| Mechanism Responsible for the Complete Suppression of Kármán Vortex in Flows Past a Wavy Square-Section Cylinder |
| |
| 作者姓名： | 林黎明 凌国灿 吴应湘 |
| |
| 作者单位： | [1]The Division of Engineering Sciences, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190 [2]The Stake Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190 |
| |
| 基金项目： | Supported by the National High-Tech Research and Development Program of China under Grant No 2006AA09Z350, and the Knowledge Innovation Program of Chinese Academy of Sciences under Grant No KJCX2-YW-L02. |
| |
| 摘 要： | The Kármán vortex shedding is totally suppressed in flows past a wavy square-section cylinder at a Reynolds number of 100 and the wave steepness of 0.025. Such a phenomenon is illuminated by the numerical simulations. In the present study, the mechanism responsible for it is mainly attributed to the vertical vorticity. The geometric disturbance on the rear surface leads to the appearance of spanwise flow near the base. The specific vertical vorticity is generated on the rear surface and convecting into the near wake. The wake flow is recirculated with the appearance of the pair of recirculating cells. The interaction between the upper and lower shear layers is weakened by such cells, so that the vortex rolls could not be formed and the near wake flow becomes stable.
|
| 关 键 词： | 卡门涡 分气缸 流动 机制 波浪 垂直涡度 数值模拟 相互作用 |
| 本文献已被 维普 等数据库收录！ |
|
