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Unsteady behaviour of separated and reattaching flows for a backward-facing step configuration at high Reynolds numbers

Abstract : A contribution to the study of unsteady behavior of separated and reattaching flows over a backwardfacing is reported. Unsteady wall pressure and velocity field measurements were done in order to clarify the main Reynolds number dependencies with regards to downstream external parameters. The recirculation length and the secondary separation point, as well as the statistics of the velocity fields and the surface pressure, are analyzed and compared to previous studies. Main flow characteristics were investigated for seven Reynolds numbers ranged from 31500 to 182600. Unsteady pressure spectra analysis indicated that in the region close to the separation point, even for high Reynolds number, the low frequency flapping motion is relatively dominant over the high frequency mode of the large scale vortical structure. The ability to understand the flow field unsteadiness can lead to the development of active and/or passive flow control techniques. Current works are being done searching for active control laws strategies to control these instabilities.
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https://hal-uphf.archives-ouvertes.fr/hal-03442143
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Submitted on : Tuesday, November 23, 2021 - 8:14:57 AM
Last modification on : Wednesday, November 24, 2021 - 3:48:27 AM

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  • HAL Id : hal-03442143, version 1

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Camila Chovet, Laurent Keirsbulck, Marc Lippert, Jean-Marc Foucaut. Unsteady behaviour of separated and reattaching flows for a backward-facing step configuration at high Reynolds numbers. 23ème Congrès Français de Mécanique, Aug 2017, Lille, France. ⟨hal-03442143⟩

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