Oscillating-grid induced turbulence in confined geometries (tanks) is commonly used in the study of turbulence with zero-mean shear. It is demonstrated that the mean secondary circulation generated during such experiments can be reduced by selecting conditions that lessen the Reynolds-stress gradients within the fluid. A simple power law for the spatial decay of turbulent velocity fluctuations is realized only in the absence of such mean circulation.
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Fernando et al. (1993) studied this question.
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