不稳定性
雷诺数
无粘流
机械
物理
圆柱
涡流
弗洛奎特理论
流量(数学)
湍流
旋涡脱落
层流
几何学
数学
非线性系统
量子力学
作者
Alessandro Chiarini,Maurizio Quadrio,Franco Auteri
摘要
The three-dimensional instability of the flow past a 5 : 1 rectangular cylinder is investigated via Floquet analysis and direct numerical simulations. A quasi-subharmonic (QS) unstable mode is detected, marking an important difference with the flow past bodies with lower aspect ratio and/or with smooth leading edge. The QS mode becomes unstable at Reynolds number (based on the cylinder thickness and free-stream velocity) $Re \approx 480$ ; its spanwise wavelength is approximately three times the cylinder thickness. The structural sensitivity locates the wavemaker region over the longitudinal sides of the cylinder, indicating that the instability is triggered by the mutual inviscid interaction of vortices generated by the leading edge shear layer.
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