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A turbulent-transport model for concentration fluctuations and fluxes

Published online by Cambridge University Press:  20 April 2006

R. I. Sykes ,
W. S. Lewellen  and
S. F. Parker
R. I. Sykes
Affiliation:
Aeronautical Research Associates of Princeton, Inc., 50 Washington Road, P.O. Box 2229, Princeton, New Jersey 08540
W. S. Lewellen
Affiliation:
Aeronautical Research Associates of Princeton, Inc., 50 Washington Road, P.O. Box 2229, Princeton, New Jersey 08540
S. F. Parker
Affiliation:
Aeronautical Research Associates of Princeton, Inc., 50 Washington Road, P.O. Box 2229, Princeton, New Jersey 08540
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Abstract

A second-order closure model describing the diffusion of a passive scalar from a small source is presented. The model improves upon the earlier work of Lewellen & Teske (1976) by ensuring the early stage of the release, the so-called meander phase, is accurately described. In addition to the mean concentration and scalar fluxes, a model equation for the evolution of the scalar variance is proposed. The latter introduces a new lengthscale which represents the scale of the concentration fluctuations. The model predictions are compared with the recent experimental data of Fackrell & Robins (1982a, b).

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 139 , February 1984 , pp. 193 - 218
Copyright
© 1984 Cambridge University Press

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