HAL : hal-00002925, version 1

arXiv : physics/0409113

DOI : 10.1103/PhysRevLett.93.164501

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Physical Review Letters 93 (2004) 164501

Multistability and memory effect in a highly turbulent flow: experimental evidence for a global bifurcation

Florent Ravelet 1, Louis Marié 1, Arnaud Chiffaudel 1, François Daviaud 1

(15/10/2004)

We report an experimental evidence of a global bifurcation on a highly turbulent von Karman flow. The mean flow presents multiple solutions: the canonical symmetric solution becomes marginally unstable towards a flow which breaks the basic symmetry of the driving apparatus even at very large Reynolds number. The global bifurcation between these states is highly subcritical and the system thus keeps a memory of its history. The transition recalls low-dimension dynamical systems transitions and exhibits a very peculiar statistics. We discuss the role of turbulence in two ways: the multiplicity of hydrodynamical solutions and the effect of fluctuations on the nature of transitions.

1 :	Service de physique de l'état condensé (SPEC)
	CNRS : URA2464 – CEA : DSM/IRAMIS

Domaine

:

Physique/Physique/Dynamique des Fluides

Mots Clés : global bifurcation – turbulence – transition statistics – subcritical – hysteresis – turbulent von Karman flow

hal-00002925, version 1

http://hal.archives-ouvertes.fr/hal-00002925/fr/

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Contributeur : Florent Ravelet <>

Soumis le : Mardi 21 Septembre 2004, 17:25:20

Dernière modification le : Mardi 10 Juillet 2007, 10:14:36