---
_id: '1804'
abstract:
- lang: eng
text: It is known that in classical fluids turbulence typically occurs at high Reynolds
numbers. But can turbulence occur at low Reynolds numbers? Here we investigate
the transition to turbulence in the classic Taylor-Couette system in which the
rotating fluids are manufactured ferrofluids with magnetized nanoparticles embedded
in liquid carriers. We find that, in the presence of a magnetic field transverse
to the symmetry axis of the system, turbulence can occur at Reynolds numbers that
are at least one order of magnitude smaller than those in conventional fluids.
This is established by extensive computational ferrohydrodynamics through a detailed
investigation of transitions in the flow structure, and characterization of behaviors
of physical quantities such as the energy, the wave number, and the angular momentum
through the bifurcations. A finding is that, as the magnetic field is increased,
onset of turbulence can be determined accurately and reliably. Our results imply
that experimental investigation of turbulence may be feasible by using ferrofluids.
Our study of transition to and evolution of turbulence in the Taylor-Couette ferrofluidic
flow system provides insights into the challenging problem of turbulence control.
article_number: '10781'
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. Transition to turbulence in Taylor-Couette ferrofluidic
flow. Scientific Reports. 2015;5. doi:10.1038/srep10781
apa: Altmeyer, S., Do, Y., & Lai, Y. (2015). Transition to turbulence in Taylor-Couette
ferrofluidic flow. Scientific Reports. Nature Publishing Group. https://doi.org/10.1038/srep10781
chicago: Altmeyer, Sebastian, Younghae Do, and Ying Lai. “Transition to Turbulence
in Taylor-Couette Ferrofluidic Flow.” Scientific Reports. Nature Publishing
Group, 2015. https://doi.org/10.1038/srep10781.
ieee: S. Altmeyer, Y. Do, and Y. Lai, “Transition to turbulence in Taylor-Couette
ferrofluidic flow,” Scientific Reports, vol. 5. Nature Publishing Group,
2015.
ista: Altmeyer S, Do Y, Lai Y. 2015. Transition to turbulence in Taylor-Couette
ferrofluidic flow. Scientific Reports. 5, 10781.
mla: Altmeyer, Sebastian, et al. “Transition to Turbulence in Taylor-Couette Ferrofluidic
Flow.” Scientific Reports, vol. 5, 10781, Nature Publishing Group, 2015,
doi:10.1038/srep10781.
short: S. Altmeyer, Y. Do, Y. Lai, Scientific Reports 5 (2015).
date_created: 2018-12-11T11:54:06Z
date_published: 2015-06-12T00:00:00Z
date_updated: 2021-01-12T06:53:18Z
day: '12'
ddc:
- '530'
department:
- _id: BjHo
doi: 10.1038/srep10781
file:
- access_level: open_access
checksum: 7716f582f8c9d82d8f2bf80bf896b440
content_type: application/pdf
creator: system
date_created: 2018-12-12T10:17:26Z
date_updated: 2020-07-14T12:45:16Z
file_id: '5280'
file_name: IST-2016-450-v1+1_srep10781.pdf
file_size: 2449723
relation: main_file
file_date_updated: 2020-07-14T12:45:16Z
has_accepted_license: '1'
intvolume: ' 5'
language:
- iso: eng
month: '06'
oa: 1
oa_version: Published Version
publication: Scientific Reports
publication_status: published
publisher: Nature Publishing Group
publist_id: '5306'
pubrep_id: '450'
quality_controlled: '1'
scopus_import: 1
status: public
title: Transition to turbulence in Taylor-Couette ferrofluidic 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: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 5
year: '2015'
...
---
_id: '1837'
abstract:
- lang: eng
text: 'Transition to turbulence in straight pipes occurs in spite of the linear
stability of the laminar Hagen-Poiseuille flow if both the amplitude of flow perturbations
and the Reynolds number Re exceed a minimum threshold (subcritical transition).
As the pipe curvature increases, centrifugal effects become important, modifying
the basic flow as well as the most unstable linear modes. If the curvature (tube-to-coiling
diameter d/D) is sufficiently large, a Hopf bifurcation (supercritical instability)
is encountered before turbulence can be excited (subcritical instability). We
trace the instability thresholds in the Re - d/D parameter space in the range
0.01 ≤ d/D\ ≤ 0.1 by means of laser-Doppler velocimetry and determine the point
where the subcritical and supercritical instabilities meet. Two different experimental
set-ups are used: a closed system where the pipe forms an axisymmetric torus and
an open system employing a helical pipe. Implications for the measurement of friction
factors in curved pipes are discussed.'
article_number: R3
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Jakob
full_name: Kühnen, Jakob
id: 3A47AE32-F248-11E8-B48F-1D18A9856A87
last_name: Kühnen
orcid: 0000-0003-4312-0179
- first_name: P
full_name: Braunshier, P
last_name: Braunshier
- first_name: M
full_name: Schwegel, M
last_name: Schwegel
- first_name: Hendrik
full_name: Kuhlmann, Hendrik
last_name: Kuhlmann
- 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, Braunshier P, Schwegel M, Kuhlmann H, Hof B. Subcritical versus supercritical
transition to turbulence in curved pipes. Journal of Fluid Mechanics. 2015;770(5).
doi:10.1017/jfm.2015.184
apa: Kühnen, J., Braunshier, P., Schwegel, M., Kuhlmann, H., & Hof, B. (2015).
Subcritical versus supercritical transition to turbulence in curved pipes. Journal
of Fluid Mechanics. Cambridge University Press. https://doi.org/10.1017/jfm.2015.184
chicago: Kühnen, Jakob, P Braunshier, M Schwegel, Hendrik Kuhlmann, and Björn Hof.
“Subcritical versus Supercritical Transition to Turbulence in Curved Pipes.” Journal
of Fluid Mechanics. Cambridge University Press, 2015. https://doi.org/10.1017/jfm.2015.184.
ieee: J. Kühnen, P. Braunshier, M. Schwegel, H. Kuhlmann, and B. Hof, “Subcritical
versus supercritical transition to turbulence in curved pipes,” Journal of
Fluid Mechanics, vol. 770, no. 5. Cambridge University Press, 2015.
ista: Kühnen J, Braunshier P, Schwegel M, Kuhlmann H, Hof B. 2015. Subcritical versus
supercritical transition to turbulence in curved pipes. Journal of Fluid Mechanics.
