低レイノルズ数チャネル乱流におけるパフ構造の解析(乱流の予測とモデリング(1),一般講演)

概要

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The direct numerical simulations with the spectral method are performed to study a puff structure of turbulent channel flow at the very low Reynolds number. Similar turbulent puff to that in turbulent pipe flow is observed in Poiseuille flow. The puff is inclined about an angle of 25° with respect to the streamwise direction. The spanwise velocity is found to spread from the puff over the channel center. We also investigate the effects of puff on the turbulence statistics averaged over the small regions which can not contain both the quasi-laminar state and puff, simultaneously. As a result, it is found that the puff contributes significantly to splatting and rms value of streamwise vorticity, which are negligibly small outside of the puff, or in the quasi-laminar state.
日本流体力学会の論文
2007-08-06