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Article Dans Une Revue Physical Review Letters Année : 1997

Absolute and Convective Secondary Instabilities in Spatially Periodic Shear Flows

Résumé

The generic problem of the spatiotemporal instability of a periodic basic flow (Stuart vortices) is considered in order to interpret the sequence of bifurcations observed in open shear flows. Using a novel numerical technique, we show that the more concentrated the vortices, the smaller the backflow needed to trigger absolute instability. These results allow us to propose an alternative interpretation for the subharmonic resonance observed in forced shear flows, which is classically attributed to an acoustic feedback
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Dates et versions

hal-01731306 , version 1 (14-03-2018)

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Pierre Brancher, Jean-Marc Chomaz. Absolute and Convective Secondary Instabilities in Spatially Periodic Shear Flows. Physical Review Letters, 1997, 78 (4), pp.658-661. ⟨10.1103/PhysRevLett.78.658⟩. ⟨hal-01731306⟩
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