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Statistical characteristics of wall turbulence with a passive scalar

Published online by Cambridge University Press:  21 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

Various types of moments of velocity and scalar fluctuations of the first to the fourth order have been measured and analysed. First, an orthogonal series expansion for the three-dimensional joint probability density function (p.d.f.) is developed using the cumulants and Hermite polynomials. This p.d.f. is found to provide satisfactory predictions for the statistical characteristics, including triple products, of turbulent momentum and scalar transfer. Next, the conditional sampling and averaging technique is employed to investigate the statistical characteristics of coherent turbulent transfer processes of momentum and scalar. Conditional p.d.f.s are developed for various moments of velocity and scalar up to the third order. It is shown that the present p.d.f.s can predict the detailed role of coherent motions in the dynamics of wall turbulent shear flows and in the relevant process of scalar transport by turbulence. In particular, the importance of coherent motions in the turbulent diffusion process of Reynolds-stress components and scalar fluxes is demonstrated for the first time by the present theory.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 196 , November 1988 , pp. 157 - 185
Copyright
© 1988 Cambridge University Press

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