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Characterization of the shear layer in separated shock/turbulent boundary layer interactions

Published online by Cambridge University Press:  05 February 2021

Clara M. Helm Open the ORCID record for Clara M. Helm [Opens in a new window] ,
M. Pino Martín Open the ORCID record for M. Pino Martín [Opens in a new window]  and
Owen J.H. Williams Open the ORCID record for Owen J.H. Williams [Opens in a new window]
Clara M. Helm
Affiliation:
Department of Aerospace Engineering, University of Maryland, College Park, MD 20742, USA
M. Pino Martín*
Affiliation:
Department of Aerospace Engineering, University of Maryland, College Park, MD 20742, USA
Owen J.H. Williams
Affiliation:
William E. Boeing Department of Aeronautics and Astronautics, University of Washington, Seattle, WA 98195, USA
*
†Email address for correspondence: mpmartin@umd.edu
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Abstract

A thorough characterization of the shear layer that exists in large eddy simulation data of three separated, compression ramp-generated shock/turbulent boundary layer interactions is presented. Free stream Mach numbers ahead of the separation shock are 2.9, 7.2 and 9.1. The shear layers produced by the separation in these flows have convective Mach numbers of 1.0, 1.9 and 2.0, respectively. It is found that the separation shear layers share many properties associated with canonical compressible mixing layers. A region of approximate similarity is found in each where it is possible to collapse the mean flow profiles into nearly a single similarity profile. Large mixing-layer-like vortical rollers are found in the shear layers and these are shown to become increasingly three-dimensional with increasing convective Mach number. The relation between the peak turbulence stress and the spreading rate was found to be consistent with mixing layer data and mixing layer theory derived from dimensional analysis. Turbulent kinetic energy and Reynolds stress budget analysis revealed that, although the streamwise turbulence production is greater than the canonical mixing layer, the transfer of turbulence energy by the pressure–strain terms and the energy drain by viscosity terms both show similar behaviour to mixing layer data at matching convective Mach number. As a result, the spreading rate and turbulence anisotropy decrease with increasing $M_c$. These conclusions are aided by an accurate and direct measurement of the vortex convection velocity determined from enhanced two-point correlations in the shear flow. The usefulness of studying the shock/turbulent boundary layer flow in this manner is emphasized.

JFM classification

Turbulent Flows: Compressible turbulence Turbulent Flows: Shear layer turbulence Compressible Flows: Shock waves

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JFM Papers
Information
Journal of Fluid Mechanics , Volume 912 , 10 April 2021 , A7
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© The Author(s), 2021. Published by Cambridge University Press

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