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High-order moments of Reynolds shear stress fluctuations in a turbulent boundary layer

Published online by Cambridge University Press:  29 March 2006

R. A. Antonia  and
J. D. Atkinson
R. A. Antonia
Affiliation:
Department of Mechanical Engineering, University of Sydney
J. D. Atkinson
Affiliation:
Department of Mechanical Engineering, University of Sydney
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Abstract

The cumulant-discard approach is used to predict the third- and fourth-order moments and the probability density of turbulent Reynolds shear stress fluctuations uv, the streamwise and normal velocity fluctuations being represented by u and v respectively. Measurements of these quantities in a turbulent boundary layer are presented, with the required statistics of uv obtained by the use of a high-speed digital data-acquisition system. Including correlations between u and u up to the fourth order, the cumulant-discard predictions are in close agreement with the measurements in the inner region of the layer but only qualitatively follow the experimental results in the outer intermittent region. In this latter region, predictions for the third- and fourth-order moments of uv are also obtained by assuming that the properties of both turbulent and irrotational fluctuations are Gaussian and by using some of the available conditional averages of u, v and uv.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 58 , Issue 3 , 8 May 1973 , pp. 581 - 593
Copyright
© 1973 Cambridge University Press

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