B112 回密度成層下にある回転一様せん断乱流のDNS(オーガナイズドセッション18 : 環境における乱流熱・物質伝達)

概要

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We have performed the direct numerical simulations (DNS) of a homogeneous shear flow to investigate how the Coriolis term affects the vertically collapsed turbulent structure under strong stable stratification. Rogallo method, i.e., a spectral method, is used for simulating a homogeneous shear flow under system rotation around the x_3 axis. Both the mean temperature gradient and the gravitational acceleration g are simultaneously imposed in the x_3 direction to include the effects of both buoyancy and rotation. The isosurfaces of the vertical vorticities become the scattered pancake-shaped vortex patch, strongly indicating the collapse of turbulence. With an increase in the rotation parameter, the effect of the wind shear becomes more intensive and the pancake structures are elongated in the streamwise direction.
一般社団法人日本機械学会の論文
2001-11-03