Reflectional symmetry breaking of the separated flow over three-dimensional bluff bodies

Mathieu Grandemange 1 Olivier Cadot 1 Marc Gohlke 2
1 DFA - Dynamique des Fluides et Acoustique
2 Department of Research and Innovation
Abstract : Experimental observation of a permanent reflectional symmetry breaking (RSB) is reported for a laminar three-dimensional wake. Based on flow visualizations, a first bifurcation from the trivial steady symmetric state to a steady RSB state is characterized at Re=340. The RSB state becomes unsteady after a second bifurcation at Re=410. It is found that this RSB regime is persistent at large Reynolds numbers and is responsible for a bistable turbulent wake.
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Mathieu Grandemange, Olivier Cadot, Marc Gohlke. Reflectional symmetry breaking of the separated flow over three-dimensional bluff bodies. Physical Review E : Statistical, Nonlinear, and Soft Matter Physics, American Physical Society, 2012, 86 (3), pp.035302. ⟨10.1103/physreve.86.035302⟩. ⟨hal-00838864⟩

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