Abstract
The characteristics of intermittent turbulence induced by wall surface roughness in a finite Stokes layer were investigated numerically, including the velocity gradient at the wall, the velocity profile and the Reynolds stress, etc.， with a transitional Reynolds number Re=495.The results show that, the velocity profile does not follow the logarithmic law in most phases, but does only in some rare phases during the decelerating stage. The comparison between the Reynolds stress and the result in the case of the incompressible boundary layer indicates that, the Reynolds stress distribution in the turbulence stage is similar to that in the case of the incompressible boundary layer, including the peak amplitude and the peak position, but there is significant discrepancy in the turbulence core region between the 2 cases. Above characteristics reveal the strong nonequilibrium behaviors of intermittent turbulence in the Stokes layer.
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