 0000-0003-2057-2754
citation:
ama: Budanur NB, Hof B. Heteroclinic path to spatially localized chaos in pipe flow.
Journal of Fluid Mechanics. 2017;827. doi:10.1017/jfm.2017.516
apa: Budanur, N. B., & Hof, B. (2017). Heteroclinic path to spatially localized
chaos in pipe flow. Journal of Fluid Mechanics. Cambridge University Press.
https://doi.org/10.1017/jfm.2017.516
chicago: Budanur, Nazmi B, and Björn Hof. “Heteroclinic Path to Spatially Localized
Chaos in Pipe Flow.” Journal of Fluid Mechanics. Cambridge University Press,
2017. https://doi.org/10.1017/jfm.2017.516.
ieee: N. B. Budanur and B. Hof, “Heteroclinic path to spatially localized chaos
in pipe flow,” Journal of Fluid Mechanics, vol. 827. Cambridge University
Press, 2017.
ista: Budanur NB, Hof B. 2017. Heteroclinic path to spatially localized chaos in
pipe flow. Journal of Fluid Mechanics. 827, R1.
mla: Budanur, Nazmi B., and Björn Hof. “Heteroclinic Path to Spatially Localized
Chaos in Pipe Flow.” Journal of Fluid Mechanics, vol. 827, R1, Cambridge
University Press, 2017, doi:10.1017/jfm.2017.516.
short: N.B. Budanur, B. Hof, Journal of Fluid Mechanics 827 (2017).
date_created: 2018-12-11T11:48:42Z
date_published: 2017-08-18T00:00:00Z
date_updated: 2023-09-26T16:17:43Z
day: '18'
department:
- _id: BjHo
doi: 10.1017/jfm.2017.516
external_id:
isi:
- '000408326300001'
intvolume: ' 827'
isi: 1
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1703.10484
month: '08'
oa: 1
oa_version: Submitted Version
publication: Journal of Fluid Mechanics
publication_identifier:
issn:
- '00221120'
publication_status: published
publisher: Cambridge University Press
publist_id: '6824'
quality_controlled: '1'
scopus_import: '1'
status: public
title: Heteroclinic path to spatially localized chaos in pipe flow
type: journal_article
user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1
volume: 827
year: '2017'
...
---
_id: '662'
abstract:
- lang: eng
text: 'We report a direct-numerical-simulation study of the Taylor-Couette flow
in the quasi-Keplerian regime at shear Reynolds numbers up to (105). Quasi-Keplerian
rotating flow has been investigated for decades as a simplified model system to
study the origin of turbulence in accretion disks that is not fully understood.
The flow in this study is axially periodic and thus the experimental end-wall
effects on the stability of the flow are avoided. Using optimal linear perturbations
as initial conditions, our simulations find no sustained turbulence: the strong
initial perturbations distort the velocity profile and trigger turbulence that
eventually decays.'
article_number: '044107'
author:
- first_name: Liang
full_name: Shi, Liang
last_name: Shi
- first_name: Björn
full_name: Hof, Björn
id: 3A374330-F248-11E8-B48F-1D18A9856A87
last_name: Hof
orcid: 0000-0003-2057-2754
- first_name: Markus
full_name: Rampp, Markus
last_name: Rampp
- first_name: Marc
full_name: Avila, Marc
last_name: Avila
citation:
ama: Shi L, Hof B, Rampp M, Avila M. Hydrodynamic turbulence in quasi Keplerian
rotating flows. Physics of Fluids. 2017;29(4). doi:10.1063/1.4981525
apa: Shi, L., Hof, B., Rampp, M., & Avila, M. (2017). Hydrodynamic turbulence
in quasi Keplerian rotating flows. Physics of Fluids. American Institute
of Physics. https://doi.org/10.1063/1.4981525
chicago: Shi, Liang, Björn Hof, Markus Rampp, and Marc Avila. “Hydrodynamic Turbulence
in Quasi Keplerian Rotating Flows.” Physics of Fluids. American Institute
of Physics, 2017. https://doi.org/10.1063/1.4981525.
ieee: L. Shi, B. Hof, M. Rampp, and M. Avila, “Hydrodynamic turbulence in quasi
Keplerian rotating flows,” Physics of Fluids, vol. 29, no. 4. American
Institute of Physics, 2017.
ista: Shi L, Hof B, Rampp M, Avila M. 2017. Hydrodynamic turbulence in quasi Keplerian
rotating flows. Physics of Fluids. 29(4), 044107.
mla: Shi, Liang, et al. “Hydrodynamic Turbulence in Quasi Keplerian Rotating Flows.”
Physics of Fluids, vol. 29, no. 4, 044107, American Institute of Physics,
2017, doi:10.1063/1.4981525.
short: L. Shi, B. Hof, M. Rampp, M. Avila, Physics of Fluids 29 (2017).
date_created: 2018-12-11T11:47:47Z
date_published: 2017-04-01T00:00:00Z
date_updated: 2021-01-12T08:08:15Z
day: '01'
department:
- _id: BjHo
doi: 10.1063/1.4981525
intvolume: ' 29'
issue: '4'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1703.01714
month: '04'
oa: 1
oa_version: Submitted Version
project:
- _id: 2511D90C-B435-11E9-9278-68D0E5697425
grant_number: SFB 963 TP A8
name: Astrophysical instability of currents and turbulences
publication: Physics of Fluids
publication_identifier:
issn:
- '10706631'
publication_status: published
publisher: American Institute of Physics
publist_id: '7072'
quality_controlled: '1'
scopus_import: 1
status: public
title: Hydrodynamic turbulence in quasi Keplerian rotating flows
type: journal_article
user_id: 4435EBFC-F248-11E8-B48F-1D18A9856A87
volume: 29
year: '2017'
...
