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Article Dans Une Revue Physics of Fluids Année : 2016

Resonances in the forced turbulent wake past a 3D blunt body

Diogo Barros
Jacques Borã©e
  • Fonction : Auteur
Andreas Spohn
  • Fonction : Auteur

Résumé

We study the resonances of a forced turbulent wake past a flat-based bluff body using symmetric and antisymmetric actuation modes. The natural, unforced wake flow exhibits broadband dynamics superimposed on oscillatory motions linked to the reminiscent laminar Bénard-von Kármán instability in the turbulent flow. Harmonic and subharmonic resonances can be controlled by the phase relationship of periodic forcing and are linked to the symmetry properties of vortex shedding. Symmetric forcing leads to a strong subharmonic amplification of vortex shedding in the wake, but no harmonic excitation. The robustness of the subharmonic resonance is confirmed at different Reynolds numbers. Antisymmetric actuation, however, promotes a harmonic resonance with very similar wake and drag features.

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Dates et versions

hal-01856282 , version 1 (10-08-2018)

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  • HAL Id : hal-01856282 , version 1

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Diogo Barros, Jacques Borã©e, Bernd R. Noack, Andreas Spohn. Resonances in the forced turbulent wake past a 3D blunt body. Physics of Fluids, 2016, 28, pp.1-12. ⟨hal-01856282⟩
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