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Anisotropy of small-scale scalar turbulence

Published online by Cambridge University Press:  26 November 2001

SUSAN KURIEN ,
KONSTANTINOS G. AIVALIS  and
KATEPALLI R. SREENIVASAN
SUSAN KURIEN
Affiliation:
Department of Physics, Yale University, New Haven, CT 06520, USA
KONSTANTINOS G. AIVALIS
Affiliation:
Department of Mechanical Engineering, Yale University, New Haven, CT 06520, USA
KATEPALLI R. SREENIVASAN
Affiliation:
Department of Physics, Yale University, New Haven, CT 06520, USA Department of Mechanical Engineering, Yale University, New Haven, CT 06520, USA
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Abstract

The anisotropy of small-scale temperature fluctuations in shear flows is analysed by making measurements in high-Reynolds-number atmospheric surface layers. A spherical harmonics representation of the moments of scalar increments is proposed, such that the isotropic part corresponds to the index j = 0 and increasing degrees of anisotropy correspond to increasing j. The parity and angular dependence of the odd moments of the scalar increments show that the moments cannot contain any isotropic part (j = 0), but can be satisfactorily represented by the lowest-order anisotropic term corresponding to j = 1. Thus, the skewnesses of scalar increments (and derivatives) are inherently anisotropic quantities, and are not suitable indicators of the tendency towards isotropy.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 448 , 10 December 2001 , pp. 279 - 288
Copyright
© 2001 Cambridge University Press

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