---
_id: '673'
abstract:
- lang: eng
text: We present a numerical study of wavy supercritical cylindrical Couette flow
between counter-rotating cylinders in which the wavy pattern propagates either
prograde with the inner cylinder or retrograde opposite the rotation of the inner
cylinder. The wave propagation reversals from prograde to retrograde and vice
versa occur at distinct values of the inner cylinder Reynolds number when the
associated frequency of the wavy instability vanishes. The reversal occurs for
both twofold and threefold symmetric wavy vortices. Moreover, the wave propagation
reversal only occurs for sufficiently strong counter-rotation. The flow pattern
reversal appears to be intrinsic in the system as either periodic boundary conditions
or fixed end wall boundary conditions for different system sizes always result
in the wave propagation reversal. We present a detailed bifurcation sequence and
parameter space diagram with respect to retrograde behavior of wavy flows. The
retrograde propagation of the instability occurs when the inner Reynolds number
is about two times the outer Reynolds number. The mechanism for the retrograde
propagation is associated with the inviscidly unstable region near the inner cylinder
and the direction of the global average azimuthal velocity. Flow dynamics, spatio-temporal
behavior, global mean angular velocity, and torque of the flow with the wavy pattern
are explored.
article_number: '053103'
article_processing_charge: No
author:
- first_name: Sebastian
full_name: Altmeyer, Sebastian
id: 2EE67FDC-F248-11E8-B48F-1D18A9856A87
last_name: Altmeyer
orcid: 0000-0001-5964-0203
- first_name: Richard
full_name: Lueptow, Richard
last_name: Lueptow
citation:
ama: Altmeyer S, Lueptow R. Wave propagation reversal for wavy vortices in wide
gap counter rotating cylindrical Couette flow. Physical Review E. 2017;95(5).
doi:10.1103/PhysRevE.95.053103
apa: Altmeyer, S., & Lueptow, R. (2017). Wave propagation reversal for wavy
vortices in wide gap counter rotating cylindrical Couette flow. Physical Review
E. American Physical Society. https://doi.org/10.1103/PhysRevE.95.053103
chicago: Altmeyer, Sebastian, and Richard Lueptow. “Wave Propagation Reversal for
Wavy Vortices in Wide Gap Counter Rotating Cylindrical Couette Flow.” Physical
Review E. American Physical Society, 2017. https://doi.org/10.1103/PhysRevE.95.053103.
ieee: S. Altmeyer and R. Lueptow, “Wave propagation reversal for wavy vortices in
wide gap counter rotating cylindrical Couette flow,” Physical Review E,
vol. 95, no. 5. American Physical Society, 2017.
ista: Altmeyer S, Lueptow R. 2017. Wave propagation reversal for wavy vortices in
wide gap counter rotating cylindrical Couette flow. Physical Review E. 95(5),
053103.
mla: Altmeyer, Sebastian, and Richard Lueptow. “Wave Propagation Reversal for Wavy
Vortices in Wide Gap Counter Rotating Cylindrical Couette Flow.” Physical Review
E, vol. 95, no. 5, 053103, American Physical Society, 2017, doi:10.1103/PhysRevE.95.053103.
short: S. Altmeyer, R. Lueptow, Physical Review E 95 (2017).
date_created: 2018-12-11T11:47:50Z
date_published: 2017-05-10T00:00:00Z
date_updated: 2023-10-10T13:30:03Z
day: '10'
department:
- _id: BjHo
doi: 10.1103/PhysRevE.95.053103
intvolume: ' 95'
issue: '5'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/pdf/physics/0505164.pdf
month: '05'
oa: 1
oa_version: Submitted Version
publication: Physical Review E
publication_identifier:
issn:
- 2470-0045
publication_status: published
publisher: American Physical Society
publist_id: '7049'
scopus_import: '1'
status: public
title: Wave propagation reversal for wavy vortices in wide gap counter rotating cylindrical
Couette flow
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 95
year: '2017'
...
---
_id: '745'
abstract:
- lang: eng
text: 'Fluid flows in nature and applications are frequently subject to periodic
velocity modulations. Surprisingly, even for the generic case of flow through
a straight pipe, there is little consensus regarding the influence of pulsation
on the transition threshold to turbulence: while most studies predict a monotonically
increasing threshold with pulsation frequency (i.e. Womersley number, ), others
observe a decreasing threshold for identical parameters and only observe an increasing
threshold at low . In the present study we apply recent advances in the understanding
of transition in steady shear flows to pulsating pipe flow. For moderate pulsation
amplitudes we find that the first instability encountered is subcritical (i.e.
requiring finite amplitude disturbances) and gives rise to localized patches of
turbulence (''puffs'') analogous to steady pipe flow. By monitoring the impact
of pulsation on the lifetime of turbulence we map the onset of turbulence in parameter
space. Transition in pulsatile flow can be separated into three regimes. At small
Womersley numbers the dynamics is dominated by the decay turbulence suffers during
the slower part of the cycle and hence transition is delayed significantly. As
shown in this regime thresholds closely agree with estimates based on a quasi-steady
flow assumption only taking puff decay rates into account. The transition point
predicted in the zero limit equals to the critical point for steady pipe flow
offset by the oscillation Reynolds number (i.e. the dimensionless oscillation
amplitude). In the high frequency limit on the other hand, puff lifetimes are
identical to those in steady pipe flow and hence the transition threshold appears
to be unaffected by flow pulsation. In the intermediate frequency regime the transition
threshold sharply drops (with increasing ) from the decay dominated (quasi-steady)
threshold to the steady pipe flow level.'
article_processing_charge: No
author:
- first_name: Duo
full_name: Xu, Duo
id: 3454D55E-F248-11E8-B48F-1D18A9856A87
last_name: Xu
- first_name: Sascha
full_name: Warnecke, Sascha
last_name: Warnecke
- first_name: Baofang
full_name: Song, Baofang
last_name: Song
- first_name: Xingyu
full_name: Ma, Xingyu
id: 34BADBA6-F248-11E8-B48F-1D18A9856A87
last_name: Ma
orcid: 0000-0002-0179-9737
- first_name: Björn
full_name: Hof, Björn
id: 3A374330-F248-11E8-B48F-1D18A9856A87
last_name: Hof
orcid: 0000-0003-2057-2754
citation:
ama: Xu D, Warnecke S, Song B, Ma X, Hof B. Transition to turbulence in pulsating
pipe flow. Journal of Fluid Mechanics. 2017;831:418-432. doi:10.1017/jfm.2017.620
apa: Xu, D., Warnecke, S., Song, B., Ma, X., & Hof, B. (2017). Transition to
turbulence in pulsating pipe flow. Journal of Fluid Mechanics. Cambridge
University Press. https://doi.org/10.1017/jfm.2017.620
chicago: Xu, Duo, Sascha Warnecke, Baofang Song, Xingyu Ma, and Björn Hof. “Transition
to Turbulence in Pulsating Pipe Flow.” Journal of Fluid Mechanics. Cambridge
University Press, 2017. https://doi.org/10.1017/jfm.2017.620.
ieee: D. Xu, S. Warnecke, B. Song, X. Ma, and B. Hof, “Transition to turbulence
in pulsating pipe flow,” Journal of Fluid Mechanics, vol. 831. Cambridge
University Press, pp. 418–432, 2017.
