Abstract
ABSTRACTNon-equilibrium turbulent flows were considerably investigated in recent years, but most studies are restricted in grid-generated turbulence. In the present contribution we show by large-eddy simulation (LES), that there exists a weakly non-equilibrium turbulence region before the beginning of the full-developed turbulence. Both the dissipation coefficient and the skewness of longitudinal velocity gradient are used as characteristic non-equilibrium quantities, illustrating that the non-equilibrium turbulence region in channel flow is weakly similar to previous studies in grid-generated turbulence. The observation of non-equilibrium turbulence region in transitional channel flow is also expected to inspire future improvement of turbulence models.
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