770(5), R3.
mla: Kühnen, Jakob, et al. “Subcritical versus Supercritical Transition to Turbulence
in Curved Pipes.” Journal of Fluid Mechanics, vol. 770, no. 5, R3, Cambridge
University Press, 2015, doi:10.1017/jfm.2015.184.
short: J. Kühnen, P. Braunshier, M. Schwegel, H. Kuhlmann, B. Hof, Journal of Fluid
Mechanics 770 (2015).
date_created: 2018-12-11T11:54:17Z
date_published: 2015-04-08T00:00:00Z
date_updated: 2021-01-12T06:53:31Z
day: '08'
department:
- _id: BjHo
doi: 10.1017/jfm.2015.184
ec_funded: 1
external_id:
arxiv:
- '1508.06559'
intvolume: ' 770'
issue: '5'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1508.06559
month: '04'
oa: 1
oa_version: Preprint
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_status: published
publisher: Cambridge University Press
publist_id: '5265'
quality_controlled: '1'
scopus_import: 1
status: public
title: Subcritical versus supercritical transition to turbulence in curved pipes
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 770
year: '2015'
...
---
_id: '1868'
abstract:
- lang: eng
text: We investigate high-dimensional nonlinear dynamical systems exhibiting multiple
resonances under adiabatic parameter variations. Our motivations come from experimental
considerations where time-dependent sweeping of parameters is a practical approach
to probing and characterizing the bifurcations of the system. The question is
whether bifurcations so detected are faithful representations of the bifurcations
intrinsic to the original stationary system. Utilizing a harmonically forced,
closed fluid flow system that possesses multiple resonances and solving the Navier-Stokes
equation under proper boundary conditions, we uncover the phenomenon of the early
effect. Specifically, as a control parameter, e.g., the driving frequency, is
adiabatically increased from an initial value, resonances emerge at frequency
values that are lower than those in the corresponding stationary system. The phenomenon
is established by numerical characterization of physical quantities through the
resonances, which include the kinetic energy and the vorticity field, and a heuristic
analysis based on the concept of instantaneous frequency. A simple formula is
obtained which relates the resonance points in the time-dependent and time-independent
systems. Our findings suggest that, in general, any true bifurcation of a nonlinear
dynamical system can be unequivocally uncovered through adiabatic parameter sweeping,
in spite of a shift in the bifurcation point, which is of value to experimental
studies of nonlinear dynamical systems.
article_number: '022906'
author:
- first_name: Youngyong
full_name: Park, Youngyong
last_name: Park
- first_name: Younghae
full_name: Do, Younghae
last_name: Do
- first_name: Sebastian
full_name: Altmeyer, Sebastian
id: 2EE67FDC-F248-11E8-B48F-1D18A9856A87
last_name: Altmeyer
orcid: 0000-0001-5964-0203
- first_name: Yingcheng
full_name: Lai, Yingcheng
last_name: Lai
- first_name: Gyuwon
full_name: Lee, Gyuwon
last_name: Lee
citation:
ama: Park Y, Do Y, Altmeyer S, Lai Y, Lee G. Early effect in time-dependent, high-dimensional
nonlinear dynamical systems with multiple resonances. Physical Review E.
2015;91(2). doi:10.1103/PhysRevE.91.022906
apa: Park, Y., Do, Y., Altmeyer, S., Lai, Y., & Lee, G. (2015). Early effect
in time-dependent, high-dimensional nonlinear dynamical systems with multiple
resonances. Physical Review E. American Physical Society. https://doi.org/10.1103/PhysRevE.91.022906
chicago: Park, Youngyong, Younghae Do, Sebastian Altmeyer, Yingcheng Lai, and Gyuwon
Lee. “Early Effect in Time-Dependent, High-Dimensional Nonlinear Dynamical Systems
with Multiple Resonances.” Physical Review E. American Physical Society,
2015. https://doi.org/10.1103/PhysRevE.91.022906.
ieee: Y. Park, Y. Do, S. Altmeyer, Y. Lai, and G. Lee, “Early effect in time-dependent,
high-dimensional nonlinear dynamical systems with multiple resonances,” Physical
Review E, vol. 91, no. 2. American Physical Society, 2015.
ista: Park Y, Do Y, Altmeyer S, Lai Y, Lee G. 2015. Early effect in time-dependent,
high-dimensional nonlinear dynamical systems with multiple resonances. Physical
Review E. 91(2), 022906.
mla: Park, Youngyong, et al. “Early Effect in Time-Dependent, High-Dimensional Nonlinear
Dynamical Systems with Multiple Resonances.” Physical Review E, vol. 91,
no. 2, 022906, American Physical Society, 2015, doi:10.1103/PhysRevE.91.022906.
short: Y. Park, Y. Do, S. Altmeyer, Y. Lai, G. Lee, Physical Review E 91 (2015).
date_created: 2018-12-11T11:54:27Z
date_published: 2015-02-09T00:00:00Z
date_updated: 2021-01-12T06:53:44Z
day: '09'
department:
- _id: BjHo
doi: 10.1103/PhysRevE.91.022906
intvolume: ' 91'
issue: '2'
language:
- iso: eng
month: '02'
oa_version: None
publication: Physical Review E
publication_identifier:
issn:
- 1539-3755
publication_status: published
publisher: American Physical Society
publist_id: '5229'
quality_controlled: '1'
scopus_import: 1
status: public
title: Early effect in time-dependent, high-dimensional nonlinear dynamical systems
with multiple resonances
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 91
year: '2015'
...
---
_id: '2030'
abstract:
- lang: eng
text: A hybrid-parallel direct-numerical-simulation method with application to turbulent
Taylor-Couette flow is presented. The Navier-Stokes equations are discretized
in cylindrical coordinates with the spectral Fourier-Galerkin method in the axial
and azimuthal directions, and high-order finite differences in the radial direction.
Time is advanced by a second-order, semi-implicit projection scheme, which requires
the solution of five Helmholtz/Poisson equations, avoids staggered grids and renders
very small slip velocities. Nonlinear terms are evaluated with the pseudospectral
method. The code is parallelized using a hybrid MPI-OpenMP strategy, which, compared
with a flat MPI parallelization, is simpler to implement, allows to reduce inter-node
communications and MPI overhead that become relevant at high processor-core counts,
and helps to contain the memory footprint. A strong scaling study shows that the
hybrid code maintains scalability up to more than 20,000 processor cores and thus
allows to perform simulations at higher resolutions than previously feasible.