ista: Xu D, Warnecke S, Song B, Ma X, Hof B. 2017. Transition to turbulence in pulsating
pipe flow. Journal of Fluid Mechanics. 831, 418–432.
mla: Xu, Duo, et al. “Transition to Turbulence in Pulsating Pipe Flow.” Journal
of Fluid Mechanics, vol. 831, Cambridge University Press, 2017, pp. 418–32,
doi:10.1017/jfm.2017.620.
short: D. Xu, S. Warnecke, B. Song, X. Ma, B. Hof, Journal of Fluid Mechanics 831
(2017) 418–432.
date_created: 2018-12-11T11:48:17Z
date_published: 2017-11-25T00:00:00Z
date_updated: 2023-09-27T12:28:12Z
day: '25'
department:
- _id: BjHo
doi: 10.1017/jfm.2017.620
ec_funded: 1
external_id:
isi:
- '000412934800005'
intvolume: ' 831'
isi: 1
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1709.03738
month: '11'
oa: 1
oa_version: Submitted Version
page: 418 - 432
project:
- _id: 25152F3A-B435-11E9-9278-68D0E5697425
call_identifier: FP7
grant_number: '306589'
name: Decoding the complexity of turbulence at its origin
publication: Journal of Fluid Mechanics
publication_identifier:
issn:
- '00221120'
publication_status: published
publisher: Cambridge University Press
publist_id: '6922'
quality_controlled: '1'
scopus_import: '1'
status: public
title: Transition to turbulence in pulsating pipe flow
type: journal_article
user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1
volume: 831
year: '2017'
...
---
_id: '463'
abstract:
- lang: eng
text: We investigate transient behaviors induced by magnetic fields on the dynamics
of the flow of a ferrofluid in the gap between two concentric, independently rotating
cylinders. Without applying any magnetic fields, we uncover emergence of flow
states constituted by a combination of a localized spiral state (SPIl) in the
top and bottom of the annulus and different multi-cell flow states (SPI2v, SPI3v)
with toroidally closed vortices in the interior of the bulk (SPIl+2v = SPIl +
SPI2v and SPIl+3v = SPIl + SPI3v). However, when a magnetic field is presented,
we observe the transient behaviors between multi-cell states passing through two
critical thresholds in a strength of an axial (transverse) magnetic field. Before
the first critical threshold of a magnetic field strength, multi-stable states
with different number of cells could be observed. After the first critical threshold,
we find the transient behavior between the three- and two-cell flow states. For
more strength of magnetic field or after the second critical threshold, we discover
that multi-cell states are disappeared and a localized spiral state remains to
be stimulated. The studied transient behavior could be understood by the investigation
of various quantities including a modal kinetic energy, a mode amplitude of the
radial velocity, wavenumber, angular momentum, and torque. In addition, the emergence
of new flow states and the transient behavior between their states in ferrofluidic
flows indicate that richer and potentially controllable dynamics through magnetic
fields could be possible in ferrofluic flow.
article_number: '113112'
article_processing_charge: No
article_type: original
author:
- first_name: Sebastian
full_name: Altmeyer, Sebastian
id: 2EE67FDC-F248-11E8-B48F-1D18A9856A87
last_name: Altmeyer
orcid: 0000-0001-5964-0203
- first_name: Younghae
full_name: Do, Younghae
last_name: Do
- first_name: Soorok
full_name: Ryu, Soorok
last_name: Ryu
citation:
ama: Altmeyer S, Do Y, Ryu S. Transient behavior between multi-cell flow states
in ferrofluidic Taylor-Couette flow. Chaos. 2017;27(11). doi:10.1063/1.5002771
apa: Altmeyer, S., Do, Y., & Ryu, S. (2017). Transient behavior between multi-cell
flow states in ferrofluidic Taylor-Couette flow. Chaos. AIP Publishing.
https://doi.org/10.1063/1.5002771
chicago: Altmeyer, Sebastian, Younghae Do, and Soorok Ryu. “Transient Behavior between
Multi-Cell Flow States in Ferrofluidic Taylor-Couette Flow.” Chaos. AIP
Publishing, 2017. https://doi.org/10.1063/1.5002771.
ieee: S. Altmeyer, Y. Do, and S. Ryu, “Transient behavior between multi-cell flow
states in ferrofluidic Taylor-Couette flow,” Chaos, vol. 27, no. 11. AIP
Publishing, 2017.
ista: Altmeyer S, Do Y, Ryu S. 2017. Transient behavior between multi-cell flow
states in ferrofluidic Taylor-Couette flow. Chaos. 27(11), 113112.
mla: Altmeyer, Sebastian, et al. “Transient Behavior between Multi-Cell Flow States
in Ferrofluidic Taylor-Couette Flow.” Chaos, vol. 27, no. 11, 113112, AIP
Publishing, 2017, doi:10.1063/1.5002771.
short: S. Altmeyer, Y. Do, S. Ryu, Chaos 27 (2017).
date_created: 2018-12-11T11:46:37Z
date_published: 2017-11-01T00:00:00Z
date_updated: 2024-02-28T13:02:12Z
day: '01'
ddc:
- '530'
department:
- _id: BjHo
doi: 10.1063/1.5002771
file:
- access_level: open_access
checksum: 0731f9d416760c1062db258ca51f8bdc
content_type: application/pdf
creator: dernst
date_created: 2019-10-24T15:14:30Z
date_updated: 2020-07-14T12:46:32Z
file_id: '6970'
file_name: 2017_Chaos_Altmeyer.pdf
file_size: 7714020
relation: main_file
file_date_updated: 2020-07-14T12:46:32Z
has_accepted_license: '1'
intvolume: ' 27'
issue: '11'
language:
- iso: eng
month: '11'
oa: 1
oa_version: Published Version
publication: Chaos
publication_identifier:
issn:
- '10541500'
publication_status: published
publisher: AIP Publishing
publist_id: '7358'
quality_controlled: '1'
scopus_import: '1'
status: public
title: Transient behavior between multi-cell flow states in ferrofluidic Taylor-Couette
flow
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 27
year: '2017'
...
---
_id: '513'
abstract:
- lang: eng
text: 'We present an experimental setup that creates a shear flow with zero mean
advection velocity achieved by counterbalancing the nonzero streamwise pressure
gradient by moving boundaries, which generates plane Couette-Poiseuille flow.
