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RESEARCH PAPERS

Anisotropy Invariants of Reynolds Stress Tensor in a Duct Flow and Turbulent Boundary Layer

[+] Author and Article Information
A. Mazouz, L. Labraga, C. Tournier

Laboratoire de Mécanique des Fluides, L.A.M.I.H., Université de Valenciennes et du Hainaut Cambrésis, le Mont Houy, B.P. 311, 59304 Valenciennes Cedex, France

J. Fluids Eng 120(2), 280-284 (Jun 01, 1998) (5 pages) doi:10.1115/1.2820645 History: Received July 08, 1996; Revised December 04, 1997; Online December 04, 2007

Abstract

The present study shows that the Reynolds stress anisotropy tensor for turbulent flow depends both on the nature of the surface and the boundary conditions of the flow. Contrary to the case of turbulent boundary layers with k-type surface roughness, the measured anisotropy invariants of the Reynolds stress tensor over a series of spanwise square bars separated by rectangular cavities (k-type) in duct flows show that roughness increases the anisotropy. There is a similarity between the effect of roughness on channel flow turbulence and that on pipe flow turbulence. The present data show that the effect of introducing a surface roughness significantly perturbs the entire thickness of the turbulent flow.

Copyright © 1998 by The American Society of Mechanical Engineers
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