In particular, it opens up the possibility to simulate turbulent Taylor-Couette
flows at Reynolds numbers up to O(105). This enables to probe hydrodynamic turbulence
in Keplerian flows in experimentally relevant regimes.
author:
- first_name: Liang
full_name: Shi, Liang
id: 374A3F1A-F248-11E8-B48F-1D18A9856A87
last_name: Shi
- first_name: Markus
full_name: Rampp, Markus
last_name: Rampp
- 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: Shi L, Rampp M, Hof B, Avila M. A hybrid MPI-OpenMP parallel implementation
for pseudospectral simulations with application to Taylor-Couette flow. Computers
and Fluids. 2015;106(1):1-11. doi:10.1016/j.compfluid.2014.09.021
apa: Shi, L., Rampp, M., Hof, B., & Avila, M. (2015). A hybrid MPI-OpenMP parallel
implementation for pseudospectral simulations with application to Taylor-Couette
flow. Computers and Fluids. Elsevier. https://doi.org/10.1016/j.compfluid.2014.09.021
chicago: Shi, Liang, Markus Rampp, Björn Hof, and Marc Avila. “A Hybrid MPI-OpenMP
Parallel Implementation for Pseudospectral Simulations with Application to Taylor-Couette
Flow.” Computers and Fluids. Elsevier, 2015. https://doi.org/10.1016/j.compfluid.2014.09.021.
ieee: L. Shi, M. Rampp, B. Hof, and M. Avila, “A hybrid MPI-OpenMP parallel implementation
for pseudospectral simulations with application to Taylor-Couette flow,” Computers
and Fluids, vol. 106, no. 1. Elsevier, pp. 1–11, 2015.
ista: Shi L, Rampp M, Hof B, Avila M. 2015. A hybrid MPI-OpenMP parallel implementation
for pseudospectral simulations with application to Taylor-Couette flow. Computers
and Fluids. 106(1), 1–11.
mla: Shi, Liang, et al. “A Hybrid MPI-OpenMP Parallel Implementation for Pseudospectral
Simulations with Application to Taylor-Couette Flow.” Computers and Fluids,
vol. 106, no. 1, Elsevier, 2015, pp. 1–11, doi:10.1016/j.compfluid.2014.09.021.
short: L. Shi, M. Rampp, B. Hof, M. Avila, Computers and Fluids 106 (2015) 1–11.
date_created: 2018-12-11T11:55:18Z
date_published: 2015-01-01T00:00:00Z
date_updated: 2021-01-12T06:54:51Z
day: '01'
department:
- _id: BjHo
doi: 10.1016/j.compfluid.2014.09.021
intvolume: ' 106'
issue: '1'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: http://arxiv.org/abs/1311.2481
month: '01'
oa: 1
oa_version: Preprint
page: 1 - 11
publication: Computers and Fluids
publication_status: published
publisher: Elsevier
publist_id: '5042'
quality_controlled: '1'
scopus_import: 1
status: public
title: A hybrid MPI-OpenMP parallel implementation for pseudospectral simulations
with application to Taylor-Couette flow
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 106
year: '2015'
...
---
_id: '1588'
abstract:
- lang: eng
text: 'We investigate the Taylor-Couette system where the radius ratio is close
to unity. Systematically increasing the Reynolds number, we observe a number of
previously known transitions, such as one from the classical Taylor vortex flow
(TVF) to wavy vortex flow (WVF) and the transition to fully developed turbulence.
Prior to the onset of turbulence, we observe intermittent bursting patterns of
localized turbulent patches, confirming the experimentally observed pattern of
very short wavelength bursts (VSWBs). A striking finding is that, for a Reynolds
number larger than that for the onset of VSWBs, a new type of intermittently bursting
behavior emerges: patterns of azimuthally closed rings of various orders. We call
them ring-bursting patterns, which surround the cylinder completely but remain
localized and separated in the axial direction through nonturbulent wavy structures.
We employ a number of quantitative measures including the cross-flow energy to
characterize the ring-bursting patterns and to distinguish them from the background
flow. These patterns are interesting because they do not occur in the wide-gap
Taylor-Couette flow systems. The narrow-gap regime is less studied but certainly
deserves further attention to gain deeper insights into complex flow dynamics
in fluids.'
article_number: '053018'
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. Ring-bursting behavior en route to turbulence in narrow-gap
Taylor-Couette flows. Physical Review E. 2015;92(5). doi:10.1103/PhysRevE.92.053018
apa: Altmeyer, S., Do, Y., & Lai, Y. (2015). Ring-bursting behavior en route
to turbulence in narrow-gap Taylor-Couette flows. Physical Review E. American
Physical Society. https://doi.org/10.1103/PhysRevE.92.053018
chicago: Altmeyer, Sebastian, Younghae Do, and Ying Lai. “Ring-Bursting Behavior
En Route to Turbulence in Narrow-Gap Taylor-Couette Flows.” Physical Review
E. American Physical Society, 2015. https://doi.org/10.1103/PhysRevE.92.053018.
ieee: S. Altmeyer, Y. Do, and Y. Lai, “Ring-bursting behavior en route to turbulence
in narrow-gap Taylor-Couette flows,” Physical Review E, vol. 92, no. 5.
American Physical Society, 2015.
ista: Altmeyer S, Do Y, Lai Y. 2015. Ring-bursting behavior en route to turbulence
in narrow-gap Taylor-Couette flows. Physical Review E. 92(5), 053018.
mla: Altmeyer, Sebastian, et al. “Ring-Bursting Behavior En Route to Turbulence
in Narrow-Gap Taylor-Couette Flows.” Physical Review E, vol. 92, no. 5,
053018, American Physical Society, 2015, doi:10.1103/PhysRevE.92.053018.
short: S. Altmeyer, Y. Do, Y. Lai, Physical Review E 92 (2015).
date_created: 2018-12-11T11:52:53Z
date_published: 2015-11-24T00:00:00Z
date_updated: 2021-01-12T06:51:47Z
day: '24'
department:
- _id: BjHo
doi: 10.1103/PhysRevE.92.053018
intvolume: ' 92'
issue: '5'
language:
- iso: eng
month: '11'
oa_version: None
publication: Physical Review E
publication_status: published
publisher: American Physical Society
publist_id: '5583'
quality_controlled: '1'
scopus_import: 1
status: public
title: Ring-bursting behavior en route to turbulence in narrow-gap Taylor-Couette
flows
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 92
year: '2015'
...
---
_id: '1589'
abstract:
- lang: eng
text: We investigate the dynamics of ferrofluidic wavy vortex flows in the counter-rotating
Taylor-Couette system, with a focus on wavy flows with a mixture of the dominant
azimuthal modes. Without external magnetic field flows are stable and pro-grade
with respect to the rotation of the inner cylinder. More complex behaviors can
arise when an axial or a transverse magnetic field is applied. Depending on the
direction and strength of the field, multi-stable wavy states and bifurcations
can occur. We uncover the phenomenon of flow pattern reversal as the strength
of the magnetic field is increased through a critical value. In between the regimes
of pro-grade and retrograde flow rotations, standing waves with zero angular velocities
can emerge. A striking finding is that, under a transverse magnetic field, a second
reversal in the flow pattern direction can occur, where the flow pattern evolves
into pro-grade rotation again from a retrograde state. Flow reversal is relevant
to intriguing phenomena in nature such as geomagnetic reversal. Our results suggest
that, in ferrofluids, flow pattern reversal can be induced by varying a magnetic
field in a controlled manner, which can be realized in laboratory experiments
with potential applications in the development of modern fluid devices.
