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Ninth International Symposium on Turbulence and Shear Flow Phenomena
June 30 - July 3, 2015, University of Melbourne, Australia

DOI: 10.1615/TSFP9

COMPRESSIBILITY EFFECTS ON TURBULENT SHEAR FLOWS

pages 371-380
DOI: 10.1615/TSFP9.630
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RÉSUMÉ

Compressibility effects are present in many practical turbulent flows, ranging from shock-wave/boundary-layer interactions on the wings of aircraft operating in the transonic flight regime to supersonic and hypersonic engine intake flows. Besides shock wave interactions, compressible flows have additional dilatational effects and, due to the finite sound speed, pressure fluctuations are localized and modified relative to incompressible turbulent flows. Such changes can be highly significant, for example the growth rates of mixing layers and turbulent spots are reduced by factors of more than three at high Mach number. In this paper we review some of the basic effects of compressibility on canonical turbulent flows and attempt to rationalise the different effects of Mach number in different flows using a flow instability concept. We then turn our attention to a fully three-dimensional problem of shock-wave/boundarylayer interaction in a closed duct, considering direct effects of shock waves, due to their penetration into the outer part of the boundary layer, as well as indirect effects due to the high convective Mach number of the shock-induced separation zone. It is noted in particular how shock-induced turning of the detached shear layer results in strong localized damping of turbulence kinetic energy.

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