Measurements in a Turbulent Boundary Layer Over a d-Type Surface Roughness

[+] Author and Article Information
D. H. Wood, R. A. Antonia

Department of Mechanical Engineering, The University of Sydney, Sydney, Australia

J. Appl. Mech 42(3), 591-597 (Sep 01, 1975) (7 pages) doi:10.1115/1.3423647 History: Received August 01, 1974; Revised February 01, 1975; Online July 12, 2010


Mean velocity and turbulence intensity measurements have been made in a fully developed turbulent boundary layer over a d-type surface roughness. This roughness is characterised by regular two-dimensional elements of square cross section placed one element width apart, with the cavity flow between elements being essentially isolated from the outer flow. The measurements show that this boundary layer closely satisfies the requirement of exact self-preservation. Distribution across the layer of Reynolds normal and shear stresses are closely similar to those found over a smooth surface except for the region immediately above the grooves. This similarity extends to distributions of third and fourth-order moments of longitudinal and normal velocity fluctuations and also to the distribution of turbulent energy dissipation. The present results are compared with those obtained for a k-type or sand grained roughness.

Copyright © 1975 by ASME
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