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

Published online by Cambridge University Press:  15 June 2009

S. PIPONNIAU ,
J. P. DUSSAUGE ,
J. F. DEBIÈVE  and
P. DUPONT
S. PIPONNIAU
Affiliation:
Institut Universitaire des Systèmes Thermiques IndustrielsUniversité de Provence and UMR CNRS 6595, Marseille 13013, France
J. P. DUSSAUGE
Affiliation:
Institut Universitaire des Systèmes Thermiques IndustrielsUniversité de Provence and UMR CNRS 6595, Marseille 13013, France
J. F. DEBIÈVE
Affiliation:
Institut Universitaire des Systèmes Thermiques IndustrielsUniversité de Provence and UMR CNRS 6595, Marseille 13013, France
P. DUPONT*
Affiliation:
Institut Universitaire des Systèmes Thermiques IndustrielsUniversité de Provence and UMR CNRS 6595, Marseille 13013, France
*
†Email address for correspondence: pierre.dupont@polytech.univ-mrs.fr
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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.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 629 , 25 June 2009 , pp. 87 - 108
Copyright
Copyright © Cambridge University Press 2009

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References

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