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Anisotropy of small-scale scalar turbulence
Journal of Fluid Mechanics
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 isotropicdoi:10.1017/s0022112001006176 fatcat:xrx4xofdyrgrzlrikcb7i4r22i