0215 低レイノルズ数ポアズイユ乱流に対するスパン方向剛体回転の影響(OS2-3 乱流の計測・解析・制御,オーガナイズドセッション)

概要

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The direct numerical simulation (DNSs) with a spectral method are performed to study the effects of spanwise rotation on a turbulent Poiseuille flow at very low-Reynolds numbers. At the small rotation and Reynolds numbers, the region of the zero absolute vorticity, typically observed in the mean velocity profile of a rotating Poiseuille flow, disappears in the channel center, and the mean velocity gradient becomes opposite to that of zero absolute vorticity. When it disappears, very long low-speed streaks coiled by twisted vortical structures, dominate the flow, where low-speed fluids near a wall are excessively pumped up, and trapped into the channel center by the larger-scale twisted vortices away from the wall.
2009-11-06