A method for determining the frictional velocity in a turbulent channel flow with roughness on the bottom wall

A method for determining the frictional velocity in a turbulent channel flow with roughness on... A method is proposed for determining the frictional velocity U τ on both walls of a fully developed turbulent channel flow, one smooth and the other rough. This should aid experimentalists in obtaining a reliable estimate of U τ with knowledge of only the pressure drop and location where the Reynolds shear stress is zero. The method is general and does not depend on the roughness geometry that is used. It has been validated against direct estimates of the wall stress using DNS databases for two types of two-dimensional roughness. Results for a surface composed of staggered cubes are also in accord with the method. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Experiments in Fluids Springer Journals

A method for determining the frictional velocity in a turbulent channel flow with roughness on the bottom wall

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Publisher
Springer-Verlag
Copyright
Copyright © 2005 by Springer-Verlag
Subject
Engineering
ISSN
0723-4864
eISSN
1432-1114
D.O.I.
10.1007/s00348-005-0975-7
Publisher site
See Article on Publisher Site

Abstract

A method is proposed for determining the frictional velocity U τ on both walls of a fully developed turbulent channel flow, one smooth and the other rough. This should aid experimentalists in obtaining a reliable estimate of U τ with knowledge of only the pressure drop and location where the Reynolds shear stress is zero. The method is general and does not depend on the roughness geometry that is used. It has been validated against direct estimates of the wall stress using DNS databases for two types of two-dimensional roughness. Results for a surface composed of staggered cubes are also in accord with the method.

Journal

Experiments in FluidsSpringer Journals

Published: May 11, 2005

References

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