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Instabilities in oblique shock wave/laminar boundary-layer interactions

Published online by Cambridge University Press:  15 January 2016

F. Guiho ,
F. Alizard  and
J.-Ch. Robinet
F. Guiho
Affiliation:
DynFluid Lab., Arts and Métiers ParisTech, 151, Bd. de l’Hôpital, 75013, Paris, France CNES, Direction des lanceurs, 52, rue Jacques Hillairet, 75012, Paris, France
F. Alizard
Affiliation:
DynFluid Lab., CNAM, 151, Bd. de l’Hôpital, 75013, Paris, France
J.-Ch. Robinet*
Affiliation:
DynFluid Lab., Arts and Métiers ParisTech, 151, Bd. de l’Hôpital, 75013, Paris, France
*
†Email address for correspondence: Jean-Christophe.Robinet@ensam.eu
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Abstract

The interaction of an oblique shock wave and a laminar boundary layer developing over a flat plate is investigated by means of numerical simulation and global linear-stability analysis. Under the selected flow conditions (free-stream Mach numbers, Reynolds numbers and shock-wave angles), the incoming boundary layer undergoes separation due to the adverse pressure gradient. For a wide range of flow parameters, the oblique shock wave/boundary-layer interaction (OSWBLI) is seen to be globally stable. We show that the onset of two-dimensional large-scale structures is generated by selective noise amplification that is described for each frequency, in a linear framework, by wave-packet trains composed of several global modes. A detailed analysis of both the eigenspectrum and eigenfunctions gives some insight into the relationship between spatial scales (shape and localization) and frequencies. In particular, OSWBLI exhibits a universal behaviour. The lowest frequencies correspond to structures mainly located near the separated shock that emit radiation in the form of Mach waves and are scaled by the interaction length. The medium frequencies are associated with structures mainly localized in the shear layer and are scaled by the displacement thickness at the impact. The linear process by which OSWBLI selects frequencies is analysed by means of the global resolvent. It shows that unsteadiness are mainly associated with instabilities arising from the shear layer. For the lower frequency range, there is no particular selectivity in a linear framework. Two-dimensional numerical simulations show that the linear behaviour is modified for moderate forcing amplitudes by nonlinear mechanisms leading to a significant amplification of low frequencies. Finally, based on the present results, we draw some hypotheses concerning the onset of unsteadiness observed in shock wave/turbulent boundary-layer interactions.

JFM classification

Compressible Flows: Compressible boundary layers Instability: Instability Wakes/Jets: Separated flows
Type
Papers
Information
Journal of Fluid Mechanics , Volume 789 , 25 February 2016 , pp. 1 - 35
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© 2016 Cambridge University Press 

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