表面粗糙度对近壁圆柱体涡激振动响应影响的数值研究

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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。

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	熊友明
	张壮壮
	高云
	彭庚
	刘黎明
	杨斌

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

Abstract：

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.

Key words： vortex-induced vibration surface roughness near-wall cylinder hydrodynamic coefficient lock-in region

收稿日期: 2020-06-17 出版日期: 2021-10-28

引用本文:

熊友明，张壮壮，高云，彭庚，刘黎明，杨斌. 表面粗糙度对近壁圆柱体涡激振动响应影响的数值研究[J]. 振动与冲击, 2021, 40(20): 108-116.
XIONG Youming，ZHANG Zhuangzhuang，GAO Yun，PENG Geng，LIU Liming，YANG Bin. Numerical study of the effects of surface roughness on vortex-induced vibration response of a circular cylinder near a plane wall. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(20): 108-116.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2021/V40/I20/108

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