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Compressibility effects and turbulence scalings in supersonic channel flow

Published online by Cambridge University Press:  07 June 2004

H. FOYSI ,
S. SARKAR  and
R. FRIEDRICH
H. FOYSI
Affiliation:
Fachgebiet Strömungsmechanik, Technische Universität München, Boltzmannstr. 15, 85748 Garching, Germany
S. SARKAR
Affiliation:
Department of Mechanical and Aerospace Engineering, University of California San Diego, 9500 Gilman Dr., La Jolla, CA 92093-0411, USA
R. FRIEDRICH
Affiliation:
Fachgebiet Strömungsmechanik, Technische Universität München, Boltzmannstr. 15, 85748 Garching, Germany
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Abstract

Turbulence in supersonic channel flow is studied using direct numerical simulation. The ability of outer and inner scalings to collapse profiles of turbulent stresses onto their incompressible counterparts is investigated. Such collapse is adequate with outer scaling when sufficiently far from the wall, but not with inner scaling. Compressibility effects on the turbulent stresses, their anisotropy, and their balance equations are identified. A reduction in the near-wall pressure–strain, found responsible for the changed Reynolds-stress profiles, is explained using a Green's-function-based analysis of the pressure field.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 509 , 25 June 2004 , pp. 207 - 216
Copyright
© 2004 Cambridge University Press

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