FN Archimer Export Format
PT J
TI Influence of Reynolds number and forcing type in a turbulent von Karman flow
BT 
AF SAINT-MICHEL, Brice
   DUBRULLE, B.
   MARIE, Louis
   RAVELET, F.
   DAVIAUD, F.
AS 1:1;2:1;3:2;4:3;5:1;
FF 1:;2:;3:PDG-ODE-LPO;4:;5:;
C1 CEA Saclay, CNRS URA 2464, DSM, Lab SPHYNX,Serv Phys Etat Condense, F-91191 Gif Sur Yvette, France.
   UMR 6523 CNRS IFREMER IRD UBO, Lab Phys Oceans, Brest, France.
   ENSAM ParisTech, CNRS EA92, Lab Dynfluid, F-75013 Paris, France.
C2 CEA, FRANCE
   IFREMER, FRANCE
   ENSAM, FRANCE
SI BREST
SE PDG-ODE-LPO
IN WOS Ifremer jusqu'en 2018
   copubli-france
IF 3.558
TC 2
UR https://archimer.ifremer.fr/doc/00204/31503/29904.pdf
LA English
DT Article
DE ;turbulence;instability;negative response;symmetry
AB We present a detailed study of a global bifurcation occuring in a turbulent von Karman swirling flow. In this system, the statistically steady states progressively display hysteretic behaviour when the Reynolds number is increased above the transition to turbulence. We examine in detail this hysteresis using asymmetric forcing conditions-rotating the impellers at different speeds. For very high Reynolds numbers, we study the sensitivity of the hysteresis cycle-using complementary particle image velocimetry and global mechanical measurements-to the forcing nature, imposing either the torque or the speed of the impellers. New mean states, displaying multiple quasi-steady states and negative differential responses, are experimentally observed in torque control. A simple analogy with electrical circuits is performed to understand the link between multi-stability and negative responses. The system is compared to other, similar 'bulk' systems, to understand some relevant ingredients of negative differential responses, and studied in the framework of thermodynamics of long-range interacting systems. The experimental results are eventually compared to the related problem of Rayleigh-Benard turbulence.
PY 2014
PD JUL
SO New Journal Of Physics
SN 1367-2630
PU Iop Publishing Ltd
VL 16
IS 063037
UT 000339080200002
BP 1
EP 27
DI 10.1088/1367-2630/16/6/063037
ID 31503
ER

EF