Mechanism Responsible for the Complete Suppression of Kármán Vortex in Flows Past a Wavy Square-Section Cylinder

• 作者: 凌国灿 吴应湘 林黎明
• 来源期刊: 中国物理快报(英文版)
• 学科: 物理学
• 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
• 年，卷（期）: 2010,（3）
• 页码范围: 204-207
• 页数: 4页
• 分类号: O359.1 TK222
• 语种: 英文

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.