Compressibility effects in the shear layer over a rectangular cavity

Beresh, Steven J.; Wagner, Justin L.; Casper, Katya M.

doi:10.1017/jfm.2016.540

Compressibility effects in the shear layer over a rectangular cavity

Conference · Wed Oct 26 04:00:00 EDT 2016 · Journal of Fluid Mechanics

DOI:https://doi.org/10.1017/jfm.2016.540· OSTI ID:1338675

Beresh, Steven J. ^[1]; Wagner, Justin L. ^[1]; Casper, Katya M. ^[1]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

we studied the influence of compressibility on the shear layer over a rectangular cavity of variable width 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. Furthermore, 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.

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Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

DOE Contract Number:: AC04-94AL85000

OSTI ID:: 1338675

Report Number(s):: SAND2016-3894C; 638733

Conference Information:: Journal Name: Journal of Fluid Mechanics Journal Volume: 808

Country of Publication:: United States

Language:: English

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