Dynamic response of a turbulent cylinder wake to sinusoidal inflow perturbations across the vortex lock-on range
Dynamic response of a turbulent cylinder wake to sinusoidal inflow perturbations across the vortex lock-on range
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DOI：
10.1063/1.3592330
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发表时间：
2011-07
影响因子：
4.6
通讯作者：
E. Konstantinidis;C. Liang
中科院分区：
文献类型：
--
作者：
E. Konstantinidis;C. Liang
采用大涡模拟方法研究了圆柱湍流尾流对叠加在平均速度上的正弦扰动的动力响应。扰动频率在整个涡流锁定范围内以平均速度的5%的恒定振幅（对应于雷诺数2580）变化。的瞬时，时间平均和相位平均特性的近尾流和流体力的气缸上的效果报告。本模拟实验实现的比较表明，非定常三维分离流的物理很好地再现。模拟捕捉到尾流结构的修改，包括回流气泡和涡形成区域的收缩和尾流波动和涡强度的增强在锁定制度。这些尾流效应伴随着定常和非定常阻力的增加，以及作用在尾流上的非定常升力的增加。
Large-eddy simulations are employed to investigate the dynamic response of the turbulent wake of a circular cylinder to sinusoidal perturbations in the inflow velocity superposed on a mean component. The perturbation frequency is varied across the vortex lock-on range at a constant amplitude of 5% of the mean velocity corresponding to a Reynolds number of 2580. The effect on the instantaneous, time-averaged and phase-averaged characteristics of the near-wake flow and fluid forces on the cylinder is reported. Comparisons of the present simulations to experimental realizations show that the physics of the unsteady three-dimensional separated flow are well reproduced. The simulations capture the modification of the wake structure including the shrinking of the recirculation bubble and vortex-formation region and the enhancement of the wake fluctuations and vortex strength in the lock-on regime. These wake effects are accompanied by an increase in the steady and unsteady drag and the unsteady lift acting on t...