NUMERICAL SIMULATION OF THE VORTEX STRUCTURES OF A CIRCULAR. CYLINDER OSCILLATING TRANSVERSELY IN UNIFORM FLOWS
-
摘要: 从涡量流函数形式的N-S方程出发,在不同的振动频率、振幅及Re数下数值研究了均匀来流中横向振动圆柱粘性统流的涡脱泻现象。着重探讨了近迹复杂的涡结构及其非定常演化过程,以及它们对物体受力特性的影响,并首次成功地模拟了近年来实验研究中所发现的一些重要的流动现象,如相位“开关”现象(phase switch phenomena)及复杂涡结构(complex vortex structure),等等。通过数值模拟,不仅能够再现实验研究中所发现的一些重要的流动现象,还可进一步预示某些新的流动现象,使数值计算起到与实验研究相辅相成的作用。Abstract: Vortex shedding from a circular cylinder oscillating transversely in uniform flows is numerically investigated using the Navier-Stokes equations for different oscillating frequencies, amplitudes and Reynolds numbers. The emphasis of this study is put on the complicated vortex structures in the near wake and their influence on the force on the body. A switch phenomenon in the phase of initial vortex shedding and complex vortex patterns, such as 25, 2P and P + S etc. modes, near the fundamental lock-in region...
-
Key words:
- unsteady flow /
- vortex motion /
- separation flow /
- oscillatory flow
-
点击查看大图
计量
- 文章访问数: 1442
- HTML全文浏览量: 58
- PDF下载量: 640
- 被引次数: 0
下载:
