Bimodal vortex shedding in a perturbed cylinder wake
Bimodal vortex shedding in a perturbed cylinder wake
复制标题
DOI：
10.1063/1.2432152
复制
发表时间：
2007-01
影响因子：
4.6
通讯作者：
E. Konstantinidis;S. Balabani;M. Yianneskis
中科院分区：
文献类型：
--
作者：
E. Konstantinidis;S. Balabani;M. Yianneskis
当用适当的方法扰动时，圆柱尾迹显示出不同的旋涡脱落模式。通过对圆柱尾迹在来流速度周期性波动作用下的实验研究，表明了双峰行为是可能的。在给定的实验中，尾流在两种不同的旋涡脱落模式之间来回切换，更具体地说，观察到2S Particip2P转变。没有明显的变化，旋涡形成的时间被发现伴随着过渡。通过对速度场的模态分解，分析了近尾流的对称扰动和固有反对称不稳定性之间的相互作用。
Cylinder wakes display distinct modes of vortex shedding when perturbed by appropriate means. By investigating experimentally the wake of a circular cylinder perturbed by a periodic fluctuation imposed on the inflow velocity, it is shown that bimodal behavior is possible. During a given experiment, the wake switches back and forth between two different vortex shedding modes, more specifically, a 2S↔2P transition is observed. No discernible change in the timing of vortex formation is found to accompany the transition. Modal decomposition of the velocity field is employed to exemplify the interaction of the imposed symmetrical perturbation and the intrinsic antisymmetrical instability of the near wake.