Multistability and memory effect in a highly turbulent flow: experimental evidence for a global bifurcation - Archive ouverte HAL Access content directly
Journal Articles Physical Review Letters Year : 2004

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

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1

Abstract

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.
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Dates and versions

hal-00002925 , version 1 (21-09-2004)

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Florent Ravelet, Louis Marié, Arnaud Chiffaudel, François Daviaud. Multistability and memory effect in a highly turbulent flow: experimental evidence for a global bifurcation. Physical Review Letters, 2004, 93, pp.164501. ⟨10.1103/PhysRevLett.93.164501⟩. ⟨hal-00002925⟩
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