article_number: '18589'
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: Ying
full_name: Lai, Ying
last_name: Lai
citation:
ama: Altmeyer S, Do Y, Lai Y. Magnetic field induced flow pattern reversal in a
ferrofluidic Taylor-Couette system. Scientific Reports. 2015;5. doi:10.1038/srep18589
apa: Altmeyer, S., Do, Y., & Lai, Y. (2015). Magnetic field induced flow pattern
reversal in a ferrofluidic Taylor-Couette system. Scientific Reports. Nature
Publishing Group. https://doi.org/10.1038/srep18589
chicago: Altmeyer, Sebastian, Younghae Do, and Ying Lai. “Magnetic Field Induced
Flow Pattern Reversal in a Ferrofluidic Taylor-Couette System.” Scientific
Reports. Nature Publishing Group, 2015. https://doi.org/10.1038/srep18589.
ieee: S. Altmeyer, Y. Do, and Y. Lai, “Magnetic field induced flow pattern reversal
in a ferrofluidic Taylor-Couette system,” Scientific Reports, vol. 5. Nature
Publishing Group, 2015.
ista: Altmeyer S, Do Y, Lai Y. 2015. Magnetic field induced flow pattern reversal
in a ferrofluidic Taylor-Couette system. Scientific Reports. 5, 18589.
mla: Altmeyer, Sebastian, et al. “Magnetic Field Induced Flow Pattern Reversal in
a Ferrofluidic Taylor-Couette System.” Scientific Reports, vol. 5, 18589,
Nature Publishing Group, 2015, doi:10.1038/srep18589.
short: S. Altmeyer, Y. Do, Y. Lai, Scientific Reports 5 (2015).
date_created: 2018-12-11T11:52:53Z
date_published: 2015-12-21T00:00:00Z
date_updated: 2021-01-12T06:51:48Z
day: '21'
ddc:
- '530'
- '540'
department:
- _id: BjHo
doi: 10.1038/srep18589
file:
- access_level: open_access
checksum: 927e151674347661ce36eae2818dafdc
content_type: application/pdf
creator: system
date_created: 2018-12-12T10:13:49Z
date_updated: 2020-07-14T12:45:03Z
file_id: '5036'
file_name: IST-2016-472-v1+1_srep18589.pdf
file_size: 2771236
relation: main_file
file_date_updated: 2020-07-14T12:45:03Z
has_accepted_license: '1'
intvolume: ' 5'
language:
- iso: eng
month: '12'
oa: 1
oa_version: Published Version
publication: Scientific Reports
publication_status: published
publisher: Nature Publishing Group
publist_id: '5582'
pubrep_id: '472'
quality_controlled: '1'
scopus_import: 1
status: public
title: Magnetic field induced flow pattern reversal in a ferrofluidic Taylor-Couette
system
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: 5
year: '2015'
...
---
_id: '2050'
abstract:
- lang: eng
text: The flow instability and further transition to turbulence in a toroidal pipe
(torus) with curvature ratio (tube-to-coiling diameter) 0.049 is investigated
experimentally. The flow inside the toroidal pipe is driven by a steel sphere
fitted to the inner pipe diameter. The sphere is moved with constant azimuthal
velocity from outside the torus by a moving magnet. The experiment is designed
to investigate curved pipe flow by optical measurement techniques. Using stereoscopic
particle image velocimetry, laser Doppler velocimetry and pressure drop measurements,
the flow is measured for Reynolds numbers ranging from 1000 to 15 000. Time- and
space-resolved velocity fields are obtained and analysed. The steady axisymmetric
basic flow is strongly influenced by centrifugal effects. On an increase of the
Reynolds number we find a sequence of bifurcations. For Re=4075±2% a supercritical
bifurcation to an oscillatory flow is found in which waves travel in the streamwise
direction with a phase velocity slightly faster than the mean flow. The oscillatory
flow is superseded by a presumably quasi-periodic flow at a further increase of
the Reynolds number before turbulence sets in. The results are found to be compatible,
in general, with earlier experimental and numerical investigations on transition
to turbulence in helical and curved pipes. However, important aspects of the bifurcation
scenario differ considerably.
article_processing_charge: No
arxiv: 1
author:
- first_name: Jakob
full_name: Kühnen, Jakob
id: 3A47AE32-F248-11E8-B48F-1D18A9856A87
last_name: Kühnen
orcid: 0000-0003-4312-0179
- first_name: Markus
full_name: Holzner, Markus
last_name: Holzner
- first_name: Björn
full_name: Hof, Björn
id: 3A374330-F248-11E8-B48F-1D18A9856A87
last_name: Hof
orcid: 0000-0003-2057-2754
- first_name: Hendrik
full_name: Kuhlmann, Hendrik
last_name: Kuhlmann
citation:
ama: Kühnen J, Holzner M, Hof B, Kuhlmann H. Experimental investigation of transitional
flow in a toroidal pipe. Journal of Fluid Mechanics. 2014;738:463-491.
doi:10.1017/jfm.2013.603
apa: Kühnen, J., Holzner, M., Hof, B., & Kuhlmann, H. (2014). Experimental investigation
of transitional flow in a toroidal pipe. Journal of Fluid Mechanics. Cambridge
University Press. https://doi.org/10.1017/jfm.2013.603
chicago: Kühnen, Jakob, Markus Holzner, Björn Hof, and Hendrik Kuhlmann. “Experimental
Investigation of Transitional Flow in a Toroidal Pipe.” Journal of Fluid Mechanics.
Cambridge University Press, 2014. https://doi.org/10.1017/jfm.2013.603.
ieee: J. Kühnen, M. Holzner, B. Hof, and H. Kuhlmann, “Experimental investigation
of transitional flow in a toroidal pipe,” Journal of Fluid Mechanics, vol.
738. Cambridge University Press, pp. 463–491, 2014.
ista: Kühnen J, Holzner M, Hof B, Kuhlmann H. 2014. Experimental investigation of
transitional flow in a toroidal pipe. Journal of Fluid Mechanics. 738, 463–491.
mla: Kühnen, Jakob, et al. “Experimental Investigation of Transitional Flow in a
Toroidal Pipe.” Journal of Fluid Mechanics, vol. 738, Cambridge University
Press, 2014, pp. 463–91, doi:10.1017/jfm.2013.603.
short: J. Kühnen, M. Holzner, B. Hof, H. Kuhlmann, Journal of Fluid Mechanics 738
(2014) 463–491.
date_created: 2018-12-11T11:55:25Z
date_published: 2014-01-10T00:00:00Z
date_updated: 2021-01-12T06:54:59Z
day: '10'
department:
- _id: BjHo
doi: 10.1017/jfm.2013.603
external_id:
arxiv:
- '1508.06546'
intvolume: ' 738'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1508.06546
month: '01'
oa: 1
oa_version: Submitted Version
page: 463 - 491
publication: Journal of Fluid Mechanics
publication_status: published
publisher: Cambridge University Press
publist_id: '5001'
quality_controlled: '1'
scopus_import: 1
status: public
title: Experimental investigation of transitional flow in a toroidal pipe
type: journal_article
user_id: 3E5EF7F0-F248-11E8-B48F-1D18A9856A87
volume: 738
year: '2014'
...
