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The response of a turbulent boundary layer to a short length of surface roughness

Published online by Cambridge University Press:  20 April 2006

J. Andreopoulos  and
D. H. Wood
J. Andreopoulos
Affiliation:
Sonderforschungsbereich 80, Universität Karlsruhe, W. Germany
D. H. Wood
Affiliation:
Department of Aeronautics, Imperial College, London, U.K. Present address: Department of Mechanical Engineering, University of Newcastle, N.S.W., Australia.
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Abstract

Extensive measurements were made of the response of a high-Reynolds-number turbulent boundary layer to a short length (about three boundary-layer thicknesses) of surface roughness. The measurements include the mean velocity, all the Reynolds streses as well as all the triple products occurring in the Reynolds-stress transport equations. At the last measurement station, 55 boundary-layer thicknesses from the roughness, the boundary layer still had not relaxed to the universal smooth-wall structure. Comparison of the measurements with a calculation of the flow suggests the major requirement for improving the agreement is a more sophisticated treatment of the turbulent-diffusion process.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 118 , May 1982 , pp. 143 - 164
Copyright
© 1982 Cambridge University Press

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