E143 Subharmonic Streak-Instability Modeの成長と乱流への遷移(E-14 遷移と不安定性(4),一般講演)

概要

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Nonlinear development of streak instability modes is examined up to the turbulent stage experimentally through artificially producing spanwise-periodic low-speed streaks in a flat plate laminar boundary layer. The experiment is focused on the subharmonic sinuous-type instability mode. The sinusoidal motion of low-speed streaks caused by the streak instability continues three or four wavelengths downstream beyond the nonlinear saturation stage, and subsequently breaks down into smaller-scale vortices. After the breakdown, near-wall low-speed streaks newly develop and the mean velocity profile starts to exhibit the log-law. It is also found that the interaction between the quasi-streamwise vortices developing along the neighboring streaks causes large-scale arch-like vortices to develop in the region away from the wall.
日本流体力学会の論文
2004-08-09