0142 回転系振動格子乱流のDNS(OS1-8 噴流,後流および剥離流れの流動解析と応用,オーガナイズドセッション)

概要

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Recently, the secondary conservative finite difference scheme for the flow on moving grid has been proposed. In this study, we have carried out the direct numerical simulation (DNS) of oscillating grid turbulence subjected to system rotation using the scheme. Then, the effect of system rotation on the turbulent flow is considered with the DNS data. The present numerical simulation reproduced corresponding experimental observations for the flows with and without system rotation. The distribution of kinetic energy showed that the rotation inhibits the decay of kinetic energy in the region away from the oscillating grid. In the system without rotation, the turbulence intensity in the vertical direction produced by the oscillating grid becomes dominant in the region away from the grid, and the turbulence is anisotropic. On the other hand, the anisotropy is inhibited in the system with rotation.
2009-11-06