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A simple model for low-frequency unsteadiness in shock-induced separation

Abstract : A model to explain the low-frequency unsteadiness found in shock-induced separation is proposed for cases in which the flow is reattaching downstream. It is based on the properties of fluid entrainment in the mixing layer generated downstream of the separation shock whose low-frequency motions are related to successive contractions and dilatations of the separated bubble. The main aerodynamic parameters on which the process depends are presented. This model is consistent with experimental observations obtained by particle image velocimetry (PIV) in a Mach 2.3 oblique shock wave/turbulent boundary layer interaction, as well as with several different configurations reported in the literature for Mach numbers ranging from 0 to 5.
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Contributor : Sébastien Piponniau <>
Submitted on : Friday, February 3, 2017 - 10:17:35 AM
Last modification on : Monday, July 27, 2020 - 1:00:05 PM

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Sébastien Piponniau, Jean-Francois Debiève, Pierre Dupont, Jean-Paul Dussauge. A simple model for low-frequency unsteadiness in shock-induced separation. Journal of Fluid Mechanics, Cambridge University Press (CUP), 2009, 629, pp.87 - 108. ⟨10.1017/S0022112009006417⟩. ⟨hal-01454909⟩



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