摘要
使用数值模拟方法,研究了表面粗糙度对近壁圆柱体涡激振动响应的影响,对不同粗糙度下近壁圆柱体的振动幅值、振动频率、锁定区间、升力系数、拖曳力系数、斯脱哈尔数以及振动轨迹等参数进行了对比分析。分析结果显示:基于近壁圆柱体振动幅值以及振动频率变化趋势,可以将整个折合速度区间依次划分为三个区间:初始分支、锁定区间以及解锁区间。随着粗糙度的上升,近壁圆柱体横向振幅最大值呈上升趋势,锁定区间宽度逐渐变窄,拖曳力系数均值呈下降趋势。锁定区间里,较大的横向振幅使得壁面效应大幅增加,进一步导致升力系数均值明显大于0。
The effects of surface roughness on the vortex-induced vibration(VIV)responses of a circular cylinder near a plane wall were studied numerically.The vibration amplitude,vibration frequency,lock-in region,lift force coefficient,drag force coefficient,Strouhal number and vibration trajectory of a near-wall cylinder with different surface roughnesses were compared.The analysis results show that the whole reduced velocity range can be divided into three regimes:initial branch,lock-in region,and desynchronization region based on the variation tendency of the vibration amplitude and frequency.As surface roughness increases,the maximum VIV amplitude in the cross-flow direction increases,the width of the lock-in region becomes narrower,and the mean drag coefficient displays decreasing tendency.During the lock-in region,large vibration amplitude results in significant increase of the wall proximity effect,further leading to the mean lift force coefficient obviously larger than zero.
作者
熊友明
张壮壮
高云
彭庚
刘黎明
杨斌
XIONG Youming;ZHANG Zhuangzhuang;GAO Yun;PENG Geng;LIU Liming;YANG Bin(State Key Laboratory of Oil and Gas Reservoir Geology and Exploration,Southwest Petroleum University,Chengdu 610500,China;School of Ocean Engineering,Harbin Institute of Technology,Weihai 264209,China;State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China;Engineering Technology Research Institute,PetroChina Southwest Oil and Gasfield Company,Chengdu 610031,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2021年第20期108-116,134,共10页
Journal of Vibration and Shock
基金
国家自然科学基金(51609206)
大连理工大学海岸和近海工程国家重点实验室开放基金(LP2002)
中国石油西南油气田公司博士后项目(20200302-07)。
关键词
涡激振动
表面粗糙度
近壁圆柱体
流体力系数
锁定区间
vortex-induced vibration
surface roughness
near-wall cylinder
hydrodynamic coefficient
lock-in region
