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Compressibility effects in the shear layer over a rectangular cavity

Published online by Cambridge University Press:  26 October 2016

Steven J. Beresh ,
Justin L. Wagner  and
Katya M. Casper
Steven J. Beresh*
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185, USA
Justin L. Wagner
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185, USA
Katya M. Casper
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185, USA
*
†Email address for correspondence: sjberes@sandia.gov
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Abstract

The influence of compressibility on the shear layer over a rectangular cavity of variable width has been studied in a free stream Mach number range of 0.6–2.5 using particle image velocimetry data in the streamwise centre plane. As the Mach number increases, the vertical component of the turbulence intensity diminishes modestly in the widest cavity, but the two narrower cavities show a more substantial drop in all three components as well as the turbulent shear stress. This contrasts with canonical free shear layers, which show significant reductions in only the vertical component and the turbulent shear stress due to compressibility. The vorticity thickness of the cavity shear layer grows rapidly as it initially develops, then transitions to a slower growth rate once its instability saturates. When normalized by their estimated incompressible values, the growth rates prior to saturation display the classic compressibility effect of suppression as the convective Mach number rises, in excellent agreement with comparable free shear layer data. The specific trend of the reduction in growth rate due to compressibility is modified by the cavity width.

JFM classification

Turbulent Flows: Compressible turbulence Aerodynamics: High-speed flow Turbulent Flows: Shear layer turbulence
Type
Papers
Information
Journal of Fluid Mechanics , Volume 808 , 10 December 2016 , pp. 116 - 152
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© Cambridge University Press 2016. This is a work of the U.S. Government and is not subject to copyright protection in the United States. 

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