---
_id: '2224'
abstract:
- lang: eng
text: This work investigates the transition between different traveling helical
waves (spirals, SPIs) in the setup of differentially independent rotating cylinders.
We use direct numerical simulations to consider an infinite long and periodic
Taylor-Couette apparatus with fixed axial periodicity length. We find so-called
mixed-cross-spirals (MCSs), that can be seen as nonlinear superpositions of SPIs,
to establish stable footbridges connecting SPI states. While bridging the bifurcation
branches of SPIs, the corresponding contributions within the MCS vary continuously
with the control parameters. Here discussed MCSs presenting footbridge solutions
start and end in different SPI branches. Therefore they differ significantly from
the already known MCSs that present bypass solutions (Altmeyer and Hoffmann 2010
New J. Phys. 12 113035). The latter start and end in the same SPI branch, while
they always bifurcate out of those SPI branches with the larger mode amplitude.
Meanwhile, these only appear within the coexisting region of both SPIs. In contrast,
the footbridge solutions can also bifurcate out of the minor SPI contribution.
We also find they exist in regions where only one of the SPIs contributions exists.
In addition, MCS as footbridge solution can appear either stable or unstable.
The latter detected transient solutions offer similar spatio-temporal characteristics
to the flow establishing stable footbridges. Such transition processes are interesting
for pattern-forming systems in general because they accomplish transitions between
traveling waves of different azimuthal wave numbers and have not been described
in the literature yet.
article_number: '025503'
author:
- first_name: Sebastian
full_name: Altmeyer, Sebastian
id: 2EE67FDC-F248-11E8-B48F-1D18A9856A87
last_name: Altmeyer
orcid: 0000-0001-5964-0203
citation:
ama: Altmeyer S. On secondary instabilities generating footbridges between spiral
vortex flow. Fluid Dynamics Research. 2014;46(2). doi:10.1088/0169-5983/46/2/025503
apa: Altmeyer, S. (2014). On secondary instabilities generating footbridges between
spiral vortex flow. Fluid Dynamics Research. IOP Publishing Ltd. https://doi.org/10.1088/0169-5983/46/2/025503
chicago: Altmeyer, Sebastian. “On Secondary Instabilities Generating Footbridges
between Spiral Vortex Flow.” Fluid Dynamics Research. IOP Publishing Ltd.,
2014. https://doi.org/10.1088/0169-5983/46/2/025503.
ieee: S. Altmeyer, “On secondary instabilities generating footbridges between spiral
vortex flow,” Fluid Dynamics Research, vol. 46, no. 2. IOP Publishing Ltd.,
2014.
ista: Altmeyer S. 2014. On secondary instabilities generating footbridges between
spiral vortex flow. Fluid Dynamics Research. 46(2), 025503.
mla: Altmeyer, Sebastian. “On Secondary Instabilities Generating Footbridges between
Spiral Vortex Flow.” Fluid Dynamics Research, vol. 46, no. 2, 025503, IOP
Publishing Ltd., 2014, doi:10.1088/0169-5983/46/2/025503.
short: S. Altmeyer, Fluid Dynamics Research 46 (2014).
date_created: 2018-12-11T11:56:25Z
date_published: 2014-04-01T00:00:00Z
date_updated: 2021-01-12T06:56:07Z
day: '01'
department:
- _id: BjHo
doi: 10.1088/0169-5983/46/2/025503
intvolume: ' 46'
issue: '2'
language:
- iso: eng
month: '04'
oa_version: None
publication: Fluid Dynamics Research
publication_identifier:
issn:
- '01695983'
publication_status: published
publisher: IOP Publishing Ltd.
publist_id: '4740'
quality_controlled: '1'
scopus_import: 1
status: public
title: On secondary instabilities generating footbridges between spiral vortex flow
type: journal_article
user_id: 4435EBFC-F248-11E8-B48F-1D18A9856A87
volume: 46
year: '2014'
...
---
_id: '2226'
abstract:
- lang: eng
text: Coriolis force effects on shear flows are important in geophysical and astrophysical
contexts. We report a study on the linear stability and the transient energy growth
of the plane Couette flow with system rotation perpendicular to the shear direction.
External rotation causes linear instability. At small rotation rates, the onset
of linear instability scales inversely with the rotation rate and the optimal
transient growth in the linearly stable region is slightly enhanced ∼Re2. The
corresponding optimal initial perturbations are characterized by roll structures
inclined in the streamwise direction and are twisted under external rotation.
At large rotation rates, the transient growth is significantly inhibited and hence
linear stability analysis is a reliable indicator for instability.
article_number: '013001'
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: Andreas
full_name: Tilgner, Andreas
last_name: Tilgner
citation:
ama: Shi L, Hof B, Tilgner A. Transient growth of Ekman-Couette flow. Physical
Review E Statistical Nonlinear and Soft Matter Physics. 2014;89(1). doi:10.1103/PhysRevE.89.013001
apa: Shi, L., Hof, B., & Tilgner, A. (2014). Transient growth of Ekman-Couette
flow. Physical Review E Statistical Nonlinear and Soft Matter Physics.
American Institute of Physics. https://doi.org/10.1103/PhysRevE.89.013001
chicago: Shi, Liang, Björn Hof, and Andreas Tilgner. “Transient Growth of Ekman-Couette
Flow.” Physical Review E Statistical Nonlinear and Soft Matter Physics.
American Institute of Physics, 2014. https://doi.org/10.1103/PhysRevE.89.013001.
ieee: L. Shi, B. Hof, and A. Tilgner, “Transient growth of Ekman-Couette flow,”
Physical Review E Statistical Nonlinear and Soft Matter Physics, vol. 89,
no. 1. American Institute of Physics, 2014.
ista: Shi L, Hof B, Tilgner A. 2014. Transient growth of Ekman-Couette flow. Physical
Review E Statistical Nonlinear and Soft Matter Physics. 89(1), 013001.
mla: Shi, Liang, et al. “Transient Growth of Ekman-Couette Flow.” Physical Review
E Statistical Nonlinear and Soft Matter Physics, vol. 89, no. 1, 013001, American
Institute of Physics, 2014, doi:10.1103/PhysRevE.89.013001.
short: L. Shi, B. Hof, A. Tilgner, Physical Review E Statistical Nonlinear and Soft
Matter Physics 89 (2014).
date_created: 2018-12-11T11:56:26Z
date_published: 2014-01-06T00:00:00Z
date_updated: 2021-01-12T06:56:08Z
day: '06'
department:
- _id: BjHo
doi: 10.1103/PhysRevE.89.013001
intvolume: ' 89'
issue: '1'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: http://arxiv.org/abs/1312.5095
month: '01'
oa: 1
oa_version: Submitted Version
project:
- _id: 25BDE9A4-B435-11E9-9278-68D0E5697425
grant_number: SFB-TR3-TP10B
name: Glutamaterge synaptische Übertragung und Plastizität in hippocampalen Mikroschaltkreisen
publication: Physical Review E Statistical Nonlinear and Soft Matter Physics
publication_identifier:
issn:
- '15393755'
publication_status: published
publisher: American Institute of Physics
publist_id: '4737'
quality_controlled: '1'
scopus_import: 1
status: public
title: Transient growth of Ekman-Couette flow
type: journal_article
user_id: 4435EBFC-F248-11E8-B48F-1D18A9856A87
volume: 89
year: '2014'
...
