曲がりチャネル内乱流の空間発展DNS : Re_<τ0>=300の場合(乱流(4),一般講演)

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  • Spatially Advancing DNS of Curved Channel Turbulent Flow : Re_<τ0>=300

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Direct numerical simulation was performed for a spatially advancing turbulent flow in a two-dimensional curved channel. The radius ratio of the curved part, α, was set at 0.92, the same as Kobayashi et al.'s experiment. However, the friction Reynolds number, Re_<τ0>, was assigned at 300, which was roughly half the experiment. Numerically solved mean velocity showed trends consistent with the experiment in spite of the Reynolds number difference. Numerical data of mean velocity field illustrated that large scale vortices grew along curved channel. Instantaneous flow field and power spectrum analysis implied that micro structures near the outer wall were related to the birth and formation of large scale vortices.

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