We obtain experimental results in the transitional regime for this flow. Using
flow visualization, we characterize the subcritical transition to turbulence in
Couette-Poiseuille flow and show the existence of turbulent spots generated by
a permanent perturbation. Due to the zero mean advection velocity of the base
profile, these turbulent structures are nearly stationary. We distinguish two
regions of the turbulent spot: the active turbulent core, which is characterized
by waviness of the streaks similar to traveling waves, and the surrounding region,
which includes in addition the weak undisturbed streaks and oblique waves at the
laminar-turbulent interface. We also study the dependence of the size of these
two regions on Reynolds number. Finally, we show that the traveling waves move
in the downstream (Poiseuille) direction.'
article_number: '043904'
author:
- first_name: Lukasz
full_name: Klotz, Lukasz
id: 2C9AF1C2-F248-11E8-B48F-1D18A9856A87
last_name: Klotz
orcid: 0000-0003-1740-7635
- first_name: Grégoire M
full_name: Lemoult, Grégoire M
id: 4787FE80-F248-11E8-B48F-1D18A9856A87
last_name: Lemoult
- first_name: Idalia
full_name: Frontczak, Idalia
last_name: Frontczak
- first_name: Laurette
full_name: Tuckerman, Laurette
last_name: Tuckerman
- first_name: José
full_name: Wesfreid, José
last_name: Wesfreid
citation:
ama: 'Klotz L, Lemoult GM, Frontczak I, Tuckerman L, Wesfreid J. Couette-Poiseuille
flow experiment with zero mean advection velocity: Subcritical transition to turbulence.
Physical Review Fluids. 2017;2(4). doi:10.1103/PhysRevFluids.2.043904'
apa: 'Klotz, L., Lemoult, G. M., Frontczak, I., Tuckerman, L., & Wesfreid, J.
(2017). Couette-Poiseuille flow experiment with zero mean advection velocity:
Subcritical transition to turbulence. Physical Review Fluids. American
Physical Society. https://doi.org/10.1103/PhysRevFluids.2.043904'
chicago: 'Klotz, Lukasz, Grégoire M Lemoult, Idalia Frontczak, Laurette Tuckerman,
and José Wesfreid. “Couette-Poiseuille Flow Experiment with Zero Mean Advection
Velocity: Subcritical Transition to Turbulence.” Physical Review Fluids.
American Physical Society, 2017. https://doi.org/10.1103/PhysRevFluids.2.043904.'
ieee: 'L. Klotz, G. M. Lemoult, I. Frontczak, L. Tuckerman, and J. Wesfreid, “Couette-Poiseuille
flow experiment with zero mean advection velocity: Subcritical transition to turbulence,”
Physical Review Fluids, vol. 2, no. 4. American Physical Society, 2017.'
ista: 'Klotz L, Lemoult GM, Frontczak I, Tuckerman L, Wesfreid J. 2017. Couette-Poiseuille
flow experiment with zero mean advection velocity: Subcritical transition to turbulence.
Physical Review Fluids. 2(4), 043904.'
mla: 'Klotz, Lukasz, et al. “Couette-Poiseuille Flow Experiment with Zero Mean Advection
Velocity: Subcritical Transition to Turbulence.” Physical Review Fluids,
vol. 2, no. 4, 043904, American Physical Society, 2017, doi:10.1103/PhysRevFluids.2.043904.'
short: L. Klotz, G.M. Lemoult, I. Frontczak, L. Tuckerman, J. Wesfreid, Physical
Review Fluids 2 (2017).
date_created: 2018-12-11T11:46:54Z
date_published: 2017-04-01T00:00:00Z
date_updated: 2021-01-12T08:01:16Z
day: '01'
department:
- _id: BjHo
doi: 10.1103/PhysRevFluids.2.043904
intvolume: ' 2'
issue: '4'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1704.02619
month: '04'
oa: 1
oa_version: Preprint
publication: Physical Review Fluids
publication_status: published
publisher: American Physical Society
publist_id: '7306'
quality_controlled: '1'
scopus_import: 1
status: public
title: 'Couette-Poiseuille flow experiment with zero mean advection velocity: Subcritical
transition to turbulence'
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 2
year: '2017'
...
---
_id: '651'
abstract:
- lang: eng
text: "Superhydrophobic surfaces reduce the frictional drag between water and solid
materials, but this effect is often temporary. The realization of sustained drag
reduction has applications for water vehicles and pipeline flows.\r\n\r\n"
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. Fluid dynamics: Water flows out of touch. Nature. 2017;541(7636):161-162.
doi:10.1038/541161a'
apa: 'Hof, B. (2017). Fluid dynamics: Water flows out of touch. Nature. Nature
Publishing Group. https://doi.org/10.1038/541161a'
chicago: 'Hof, Björn. “Fluid Dynamics: Water Flows out of Touch.” Nature.
Nature Publishing Group, 2017. https://doi.org/10.1038/541161a.'
ieee: 'B. Hof, “Fluid dynamics: Water flows out of touch,” Nature, vol. 541,
no. 7636. Nature Publishing Group, pp. 161–162, 2017.'
ista: 'Hof B. 2017. Fluid dynamics: Water flows out of touch. Nature. 541(7636),
161–162.'
mla: 'Hof, Björn. “Fluid Dynamics: Water Flows out of Touch.” Nature, vol.
541, no. 7636, Nature Publishing Group, 2017, pp. 161–62, doi:10.1038/541161a.'
short: B. Hof, Nature 541 (2017) 161–162.
date_created: 2018-12-11T11:47:43Z
date_published: 2017-01-11T00:00:00Z
date_updated: 2021-01-12T08:07:49Z
day: '11'
department:
- _id: BjHo
doi: 10.1038/541161a
intvolume: ' 541'
issue: '7636'
language:
- iso: eng
month: '01'
oa_version: None
page: 161 - 162
publication: Nature
publication_identifier:
issn:
- '00280836'
publication_status: published
publisher: Nature Publishing Group
publist_id: '7116'
quality_controlled: '1'
scopus_import: 1
status: public
title: 'Fluid dynamics: Water flows out of touch'
type: journal_article
user_id: 4435EBFC-F248-11E8-B48F-1D18A9856A87
volume: 541
year: '2017'
...