---
_id: '2232'
abstract:
- lang: eng
text: The purpose of this contribution is to summarize and discuss recent advances
regarding the onset of turbulence in shear flows. The absence of a clear-cut instability
mechanism, the spatio-temporal intermittent character and extremely long lived
transients are some of the major difficulties encountered in these flows and have
hindered progress towards understanding the transition process. We will show for
the case of pipe flow that concepts from nonlinear dynamics and statistical physics
can help to explain the onset of turbulence. In particular, the turbulent structures
(puffs) observed close to onset are spatially localized chaotic transients and
their lifetimes increase super-exponentially with Reynolds number. At the same
time fluctuations of individual turbulent puffs can (although very rarely) lead
to the nucleation of new puffs. The competition between these two stochastic processes
gives rise to a non-equilibrium phase transition where turbulence changes from
a super-transient to a sustained state.
article_number: P02001
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Baofang
full_name: Song, Baofang
id: a79e57f5-e8a5-11ec-9dc9-83fb8c81cf72
last_name: Song
- first_name: Björn
full_name: Hof, Björn
id: 3A374330-F248-11E8-B48F-1D18A9856A87
last_name: Hof
orcid: 0000-0003-2057-2754
citation:
ama: Song B, Hof B. Deterministic and stochastic aspects of the transition to turbulence.
Journal of Statistical Mechanics Theory and Experiment. 2014;2014(2). doi:10.1088/1742-5468/2014/02/P02001
apa: Song, B., & Hof, B. (2014). Deterministic and stochastic aspects of the
transition to turbulence. Journal of Statistical Mechanics Theory and Experiment.
IOP Publishing. https://doi.org/10.1088/1742-5468/2014/02/P02001
chicago: Song, Baofang, and Björn Hof. “Deterministic and Stochastic Aspects of
the Transition to Turbulence.” Journal of Statistical Mechanics Theory and
Experiment. IOP Publishing, 2014. https://doi.org/10.1088/1742-5468/2014/02/P02001.
ieee: B. Song and B. Hof, “Deterministic and stochastic aspects of the transition
to turbulence,” Journal of Statistical Mechanics Theory and Experiment,
vol. 2014, no. 2. IOP Publishing, 2014.
ista: Song B, Hof B. 2014. Deterministic and stochastic aspects of the transition
to turbulence. Journal of Statistical Mechanics Theory and Experiment. 2014(2),
P02001.
mla: Song, Baofang, and Björn Hof. “Deterministic and Stochastic Aspects of the
Transition to Turbulence.” Journal of Statistical Mechanics Theory and Experiment,
vol. 2014, no. 2, P02001, IOP Publishing, 2014, doi:10.1088/1742-5468/2014/02/P02001.
short: B. Song, B. Hof, Journal of Statistical Mechanics Theory and Experiment 2014
(2014).
date_created: 2018-12-11T11:56:28Z
date_published: 2014-02-01T00:00:00Z
date_updated: 2022-06-10T10:13:15Z
day: '01'
department:
- _id: BjHo
doi: 10.1088/1742-5468/2014/02/P02001
external_id:
arxiv:
- '1403.4516'
intvolume: ' 2014'
issue: '2'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: http://arxiv.org/abs/1403.4516
month: '02'
oa: 1
oa_version: Submitted Version
publication: Journal of Statistical Mechanics Theory and Experiment
publication_identifier:
issn:
- '17425468'
publication_status: published
publisher: IOP Publishing
publist_id: '4729'
quality_controlled: '1'
status: public
title: Deterministic and stochastic aspects of the transition to turbulence
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 2014
year: '2014'
...
---
_id: '2806'
abstract:
- lang: eng
text: A novel Taylor-Couette system has been constructed for investigations of transitional
as well as high Reynolds number turbulent flows in very large aspect ratios. The
flexibility of the setup enables studies of a variety of problems regarding hydrodynamic
instabilities and turbulence in rotating flows. The inner and outer cylinders
and the top and bottom endplates can be rotated independently with rotation rates
of up to 30 Hz, thereby covering five orders of magnitude in Reynolds numbers
(Re = 101-106). The radius ratio can be easily changed, the highest realized one
is η = 0.98 corresponding to an aspect ratio of 260 gap width in the vertical
and 300 in the azimuthal direction. For η < 0.98 the aspect ratio can be dynamically
changed during measurements and complete transparency in the radial direction
over the full length of the cylinders is provided by the usage of a precision
glass inner cylinder. The temperatures of both cylinders are controlled independently.
Overall this apparatus combines an unmatched variety in geometry, rotation rates,
and temperatures, which is provided by a sophisticated high-precision bearing
system. Possible applications are accurate studies of the onset of turbulence
and spatio-temporal intermittent flow patterns in very large domains, transport
processes of turbulence at high Re, the stability of Keplerian flows for different
boundary conditions, and studies of baroclinic instabilities.
article_number: '065106'
author:
- first_name: Kerstin
full_name: Avila, Kerstin
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: Avila K, Hof B. High-precision Taylor-Couette experiment to study subcritical
transitions and the role of boundary conditions and size effects. Review of
Scientific Instruments. 2013;84(6). doi:10.1063/1.4807704
apa: Avila, K., & Hof, B. (2013). High-precision Taylor-Couette experiment to
study subcritical transitions and the role of boundary conditions and size effects.
Review of Scientific Instruments. American Institute of Physics. https://doi.org/10.1063/1.4807704
chicago: Avila, Kerstin, and Björn Hof. “High-Precision Taylor-Couette Experiment
to Study Subcritical Transitions and the Role of Boundary Conditions and Size
Effects.” Review of Scientific Instruments. American Institute of Physics,
2013. https://doi.org/10.1063/1.4807704.
ieee: K. Avila and B. Hof, “High-precision Taylor-Couette experiment to study subcritical
transitions and the role of boundary conditions and size effects,” Review of
Scientific Instruments, vol. 84, no. 6. American Institute of Physics, 2013.
ista: Avila K, Hof B. 2013. High-precision Taylor-Couette experiment to study subcritical
transitions and the role of boundary conditions and size effects. Review of Scientific
Instruments. 84(6), 065106.
mla: Avila, Kerstin, and Björn Hof. “High-Precision Taylor-Couette Experiment to
Study Subcritical Transitions and the Role of Boundary Conditions and Size Effects.”
