Laminar flow past a rotating circular cylinder
Laminar flow past a rotating circular cylinder
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DOI：
10.1063/1.870190
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发表时间：
1999-10
影响因子：
4.6
通讯作者：
Sangmo Kang;Haecheon Choi;Sangsan Lee
中科院分区：
文献类型：
--
作者：
Sangmo Kang;Haecheon Choi;Sangsan Lee
本文数值研究了二维层流绕流圆柱体的定常角速度旋转，目的是控制旋涡脱落和了解潜在的流动机制。对Re = 60、100和160的流动进行了数值模拟，范围为0 <$α <$2.5，其中α是由自由流速度归一化的圆柱表面的周向速度。结果表明，圆柱的旋转可以有效地抑制旋涡脱落。在低转速下存在涡脱落现象，当α> α L时涡脱落现象完全消失，其中α L为临界转速，与Re呈对数关系。当存在旋涡脱落时，Strouhal数几乎保持不变，与α无关。随着α的增大，平均升力线性增大，平均阻力减小，这与位流理论的预测结果有很大的不同。另一方面，升力波动的幅值几乎保持不变，与英寸。
The present study numerically investigates two-dimensional laminar flow past a circular cylinder rotating with a constant angular velocity, for the purpose of controlling vortex shedding and understanding the underlying flow mechanism. Numerical simulations are performed for flows with Re=60, 100, and 160 in the range of 0⩽α⩽2.5, where α is the circumferential speed at the cylinder surface normalized by the free-stream velocity. Results show that the rotation of a cylinder can suppress vortex shedding effectively. Vortex shedding exists at low rotational speeds and completely disappears at α>αL, where αL is the critical rotational speed which shows a logarithmic dependence on Re. The Strouhal number remains nearly constant regardless of α while vortex shedding exists. With increasing α, the mean lift increases linearly and the mean drag decreases, which differ significantly from those predicted by the potential flow theory. On the other hand, the amplitude of lift fluctuation stays nearly constant with in...