1. 西南石油大学 油气藏地质及开发工程国家重点实验室, 成都 610500； 2. 东京大学 机械工程学院, 东京 113-8656； 3. 大连理工大学 船舶工程学院, 辽宁 大连 116024
基金资助:国家自然科学基金项目 (51609206, 51522902, 51379033, 11502220), 国家留学基金项目 (201608515007)Numerical Study of the Vortex Induced Vibrations of a Circular Cylinder with Different Degrees of Surface Roughness
GAO Yun1, 2,ZHENG Wenlong1,XIONG Youming1,ZOU Li31. State Key Laboratory of Oil and Gas Reservoir Geology and Exploration, Southwest Petroleum University, Chengdu 610500, China; 2. School of Mechanical Engineering, The University of Tokyo, Tokyo 113-8656, Japan; 3. School of Naval Architecture, Dalian University of Technology, Dalian 116024, Liaoning, China
摘要/Abstract
摘要： 使用数值模拟方法，研究了不同粗糙度下圆柱体的涡激振动响应特性，对圆柱体的涡激振动位移响应幅值、响应频率、涡激力、漩涡泄放模式以及涡激振动位移响应与涡激力之间的相位角等参数进行了分析.结果表明，圆柱体涡激振动响应幅值随着粗糙度的上升呈下降趋势.当圆柱体表面光滑或表面粗糙度较小时，涡激振动响应可分为初始分支、上分支以及低分支.在初始分支以及上分支区间，圆柱体尾部漩涡泄放模式呈2S模式；在低分支区间，圆柱体尾部漩涡泄放模式呈2P模式.当圆柱体表面粗糙度较大时，涡激振动响应仅存在初始分支和低分支.初始分支区间，尾部漩涡泄放模式呈2S模式；低分支区间，尾部漩涡泄放模式呈2P模式.
关键词: 表面粗糙度, 圆柱体, 涡激振动, 漩涡泄放模式, 相位角
Abstract: The vortex-induced vibration (VIV) characteristics of a circular cylinder with different degrees of surface roughness was studied numerically. The response amplitude, response frequency, vortex force, vortex shedding flow pattern and phase angle between the VIV displacement and the vortex force with different degrees of surface roughness were compared. The numerical results show that the VIV amplitude decreases with increase of surface roughness. For smooth cylinder or the cylinder with small surface roughness, the VIV response could be divided into three branches: initial branch, upper branch and lower branch. Within initial and upper branches, the vortex shedding flow pattern displays 2S mode. However, it produces 2P mode within lower branch. For the cylinder with large surface roughness, the VIV response only could be divided into two branches: initial branch and lower branch. The vortex shedding flow pattern displays 2S mode within initial branch, while it displays 2P mode within lower branch.
Key words: surface roughness, circular cylinder, vortex induced vibration, flow pattern of vortex shedding, vortex phase
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