---
_id: '661'
abstract:
- lang: eng
text: During embryonic development, mechanical forces are essential for cellular
rearrangements driving tissue morphogenesis. Here, we show that in the early zebrafish
embryo, friction forces are generated at the interface between anterior axial
mesoderm (prechordal plate, ppl) progenitors migrating towards the animal pole
and neurectoderm progenitors moving in the opposite direction towards the vegetal
pole of the embryo. These friction forces lead to global rearrangement of cells
within the neurectoderm and determine the position of the neural anlage. Using
a combination of experiments and simulations, we show that this process depends
on hydrodynamic coupling between neurectoderm and ppl as a result of E-cadherin-mediated
adhesion between those tissues. Our data thus establish the emergence of friction
forces at the interface between moving tissues as a critical force-generating
process shaping the embryo.
acknowledged_ssus:
- _id: SSU
author:
- first_name: Michael
full_name: Smutny, Michael
id: 3FE6E4E8-F248-11E8-B48F-1D18A9856A87
last_name: Smutny
orcid: 0000-0002-5920-9090
- first_name: Zsuzsa
full_name: Ákos, Zsuzsa
last_name: Ákos
- first_name: Silvia
full_name: Grigolon, Silvia
last_name: Grigolon
- first_name: Shayan
full_name: Shamipour, Shayan
id: 40B34FE2-F248-11E8-B48F-1D18A9856A87
last_name: Shamipour
- first_name: Verena
full_name: Ruprecht, Verena
last_name: Ruprecht
- first_name: Daniel
full_name: Capek, Daniel
id: 31C42484-F248-11E8-B48F-1D18A9856A87
last_name: Capek
orcid: 0000-0001-5199-9940
- first_name: Martin
full_name: Behrndt, Martin
id: 3ECECA3A-F248-11E8-B48F-1D18A9856A87
last_name: Behrndt
- first_name: Ekaterina
full_name: Papusheva, Ekaterina
id: 41DB591E-F248-11E8-B48F-1D18A9856A87
last_name: Papusheva
- first_name: Masazumi
full_name: Tada, Masazumi
last_name: Tada
- first_name: Björn
full_name: Hof, Björn
id: 3A374330-F248-11E8-B48F-1D18A9856A87
last_name: Hof
orcid: 0000-0003-2057-2754
- first_name: Tamás
full_name: Vicsek, Tamás
last_name: Vicsek
- first_name: Guillaume
full_name: Salbreux, Guillaume
last_name: Salbreux
- first_name: Carl-Philipp J
full_name: Heisenberg, Carl-Philipp J
id: 39427864-F248-11E8-B48F-1D18A9856A87
last_name: Heisenberg
orcid: 0000-0002-0912-4566
citation:
ama: Smutny M, Ákos Z, Grigolon S, et al. Friction forces position the neural anlage.
Nature Cell Biology. 2017;19:306-317. doi:10.1038/ncb3492
apa: Smutny, M., Ákos, Z., Grigolon, S., Shamipour, S., Ruprecht, V., Capek, D.,
… Heisenberg, C.-P. J. (2017). Friction forces position the neural anlage. Nature
Cell Biology. Nature Publishing Group. https://doi.org/10.1038/ncb3492
chicago: Smutny, Michael, Zsuzsa Ákos, Silvia Grigolon, Shayan Shamipour, Verena
Ruprecht, Daniel Capek, Martin Behrndt, et al. “Friction Forces Position the Neural
Anlage.” Nature Cell Biology. Nature Publishing Group, 2017. https://doi.org/10.1038/ncb3492.
ieee: M. Smutny et al., “Friction forces position the neural anlage,” Nature
Cell Biology, vol. 19. Nature Publishing Group, pp. 306–317, 2017.
ista: Smutny M, Ákos Z, Grigolon S, Shamipour S, Ruprecht V, Capek D, Behrndt M,
Papusheva E, Tada M, Hof B, Vicsek T, Salbreux G, Heisenberg C-PJ. 2017. Friction
forces position the neural anlage. Nature Cell Biology. 19, 306–317.
mla: Smutny, Michael, et al. “Friction Forces Position the Neural Anlage.” Nature
Cell Biology, vol. 19, Nature Publishing Group, 2017, pp. 306–17, doi:10.1038/ncb3492.
short: M. Smutny, Z. Ákos, S. Grigolon, S. Shamipour, V. Ruprecht, D. Capek, M.
Behrndt, E. Papusheva, M. Tada, B. Hof, T. Vicsek, G. Salbreux, C.-P.J. Heisenberg,
Nature Cell Biology 19 (2017) 306–317.
date_created: 2018-12-11T11:47:46Z
date_published: 2017-03-27T00:00:00Z
date_updated: 2024-03-25T23:30:21Z
day: '27'
department:
- _id: CaHe
- _id: BjHo
- _id: Bio
doi: 10.1038/ncb3492
ec_funded: 1
external_id:
pmid:
- '28346437'
intvolume: ' 19'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://europepmc.org/articles/pmc5635970
month: '03'
oa: 1
oa_version: Submitted Version
page: 306 - 317
pmid: 1
project:
- _id: 25152F3A-B435-11E9-9278-68D0E5697425
call_identifier: FP7
grant_number: '306589'
name: Decoding the complexity of turbulence at its origin
- _id: 252ABD0A-B435-11E9-9278-68D0E5697425
call_identifier: FWF
grant_number: I 930-B20
name: Control of Epithelial Cell Layer Spreading in Zebrafish
publication: Nature Cell Biology
publication_identifier:
issn:
- '14657392'
publication_status: published
publisher: Nature Publishing Group
publist_id: '7074'
quality_controlled: '1'
related_material:
record:
- id: '50'
relation: dissertation_contains
status: public
- id: '8350'
relation: dissertation_contains
status: public
scopus_import: 1
status: public
title: Friction forces position the neural anlage
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 19
year: '2017'
...
---
_id: '1021'
abstract:
- lang: eng
text: Most flows in nature and engineering are turbulent because of their large
velocities and spatial scales. Laboratory experiments on rotating quasi-Keplerian
flows, for which the angular velocity decreases radially but the angular momentum
increases, are however laminar at Reynolds numbers exceeding one million. This
is in apparent contradiction to direct numerical simulations showing that in these
experiments turbulence transition is triggered by the axial boundaries. We here
show numerically that as the Reynolds number increases, turbulence becomes progressively
confined to the boundary layers and the flow in the bulk fully relaminarizes.
