Abstract

This study examines the Reynolds stress anisotropy tensor based on the turbulence triangle technique and Eigen values in wave-current combined flows. The invariant functions are also presented at four different levels from the bed to comprehend the level of anisotropy in combined flow. The spectral variation of the ratio of principal Reynolds shear stress to the turbulent kinetic energy is examine and discuss in comparison to the canonical value. The combined wave-current data exhibit ratios much smaller than the canonical value of 0.3 across all frequencies. To characterize the behaviours of eddies in wave-current turbulent flow the Taylor and Kolmogorov length and time scales were analysed and discussed. Further, to enumerate degree of organization of complex eddy motions in combined flow the normalized Shannon entropy is also evaluated using discrete probability distribution.

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