• 学报（中文） •

### 不同表面粗糙度下圆柱体涡激振动响应特性数值研究

1. 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 Li3

1. 1. 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

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.