Our findings support that turbulence is unlikely to occur in isothermal constant-density
quasi-Keplerian flows.
article_processing_charge: No
author:
- first_name: Jose M
full_name: Lopez Alonso, Jose M
id: 40770848-F248-11E8-B48F-1D18A9856A87
last_name: Lopez Alonso
orcid: 0000-0002-0384-2022
- first_name: Marc
full_name: Avila, Marc
last_name: Avila
citation:
ama: Lopez Alonso JM, Avila M. Boundary layer turbulence in experiments on quasi
Keplerian flows. Journal of Fluid Mechanics. 2017;817:21-34. doi:10.1017/jfm.2017.109
apa: Lopez Alonso, J. M., & Avila, M. (2017). Boundary layer turbulence in experiments
on quasi Keplerian flows. Journal of Fluid Mechanics. Cambridge University
Press. https://doi.org/10.1017/jfm.2017.109
chicago: Lopez Alonso, Jose M, and Marc Avila. “Boundary Layer Turbulence in Experiments
on Quasi Keplerian Flows.” Journal of Fluid Mechanics. Cambridge University
Press, 2017. https://doi.org/10.1017/jfm.2017.109.
ieee: J. M. Lopez Alonso and M. Avila, “Boundary layer turbulence in experiments
on quasi Keplerian flows,” Journal of Fluid Mechanics, vol. 817. Cambridge
University Press, pp. 21–34, 2017.
ista: Lopez Alonso JM, Avila M. 2017. Boundary layer turbulence in experiments on
quasi Keplerian flows. Journal of Fluid Mechanics. 817, 21–34.
mla: Lopez Alonso, Jose M., and Marc Avila. “Boundary Layer Turbulence in Experiments
on Quasi Keplerian Flows.” Journal of Fluid Mechanics, vol. 817, Cambridge
University Press, 2017, pp. 21–34, doi:10.1017/jfm.2017.109.
short: J.M. Lopez Alonso, M. Avila, Journal of Fluid Mechanics 817 (2017) 21–34.
date_created: 2018-12-11T11:49:44Z
date_published: 2017-04-25T00:00:00Z
date_updated: 2023-09-22T09:39:46Z
day: '25'
department:
- _id: BjHo
doi: 10.1017/jfm.2017.109
external_id:
isi:
- '000398179100006'
intvolume: ' 817'
isi: 1
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1608.05527
month: '04'
oa: 1
oa_version: Submitted Version
page: 21 - 34
project:
- _id: 255008E4-B435-11E9-9278-68D0E5697425
grant_number: RGP0065/2012
name: Information processing and computation in fish groups
publication: Journal of Fluid Mechanics
publication_identifier:
issn:
- '00221120'
publication_status: published
publisher: Cambridge University Press
publist_id: '6371'
quality_controlled: '1'
scopus_import: '1'
status: public
title: Boundary layer turbulence in experiments on quasi Keplerian flows
type: journal_article
user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1
volume: 817
year: '2017'
...
---
_id: '1211'
abstract:
- lang: eng
text: Systems such as fluid flows in channels and pipes or the complex Ginzburg–Landau
system, defined over periodic domains, exhibit both continuous symmetries, translational
and rotational, as well as discrete symmetries under spatial reflections or complex
conjugation. The simplest, and very common symmetry of this type is the equivariance
of the defining equations under the orthogonal group O(2). We formulate a novel
symmetry reduction scheme for such systems by combining the method of slices with
invariant polynomial methods, and show how it works by applying it to the Kuramoto–Sivashinsky
system in one spatial dimension. As an example, we track a relative periodic orbit
through a sequence of bifurcations to the onset of chaos. Within the symmetry-reduced
state space we are able to compute and visualize the unstable manifolds of relative
periodic orbits, their torus bifurcations, a transition to chaos via torus breakdown,
and heteroclinic connections between various relative periodic orbits. It would
be very hard to carry through such analysis in the full state space, without a
symmetry reduction such as the one we present here.
acknowledgement: 'This work was supported by the family of late G. Robinson, Jr. and
NSF Grant DMS-1211827. '
author:
- first_name: Nazmi B
full_name: Budanur, Nazmi B
id: 3EA1010E-F248-11E8-B48F-1D18A9856A87
last_name: Budanur
orcid: 0000-0003-0423-5010
- first_name: Predrag
full_name: Cvitanović, Predrag
last_name: Cvitanović
citation:
ama: Budanur NB, Cvitanović P. Unstable manifolds of relative periodic orbits in
the symmetry reduced state space of the Kuramoto–Sivashinsky system. Journal
of Statistical Physics. 2017;167(3-4):636-655. doi:10.1007/s10955-016-1672-z
apa: Budanur, N. B., & Cvitanović, P. (2017). Unstable manifolds of relative
periodic orbits in the symmetry reduced state space of the Kuramoto–Sivashinsky
system. Journal of Statistical Physics. Springer. https://doi.org/10.1007/s10955-016-1672-z
chicago: Budanur, Nazmi B, and Predrag Cvitanović. “Unstable Manifolds of Relative
Periodic Orbits in the Symmetry Reduced State Space of the Kuramoto–Sivashinsky
System.” Journal of Statistical Physics. Springer, 2017. https://doi.org/10.1007/s10955-016-1672-z.
ieee: N. B. Budanur and P. Cvitanović, “Unstable manifolds of relative periodic
orbits in the symmetry reduced state space of the Kuramoto–Sivashinsky system,”
Journal of Statistical Physics, vol. 167, no. 3–4. Springer, pp. 636–655,
2017.
ista: Budanur NB, Cvitanović P. 2017. Unstable manifolds of relative periodic orbits
in the symmetry reduced state space of the Kuramoto–Sivashinsky system. Journal
of Statistical Physics. 167(3–4), 636–655.
mla: Budanur, Nazmi B., and Predrag Cvitanović. “Unstable Manifolds of Relative
Periodic Orbits in the Symmetry Reduced State Space of the Kuramoto–Sivashinsky
System.” Journal of Statistical Physics, vol. 167, no. 3–4, Springer, 2017,
pp. 636–55, doi:10.1007/s10955-016-1672-z.
short: N.B. Budanur, P. Cvitanović, Journal of Statistical Physics 167 (2017) 636–655.
date_created: 2018-12-11T11:50:44Z
date_published: 2017-05-01T00:00:00Z
date_updated: 2021-01-12T06:49:07Z
day: '01'
ddc:
- '530'
department:
- _id: BjHo
doi: 10.1007/s10955-016-1672-z
file:
- access_level: open_access
checksum: 3e971d09eb167761aa0888ed415b0056
content_type: application/pdf
creator: system
date_created: 2018-12-12T10:18:01Z
date_updated: 2020-07-14T12:44:39Z
file_id: '5319'
file_name: IST-2017-782-v1+1_BudCvi15.pdf
file_size: 2820207
relation: main_file
file_date_updated: 2020-07-14T12:44:39Z
has_accepted_license: '1'
intvolume: ' 167'
issue: 3-4
language:
- iso: eng
month: '05'
oa: 1
oa_version: Submitted Version
page: 636-655
publication: Journal of Statistical Physics
publication_status: published
publisher: Springer
publist_id: '6136'
pubrep_id: '782'
quality_controlled: '1'
scopus_import: 1
status: public
title: Unstable manifolds of relative periodic orbits in the symmetry reduced state
space of the Kuramoto–Sivashinsky system
type: journal_article
user_id: 3E5EF7F0-F248-11E8-B48F-1D18A9856A87
volume: 167
year: '2017'
...
