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A structural turbulence model for triple products of velocity and scalar

Published online by Cambridge University Press:  26 April 2006

Y. Nagano  and
M. Tagawa
Y. Nagano
Affiliation:
Department of Mechanical Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466, Japan
M. Tagawa
Affiliation:
Department of Mechanical Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466, Japan
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Abstract

The statistical characteristics of third-order moments (triple products) of velocity and scalar have been investigated from both experimental and theoretical points of view. The third-order moments have a highly intermittent nature and are dominated by coherent motions in shear-generated turbulence. Using a previously developed statistical method (Nagano & Tagawa 1988), the similarity between the Reynolds stress and scalar flux transport was analysed. On the basis of the experimental results, we have developed an entirely new approach to the modelling of triple products, and constructed a ‘structural’ turbulence model for triple velocity and scalar products. This model has a simple form and universal applicability, and its effectiveness has been tested by application to various types of flow.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 215 , June 1990 , pp. 639 - 657
Copyright
© 1990 Cambridge University Press

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