419 citations · 2k across the 43 of their papers we have counts for
28 papers · 1 filter
On the investigation of properties of superfluid He turbulence using a hot-wire signal
P. Diribarne, M. Bon-Mardion, A. Girard +17
We report hot-wire measurements performed in two very different, co- and counter-rotating flows, in normal and superfluid helium at 1.6 K, 2 K, and 2.3 K. As recently reported, the…
Universality and Thermodynamics of Turbulence
Damien Geneste, Hugues Faller, Florian Nguyen +5
We investigate universality of the Eulerian velocity structure functions using velocity fields obtained from the stereoscopic particle image velocimetry (SPIV) technique in experim…
Stochastic chaos in a turbulent swirling flow
Davide Faranda, Yuzuru Sato, Brice Saint-Michel +4
We report the experimental evidence of the existence of a random attractor in a fully developed turbulent swirling flow. By defining a global observable which tracks the asymmetry…
New criteria to detect singularities in experimental incompressible flows
Denis Kuzzay, Ewe-Wei Saw, Fabio J. W. A. Martins +4
We introduce two new singularity detection criteria based on the work of Duchon-Robert (DR) [J. Duchon and R. Robert, Nonlinearity, 13, 249 (2000)], and Eyink [G.L. Eyink, Phys. Re…
Dynamo regimes and transitions in the VKS experiment
M. Berhanu, G. Verhille, J. Boisson +14
The Von K{á}rm{á}n Sodium experiment yields a variety of dynamo regimes, when asymmetry is imparted to the flow by rotating impellers at different speed F1 and F2. We show that as…
A statistical mechanics framework for the large-scale structure of turbulent von K{á}rm{á}n flows
Simon Thalabard, Brice Saint-Michel, Éric Herbert +2
In the present paper, recent experimental results on large scale coherent steady states observed in experimental von K{á}rm{á}n flows are revisited from a statistical mechanics per…
Probing turbulence intermittency via Auto-Regressive Moving-Average models
Davide Faranda, Flavio Maria Emanuele Pons, Berengere Dubrulle +1
We suggest a new approach to probing intermittency corrections to the Kolmogorov law in turbulent flows based on the Auto-Regressive Moving-Average modeling of turbulent time serie…
Influence of Reynolds number and forcing type in a turbulent von Kármán flow
Brice Saint-Michel, Bérengère Dubrulle, Louis Marié +2
We present a detailed study of of a global bifurcation occuring in a turbulent von Kármán swirling flow. In this system, the statistically steady states progressively display hyste…
Robust estimate of dynamo thresholds in the von Kármán sodium experiment using the Extreme Value Theory
Davide Faranda, Mickael Bourgoin, Sophie Miralles +5
We apply a new threshold detection method based on the extreme value theory to the von Kármán sodium (VKS) experiment data. The VKS experiment is a successful attempt to get a dyna…
Probing quantum and classical turbulence analogy through global bifurcations in a von Kármán liquid Helium experiment
B Saint-Michel, E Herbert, J Salort +15
We report measurements of the dissipation in the Superfluid Helium high REynold number von Karman flow (SHREK) experiment for different forcing conditions, through a regime of glob…
Eckhaus-like instability of large scale coherent structures in a fully turbulent von Kármán flow
Eric Herbert, Pierre-Philippe Cortet, François Daviaud +1
The notion of instability of a turbulent flow is introduced in the case of a von Kármán flow thanks to the monitoring of the spatio-temporal spectrum of the velocity fluctuations,…
Dual local and non-local cascades in 3D turbulent Beltrami flows
E. Herbert, F. Daviaud, B. Dubrulle +2
We discuss the possibility of dual local and non-local cascades in a 3D turbulent Beltrami flow, with inverse energy cascade and direct helicity cascade, by analogy with 2D turbule…
Turbulent velocity spectra in superfluid flows
J. Salort, C. Baudet, B. Castaing +12
We present velocity spectra measured in three cryogenic liquid 4He steady flows: grid and wake flows in a pressurized wind tunnel capable of achieving mean velocities up to 5 m/s a…
Kinematic dynamo simulations of von Kármán flows: application to the VKS experiment
A. Pinter, B. Dubrulle, F. Daviaud +1
The VKS experiment has evidenced dynamo action in a highly turbulent liquid sodium von Kármán flow [R. Monchaux et al., Phys. Rev. Lett. {\bf 98}, 044502 (2007)]. However, the exis…
Stability and turbulent transport in rotating shear flows: prescription from analysis of cylindrical and plane Couette flows data
B. Dubrulle, O. Dauchot, F. Daviaud +3
This paper provides a prescription for the turbulent viscosity in rotating shear flows for use e.g. in geophysical and astrophysical contexts. This prescription is the result of th…
Characterization of turbulence in inhomogeneous anisotropic flows
Pierre-Philippe Cortet, Pantxo Diribarne, Romain Monchaux +3
We introduce a global quantity that characterizes turbulent fluctuations in inhomogeneous anisotropic flows. This time-dependent quantity is based on spatial averages of global…
Fluctuation-Dissipation Relations and statistical temperatures in a turbulent von Kármán flow
Romain Monchaux, Pierre-Philippe Cortet, Pierre-Henri Chavanis +4
We experimentally characterize the fluctuations of the non-homogeneous non-isotropic turbulence in an axisymmetric von Kármán flow. We show that these fluctuations satisfy relation…
Supercritical transition to turbulence in an inertially-driven von Karman closed flow
Florent Ravelet, Arnaud Chiffaudel, Francois Daviaud
We study the transition from laminar flow to fully developed turbulence for an inertially-driven von Karman flow between two counter-rotating large impellers fitted with curved bla…
Subcritical dynamo bifurcation in the Taylor Green flow
Yannick Ponty, Jean-Phillipe Laval, Berengere Dubrulle +2
We report direct numerical simulations of dynamo generation for flow generated using a Taylor-Green forcing. We find that the bifurcation is subcritical, and show its bifurcation d…
Magnetic induction in a turbulent flow of liquid sodium: mean behaviour and slow fluctuations
F. Ravelet, R. Volk, A. Chiffaudel +10
We study the flow response to an externally imposed homogeneous magnetic field in a turbulent swirling flow of liquid sodium -- the VKS2 experiment in which magnetic Reynolds numbe…
Magnetic field reversals in an experimental turbulent dynamo
M. Berhanu, R. Monchaux, S. Fauve +11
We report the first experimental observation of reversals of a dynamo field generated in a laboratory experiment based on a turbulent flow of liquid sodium. The magnetic field rand…
Generation of magnetic field by dynamo action in a turbulent flow of liquid sodium
R. Monchaux, M. Berhanu, M. Bourgoin +13
We report the observation of dynamo action in the VKS experiment, i.e., the generation of magnetic field by a strongly turbulent swirling flow of liquid sodium. Both mean and fluct…
Transport of magnetic field by a turbulent flow of liquid sodium
R. Volk, F. Ravelet, R. Monchaux +8
We study the effect of a turbulent flow of liquid sodium generated in the von Kármán geometry, on the localized field of a magnet placed close to the frontier of the flow. We obser…
Influence of turbulence on the dynamo threshold
Jean-Philippe Laval, Pierre Blaineau, Nicolas Leprovost +2
We use direct and stochastic numerical simulations of the magnetohydrodynamic equations to explore the influence of turbulence on the dynamo threshold. In the spirit of the Kraichn…