Review of Scientific Instruments, vol. 84, no. 6, 065106, American Institute
of Physics, 2013, doi:10.1063/1.4807704.
short: K. Avila, B. Hof, Review of Scientific Instruments 84 (2013).
date_created: 2018-12-11T11:59:42Z
date_published: 2013-06-06T00:00:00Z
date_updated: 2021-01-12T06:59:50Z
day: '06'
department:
- _id: BjHo
doi: 10.1063/1.4807704
intvolume: ' 84'
issue: '6'
language:
- iso: eng
month: '06'
oa_version: None
publication: Review of Scientific Instruments
publication_status: published
publisher: American Institute of Physics
publist_id: '4081'
quality_controlled: '1'
scopus_import: 1
status: public
title: High-precision Taylor-Couette experiment to study subcritical transitions and
the role of boundary conditions and size effects
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 84
year: '2013'
...
---
_id: '2811'
abstract:
- lang: eng
text: 'In pipe, channel, and boundary layer flows turbulence first occurs intermittently
in space and time: at moderate Reynolds numbers domains of disordered turbulent
motion are separated by quiescent laminar regions. Based on direct numerical simulations
of pipe flow we argue here that the spatial intermittency has its origin in a
nearest neighbor interaction between turbulent regions. We further show that in
this regime turbulent flows are intrinsically intermittent with a well-defined
equilibrium turbulent fraction but without ever assuming a steady pattern. This
transition scenario is analogous to that found in simple models such as coupled
map lattices. The scaling observed implies that laminar intermissions of the turbulent
flow will persist to arbitrarily large Reynolds numbers.'
article_number: '063012'
arxiv: 1
author:
- 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: Avila M, Hof B. Nature of laminar-turbulence intermittency in shear flows.
Physical Review E. 2013;87(6). doi:10.1103/PhysRevE.87.063012
apa: Avila, M., & Hof, B. (2013). Nature of laminar-turbulence intermittency
in shear flows. Physical Review E. American Institute of Physics. https://doi.org/10.1103/PhysRevE.87.063012
chicago: Avila, Marc, and Björn Hof. “Nature of Laminar-Turbulence Intermittency
in Shear Flows.” Physical Review E. American Institute of Physics, 2013.
https://doi.org/10.1103/PhysRevE.87.063012.
ieee: M. Avila and B. Hof, “Nature of laminar-turbulence intermittency in shear
flows,” Physical Review E, vol. 87, no. 6. American Institute of Physics,
2013.
ista: Avila M, Hof B. 2013. Nature of laminar-turbulence intermittency in shear
flows. Physical Review E. 87(6), 063012.
mla: Avila, Marc, and Björn Hof. “Nature of Laminar-Turbulence Intermittency in
Shear Flows.” Physical Review E, vol. 87, no. 6, 063012, American Institute
of Physics, 2013, doi:10.1103/PhysRevE.87.063012.
short: M. Avila, B. Hof, Physical Review E 87 (2013).
date_created: 2018-12-11T11:59:43Z
date_published: 2013-06-18T00:00:00Z
date_updated: 2021-01-12T06:59:53Z
day: '18'
department:
- _id: BjHo
doi: 10.1103/PhysRevE.87.063012
ec_funded: 1
external_id:
arxiv:
- '1306.5890'
intvolume: ' 87'
issue: '6'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: http://arxiv.org/abs/1306.5890
month: '06'
oa: 1
oa_version: Preprint
project:
- _id: 25152F3A-B435-11E9-9278-68D0E5697425
call_identifier: FP7
grant_number: '306589'
name: Decoding the complexity of turbulence at its origin
publication: Physical Review E
publication_status: published
publisher: American Institute of Physics
publist_id: '4074'
quality_controlled: '1'
scopus_import: 1
status: public
title: Nature of laminar-turbulence intermittency in shear flows
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 87
year: '2013'
...
---
_id: '2813'
abstract:
- lang: eng
text: Turbulence is ubiquitous in nature, yet even for the case of ordinary Newtonian
fluids like water, our understanding of this phenomenon is limited. Many liquids
of practical importance are more complicated (e.g., blood, polymer melts, paints),
however; they exhibit elastic as well as viscous characteristics, and the relation
between stress and strain is nonlinear. We demonstrate here for a model system
of such complex fluids that at high shear rates, turbulence is not simply modified
as previously believed but is suppressed and replaced by a different type of disordered
motion, elasto-inertial turbulence. Elasto-inertial turbulence is found to occur
at much lower Reynolds numbers than Newtonian turbulence, and the dynamical properties
differ significantly. The friction scaling observed coincides with the so-called
"maximum drag reduction" asymptote, which is exhibited by a wide range
of viscoelastic fluids.
author:
- first_name: Devranjan
full_name: Samanta, Devranjan
last_name: Samanta
- first_name: Yves
full_name: Dubief, Yves
last_name: Dubief
- first_name: Markus
full_name: Holzner, Markus
last_name: Holzner
- first_name: Christof
full_name: Schäfer, Christof
last_name: Schäfer
- first_name: Alexander
full_name: Morozov, Alexander
last_name: Morozov
- first_name: Christian
full_name: Wagner, Christian
last_name: Wagner
- first_name: Björn
full_name: Hof, Björn
id: 3A374330-F248-11E8-B48F-1D18A9856A87
last_name: Hof
orcid: 0000-0003-2057-2754
citation:
ama: Samanta D, Dubief Y, Holzner M, et al. Elasto-inertial turbulence. PNAS.
2013;110(26):10557-10562. doi:10.1073/pnas.1219666110
apa: Samanta, D., Dubief, Y., Holzner, M., Schäfer, C., Morozov, A., Wagner, C.,
& Hof, B. (2013). Elasto-inertial turbulence. PNAS. National Academy
of Sciences. https://doi.org/10.1073/pnas.1219666110
chicago: Samanta, Devranjan, Yves Dubief, Markus Holzner, Christof Schäfer, Alexander
Morozov, Christian Wagner, and Björn Hof. “Elasto-Inertial Turbulence.” PNAS.
National Academy of Sciences, 2013. https://doi.org/10.1073/pnas.1219666110.
ieee: D. Samanta et al., “Elasto-inertial turbulence,” PNAS, vol.
110, no. 26. National Academy of Sciences, pp. 10557–10562, 2013.
ista: Samanta D, Dubief Y, Holzner M, Schäfer C, Morozov A, Wagner C, Hof B. 2013.
Elasto-inertial turbulence. PNAS. 110(26), 10557–10562.
mla: Samanta, Devranjan, et al. “Elasto-Inertial Turbulence.” PNAS, vol.
110, no. 26, National Academy of Sciences, 2013, pp. 10557–62, doi:10.1073/pnas.1219666110.
short: D. Samanta, Y. Dubief, M. Holzner, C. Schäfer, A. Morozov, C. Wagner, B.