---
_id: '1494'
abstract:
- lang: eng
text: Turbulence is one of the most frequently encountered non-equilibrium phenomena
in nature, yet characterizing the transition that gives rise to turbulence in
basic shear flows has remained an elusive task. Although, in recent studies, critical
points marking the onset of sustained turbulence have been determined for several
such flows, the physical nature of the transition could not be fully explained.
In extensive experimental and computational studies we show for the example of
Couette flow that the onset of turbulence is a second-order phase transition and
falls into the directed percolation universality class. Consequently, the complex
laminar–turbulent patterns distinctive for the onset of turbulence in shear flows
result from short-range interactions of turbulent domains and are characterized
by universal critical exponents. More generally, our study demonstrates that even
high-dimensional systems far from equilibrium such as turbulence exhibit universality
at onset and that here the collective dynamics obeys simple rules.
acknowledgement: We thank P. Maier for providing valuable ideas and supporting us
in the technical aspects. Discussions with D. Barkley, Y. Duguet, B. Eckhart, N.
Goldenfeld, P. Manneville and K. Takeuchi are gratefully acknowledged. We acknowledge
the Deutsche Forschungsgemeinschaft (Project No. FOR 1182), and the European Research
Council under the European Union’s Seventh Framework Programme (FP/2007-2013)/ERC
Grant Agreement 306589 for financial support. L.S. and B.H. acknowledge research
funding by Deutsche Forschungsgemeinschaft (DFG) under Grant No. SFB 963/1 (project
A8). Numerical simulations were performed thanks to the CPU time allocations of
JUROPA in Juelich Supercomputing Center (project HGU17) and of the Max Planck Computing
and Data Facility (Garching, Germany). Excellent technical support from M. Rampp
on the hybrid code nsCouette is appreciated.
author:
- first_name: Grégoire M
full_name: Lemoult, Grégoire M
id: 4787FE80-F248-11E8-B48F-1D18A9856A87
last_name: Lemoult
- first_name: Liang
full_name: Shi, Liang
id: 374A3F1A-F248-11E8-B48F-1D18A9856A87
last_name: Shi
- first_name: Kerstin
full_name: Avila, Kerstin
last_name: Avila
- first_name: Shreyas V
full_name: Jalikop, Shreyas V
id: 44A1D772-F248-11E8-B48F-1D18A9856A87
last_name: Jalikop
- first_name: Marc
full_name: Avila, Marc
last_name: Avila
- 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, Shi L, Avila K, Jalikop SV, Avila M, Hof B. Directed percolation
phase transition to sustained turbulence in Couette flow. Nature Physics.
2016;12(3):254-258. doi:10.1038/nphys3675
apa: Lemoult, G. M., Shi, L., Avila, K., Jalikop, S. V., Avila, M., & Hof, B.
(2016). Directed percolation phase transition to sustained turbulence in Couette
flow. Nature Physics. Nature Publishing Group. https://doi.org/10.1038/nphys3675
chicago: Lemoult, Grégoire M, Liang Shi, Kerstin Avila, Shreyas V Jalikop, Marc
Avila, and Björn Hof. “Directed Percolation Phase Transition to Sustained Turbulence
in Couette Flow.” Nature Physics. Nature Publishing Group, 2016. https://doi.org/10.1038/nphys3675.
ieee: G. M. Lemoult, L. Shi, K. Avila, S. V. Jalikop, M. Avila, and B. Hof, “Directed
percolation phase transition to sustained turbulence in Couette flow,” Nature
Physics, vol. 12, no. 3. Nature Publishing Group, pp. 254–258, 2016.
ista: Lemoult GM, Shi L, Avila K, Jalikop SV, Avila M, Hof B. 2016. Directed percolation
phase transition to sustained turbulence in Couette flow. Nature Physics. 12(3),
254–258.
mla: Lemoult, Grégoire M., et al. “Directed Percolation Phase Transition to Sustained
Turbulence in Couette Flow.” Nature Physics, vol. 12, no. 3, Nature Publishing
Group, 2016, pp. 254–58, doi:10.1038/nphys3675.
short: G.M. Lemoult, L. Shi, K. Avila, S.V. Jalikop, M. Avila, B. Hof, Nature Physics
12 (2016) 254–258.
date_created: 2018-12-11T11:52:21Z
date_published: 2016-02-15T00:00:00Z
date_updated: 2021-01-12T06:51:08Z
day: '15'
department:
- _id: BjHo
doi: 10.1038/nphys3675
ec_funded: 1
intvolume: ' 12'
issue: '3'
language:
- iso: eng
month: '02'
oa_version: None
page: 254 - 258
project:
- _id: 25152F3A-B435-11E9-9278-68D0E5697425
call_identifier: FP7
grant_number: '306589'
name: Decoding the complexity of turbulence at its origin
- _id: 2511D90C-B435-11E9-9278-68D0E5697425
grant_number: SFB 963 TP A8
name: Astrophysical instability of currents and turbulences
publication: Nature Physics
publication_status: published
publisher: Nature Publishing Group
publist_id: '5685'
quality_controlled: '1'
scopus_import: 1
status: public
title: Directed percolation phase transition to sustained turbulence in Couette flow
type: journal_article
user_id: 3E5EF7F0-F248-11E8-B48F-1D18A9856A87
volume: 12
year: '2016'
...
