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Locally axisymmetric turbulence

Published online by Cambridge University Press:  26 April 2006

William K. George  and
Hussein J. Hussein
William K. George
Affiliation:
State University of New York at Buffalo, Buffalo, NY 14260, USA
Hussein J. Hussein
Affiliation:
Vanderbilt University, Nashville, TN 37235, USA
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Abstract

The failure of local isotropy to describe the experimentally obtained derivative moments in turbulent shear flows has previously been well-documented, but is briefly reviewed. The same data are then used to evaluate the hypothesis that the turbulence is locally axisymmetric. Locally axisymmetric turbulence is defined herein as turbulence which is locally invariant to rotations about a preferred axis.

The derivative moment relations are derived from the general form of the two-point velocity correlation tensor near the origin for axisymmetric turbulence. These are used to derive relations for the rate of dissipation of kinetic energy, the mean-square vorticity, and the components of each. Almost all of the experimental derivative moment data are shown to be consistent with these equations, and thus with local axisymmetry.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 233 , December 1991 , pp. 1 - 23
Copyright
© 1991 Cambridge University Press

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