A Note on a Generalized Eddy-Viscosity Hypothesis

[+] Author and Article Information
P. Andreasson, U. Svensson

Water Resources Engineering, Luleå University of Technology, Luleå, Sweden

J. Fluids Eng 114(3), 463-466 (Sep 01, 1992) (4 pages) doi:10.1115/1.2910055 History: Received October 31, 1991; Online May 23, 2008


The standard eddy-viscosity concept postulates that zero velocity gradient is accompanied by zero shear stress. This is not true for many boundary layer flows: wall jets, asymmetric channel flows, countercurrent flows, for example. The generalized eddy-viscosity hypothesis presented in this paper, relaxes this limitation by recognizing the influence of gradients in the turbulent length scale and the shear. With this new eddy-viscosity concept, implemented into the standard k–ε model, predictions of some boundary layer flows are made. The modelling results agree well with measurements, where predictions with the standard eddy-viscosity concept are known to fail.

Copyright © 1992 by The American Society of Mechanical Engineers
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