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Abstract
The aim of this study to clarify the 3-dimensional coherent structure in turbulent shear flows and the effect of a streamwise vortical structure on the turbulent mixing. To achieve this purpose, large eddy simulation of a turbulent shear flow with a passive scalar mixing was conducted. As an initial value, a 3-dimensional small perturbation was overlapped on the mean velocity profile. From the calculated results, the following conclusions are obtained. (1) The 3-dimensional perturbation develops into a streamwise counter rotating vortex pair. (2) The growth rate of the 3-dimensional instability is slower than that of the 2-dimensional instability. (3) The growth rate is maximum when the spanwise wavelength of the 3-dimensional perturbation is two thirds of the streamwise wavelength of the fundamental wave.
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