AM05-12-016 一様せん断乱流の縦渦構造に対するスパン方向剛体回転の影響(乱流渦構造4,一般講演)

概要

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Direct numerical simulations of a homogeneous shear flow under both cyclonic and anticyclonic system rotation are performed to study the effects of the system rotation on the longitudinal vortical structure. It was found that in both cyclonic and anticyclonic cases, the system rotation reduces the effects of the nonlinear term, though the turbulent Reynolds number increases with time in the anticyclonic case. As the result, the tilting of the vortical structure into the spanwise direction almost disappears, and the axis of the longitudinal vortex becomes parallel to the streamwise direction. Moreover, the tilting is found to be associated with the vortex stretching in the spanwise direction, and the asymmetric distribution of the Reynolds shear stress around the vortical structures.
2005-09-05