Hof, PNAS 110 (2013) 10557–10562.
date_created: 2018-12-11T11:59:44Z
date_published: 2013-06-25T00:00:00Z
date_updated: 2021-01-12T06:59:54Z
day: '25'
department:
- _id: BjHo
doi: 10.1073/pnas.1219666110
external_id:
pmid:
- '23757498'
intvolume: ' 110'
issue: '26'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3696777/
month: '06'
oa: 1
oa_version: Submitted Version
page: 10557 - 10562
pmid: 1
publication: PNAS
publication_status: published
publisher: National Academy of Sciences
publist_id: '4073'
quality_controlled: '1'
scopus_import: 1
status: public
title: Elasto-inertial turbulence
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 110
year: '2013'
...
---
_id: '2829'
abstract:
- lang: eng
text: Laminar-turbulent intermittency is intrinsic to the transitional regime of
a wide range of fluid flows including pipe, channel, boundary layer, and Couette
flow. In the latter turbulent spots can grow and form continuous stripes, yet
in the stripe-normal direction they remain interspersed by laminar fluid. We carry
out direct numerical simulations in a long narrow domain and observe that individual
turbulent stripes are transient. In agreement with recent observations in pipe
flow, we find that turbulence becomes sustained at a distinct critical point once
the spatial proliferation outweighs the inherent decaying process. By resolving
the asymptotic size distributions close to criticality we can for the first time
demonstrate scale invariance at the onset of turbulence.
article_number: '204502'
arxiv: 1
author:
- first_name: Liang
full_name: Shi, Liang
id: 374A3F1A-F248-11E8-B48F-1D18A9856A87
last_name: Shi
- 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: Shi L, Avila M, Hof B. Scale invariance at the onset of turbulence in couette
flow. Physical Review Letters. 2013;110(20). doi:10.1103/PhysRevLett.110.204502
apa: Shi, L., Avila, M., & Hof, B. (2013). Scale invariance at the onset of
turbulence in couette flow. Physical Review Letters. American Physical
Society. https://doi.org/10.1103/PhysRevLett.110.204502
chicago: Shi, Liang, Marc Avila, and Björn Hof. “Scale Invariance at the Onset of
Turbulence in Couette Flow.” Physical Review Letters. American Physical
Society, 2013. https://doi.org/10.1103/PhysRevLett.110.204502.
ieee: L. Shi, M. Avila, and B. Hof, “Scale invariance at the onset of turbulence
in couette flow,” Physical Review Letters, vol. 110, no. 20. American Physical
Society, 2013.
ista: Shi L, Avila M, Hof B. 2013. Scale invariance at the onset of turbulence in
couette flow. Physical Review Letters. 110(20), 204502.
mla: Shi, Liang, et al. “Scale Invariance at the Onset of Turbulence in Couette
Flow.” Physical Review Letters, vol. 110, no. 20, 204502, American Physical
Society, 2013, doi:10.1103/PhysRevLett.110.204502.
short: L. Shi, M. Avila, B. Hof, Physical Review Letters 110 (2013).
date_created: 2018-12-11T11:59:49Z
date_published: 2013-05-13T00:00:00Z
date_updated: 2021-01-12T07:00:00Z
day: '13'
department:
- _id: BjHo
doi: 10.1103/PhysRevLett.110.204502
ec_funded: 1
external_id:
arxiv:
- '1304.5446'
intvolume: ' 110'
issue: '20'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: http://arxiv.org/abs/1304.5446
month: '05'
oa: 1
oa_version: Preprint
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: Physical Review Letters
publication_status: published
publisher: American Physical Society
publist_id: '3970'
quality_controlled: '1'
scopus_import: 1
status: public
title: Scale invariance at the onset of turbulence in couette flow
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 110
year: '2013'
...
---
_id: '2834'
abstract:
- lang: eng
text: Although the equations governing fluid flow are well known, there are no analytical
expressions that describe the complexity of turbulent motion. A recent proposition
is that in analogy to low dimensional chaotic systems, turbulence is organized
around unstable solutions of the governing equations which provide the building
blocks of the disordered dynamics. We report the discovery of periodic solutions
which just like intermittent turbulence are spatially localized and show that
turbulent transients arise from one such solution branch.
article_number: '224502'
arxiv: 1
author:
- first_name: Marc
full_name: Avila, Marc
last_name: Avila
- first_name: Fernando
full_name: Mellibovsky, Fernando
last_name: Mellibovsky
- first_name: Nicolas
full_name: Roland, Nicolas
last_name: Roland
- first_name: Björn
full_name: Hof, Björn
id: 3A374330-F248-11E8-B48F-1D18A9856A87
last_name: Hof
orcid: 0000-0003-2057-2754
citation:
ama: Avila M, Mellibovsky F, Roland N, Hof B. Streamwise-localized solutions at
the onset of turbulence in pipe flow. Physical Review Letters. 2013;110(22).
doi:10.1103/PhysRevLett.110.224502
apa: Avila, M., Mellibovsky, F., Roland, N., & Hof, B. (2013). Streamwise-localized
solutions at the onset of turbulence in pipe flow. Physical Review Letters.
American Physical Society. https://doi.org/10.1103/PhysRevLett.110.224502
chicago: Avila, Marc, Fernando Mellibovsky, Nicolas Roland, and Björn Hof. “Streamwise-Localized
Solutions at the Onset of Turbulence in Pipe Flow.” Physical Review Letters.
American Physical Society, 2013. https://doi.org/10.1103/PhysRevLett.110.224502.
ieee: M. Avila, F. Mellibovsky, N. Roland, and B. Hof, “Streamwise-localized solutions
at the onset of turbulence in pipe flow,” Physical Review Letters, vol.
110, no. 22. American Physical Society, 2013.
ista: Avila M, Mellibovsky F, Roland N, Hof B. 2013. Streamwise-localized solutions
at the onset of turbulence in pipe flow. Physical Review Letters. 110(22), 224502.
mla: Avila, Marc, et al. “Streamwise-Localized Solutions at the Onset of Turbulence
in Pipe Flow.” Physical Review Letters, vol. 110, no. 22, 224502, American
Physical Society, 2013, doi:10.1103/PhysRevLett.110.224502.
short: M. Avila, F. Mellibovsky, N. Roland, B. Hof, Physical Review Letters 110
(2013).
date_created: 2018-12-11T11:59:50Z
date_published: 2013-05-29T00:00:00Z
date_updated: 2021-01-12T07:00:05Z
day: '29'
department:
- _id: BjHo
doi: 10.1103/PhysRevLett.110.224502
ec_funded: 1
external_id:
arxiv:
- '1212.0230'
intvolume: ' 110'
issue: '22'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: http://arxiv.org/abs/1212.0230
month: '05'
oa: 1
oa_version: Preprint
project:
- _id: 25152F3A-B435-11E9-9278-68D0E5697425
call_identifier: FP7
grant_number: '306589'
name: Decoding the complexity of turbulence at its origin
publication: Physical Review Letters
publication_status: published
publisher: American Physical Society
publist_id: '3965'
quality_controlled: '1'
scopus_import: 1
status: public
title: Streamwise-localized solutions at the onset of turbulence in pipe flow
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 110
year: '2013'
...