---
_id: '1664'
abstract:
- lang: eng
text: Over a century of research into the origin of turbulence in wall-bounded shear
flows has resulted in a puzzling picture in which turbulence appears in a variety
of different states competing with laminar background flow. At moderate flow speeds,
turbulence is confined to localized patches; it is only at higher speeds that
the entire flow becomes turbulent. The origin of the different states encountered
during this transition, the front dynamics of the turbulent regions and the transformation
to full turbulence have yet to be explained. By combining experiments, theory
and computer simulations, here we uncover a bifurcation scenario that explains
the transformation to fully turbulent pipe flow and describe the front dynamics
of the different states encountered in the process. Key to resolving this problem
is the interpretation of the flow as a bistable system with nonlinear propagation
(advection) of turbulent fronts. These findings bridge the gap between our understanding
of the onset of turbulence and fully turbulent flows.
acknowledgement: We acknowledge the Deutsche Forschungsgemeinschaft (Project No. FOR
1182), and the European Research Council under the European Union’s Seventh Framework
Programme (FP/2007-2013)/ERC Grant Agreement 306589 for financial support. B.S.
acknowledges financial support from the Chinese State Scholarship Fund under grant
number 2010629145. B.S. acknowledges support from the International Max Planck Research
School for the Physics of Biological and Complex Systems and the Göttingen Graduate
School for Neurosciences and Molecular Biosciences. We acknowledge computing resources
from GWDG (Gesellschaft für wissenschaftliche Datenverarbeitung Göttingen) and the
Jülich Supercomputing Centre (grant HGU16) where the simulations were performed.
author:
- first_name: Dwight
full_name: Barkley, Dwight
last_name: Barkley
- first_name: Baofang
full_name: Song, Baofang
last_name: Song
- first_name: Mukund
full_name: Vasudevan, Mukund
id: 3C5A959A-F248-11E8-B48F-1D18A9856A87
last_name: Vasudevan
- first_name: Grégoire M
full_name: Lemoult, Grégoire M
id: 4787FE80-F248-11E8-B48F-1D18A9856A87
last_name: Lemoult
- first_name: Marc
full_name: Avila, Marc
last_name: Avila
- first_name: Björn
full_name: Hof, Björn
id: 3A374330-F248-11E8-B48F-1D18A9856A87
last_name: Hof
orcid: 0000-0003-2057-2754
citation:
ama: Barkley D, Song B, Vasudevan M, Lemoult GM, Avila M, Hof B. The rise of fully
turbulent flow. Nature. 2015;526(7574):550-553. doi:10.1038/nature15701
apa: Barkley, D., Song, B., Vasudevan, M., Lemoult, G. M., Avila, M., & Hof,
B. (2015). The rise of fully turbulent flow. Nature. Nature Publishing
Group. https://doi.org/10.1038/nature15701
chicago: Barkley, Dwight, Baofang Song, Mukund Vasudevan, Grégoire M Lemoult, Marc
Avila, and Björn Hof. “The Rise of Fully Turbulent Flow.” Nature. Nature
Publishing Group, 2015. https://doi.org/10.1038/nature15701.
ieee: D. Barkley, B. Song, M. Vasudevan, G. M. Lemoult, M. Avila, and B. Hof, “The
rise of fully turbulent flow,” Nature, vol. 526, no. 7574. Nature Publishing
Group, pp. 550–553, 2015.
ista: Barkley D, Song B, Vasudevan M, Lemoult GM, Avila M, Hof B. 2015. The rise
of fully turbulent flow. Nature. 526(7574), 550–553.
mla: Barkley, Dwight, et al. “The Rise of Fully Turbulent Flow.” Nature,
vol. 526, no. 7574, Nature Publishing Group, 2015, pp. 550–53, doi:10.1038/nature15701.
short: D. Barkley, B. Song, M. Vasudevan, G.M. Lemoult, M. Avila, B. Hof, Nature
526 (2015) 550–553.
date_created: 2018-12-11T11:53:20Z
date_published: 2015-10-21T00:00:00Z
date_updated: 2021-01-12T06:52:22Z
day: '21'
department:
- _id: BjHo
doi: 10.1038/nature15701
ec_funded: 1
intvolume: ' 526'
issue: '7574'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: http://arxiv.org/abs/1510.09143
month: '10'
oa: 1
oa_version: Preprint
page: 550 - 553
project:
- _id: 25152F3A-B435-11E9-9278-68D0E5697425
call_identifier: FP7
grant_number: '306589'
name: Decoding the complexity of turbulence at its origin
publication: Nature
publication_status: published
publisher: Nature Publishing Group
publist_id: '5485'
quality_controlled: '1'
scopus_import: 1
status: public
title: The rise of fully turbulent flow
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 526
year: '2015'
...
---
_id: '1679'
article_number: '091102'
author:
- first_name: Grégoire M
full_name: Lemoult, Grégoire M
id: 4787FE80-F248-11E8-B48F-1D18A9856A87
last_name: Lemoult
- first_name: Philipp
full_name: Maier, Philipp
id: 384F7C04-F248-11E8-B48F-1D18A9856A87
last_name: Maier
- 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, Maier P, Hof B. Taylor’s Forest. Physics of Fluids. 2015;27(9).
doi:10.1063/1.4930850
apa: Lemoult, G. M., Maier, P., & Hof, B. (2015). Taylor’s Forest. Physics
of Fluids. American Institute of Physics. https://doi.org/10.1063/1.4930850
chicago: Lemoult, Grégoire M, Philipp Maier, and Björn Hof. “Taylor’s Forest.” Physics
of Fluids. American Institute of Physics, 2015. https://doi.org/10.1063/1.4930850.
ieee: G. M. Lemoult, P. Maier, and B. Hof, “Taylor’s Forest,” Physics of Fluids,
vol. 27, no. 9. American Institute of Physics, 2015.
ista: Lemoult GM, Maier P, Hof B. 2015. Taylor’s Forest. Physics of Fluids. 27(9),
091102.
mla: Lemoult, Grégoire M., et al. “Taylor’s Forest.” Physics of Fluids, vol.
27, no. 9, 091102, American Institute of Physics, 2015, doi:10.1063/1.4930850.
short: G.M. Lemoult, P. Maier, B. Hof, Physics of Fluids 27 (2015).
date_created: 2018-12-11T11:53:26Z
date_published: 2015-09-24T00:00:00Z
date_updated: 2021-01-12T06:52:28Z
day: '24'
ddc:
- '532'
department:
- _id: BjHo
doi: 10.1063/1.4930850
file:
- access_level: open_access
checksum: 604bba3c2496aadb3efcff77de01ce6c
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creator: system
date_created: 2018-12-12T10:13:35Z
date_updated: 2020-07-14T12:45:12Z
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file_size: 872366
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has_accepted_license: '1'
intvolume: ' 27'
issue: '9'
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oa: 1
oa_version: Published Version
publication: Physics of Fluids
publication_status: published
publisher: American Institute of Physics
publist_id: '5469'
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quality_controlled: '1'
scopus_import: 1
status: public
title: Taylor's Forest
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type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
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