Effects of mass ratio on the vortex-induced vibration of two types of tandem circular cylinders

被引：0
|
作者：
Du X. [1 ]
Tang C. [1 ]
Zhao Y. [2 ]
Wu G. [1 ]
Yang X. [1 ]
机构：
[1] School of Mechanics and Engineering Science, Shanghai University, Shanghai
[2] School of Civil Engineering & Architecture, Taizhou University, Taizhou
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2022年 / 41卷 / 06期
关键词：
Fluid-structure interaction mechanism; Mass ratio; Numerical simulation; Twin tandem cylinders; Vortex-induced vibration;
D O I：
10.13465/j.cnki.jvs.2022.06.021
中图分类号：
学科分类号：
摘要：
To clarify the effects of mass ratio and the vibration conditions of the upstream cylinder (a fixed or a vibrated upstream cylinder) on the vortex-induced vibration of two tandem circular cylinders, numerical simulations were carried out at a Reynolds number of 100 with an intermediate pitch ratio of P/D=4, where P is the distance between the centers of two cylinders and D is the diameter of the cylinder. The effects of the mass ratio (m* = 2, 10 and 20) and the vibration conditions of the upstream cylinder on vibration characteristics and flow patterns of the two tandem circular cylinders were analysed. The vibration generation mechanism was explored. The results show that the vibration amplitude of the downstream cylinder decreases with the increase of mass ratio. Compared with a fixed upstream cylinder, a vibrated upstream cylinder would induce a larger transverse vibration amplitude of the downstream cylinder under the same mass ratio. For a vibrated upstream cylinder, apparent "lock-in" regions are observed on both cylinders under all the three mass ratios, and yet a "soft lock-in" phenomenon arises on both cylinders under the smaller mass ratio of 2. For a fixed upstream cylinder, the "lock-in" region has not been detected. Three identical wake flow modes, i.e., "2S" mode, irregular mode and parallel vortex street mode, are observed in the wake district of the two tandem cylinders under all the three mass ratios. There are two fluid-solid coupled vibration generation mechanisms, namely, vortex impingement and vortex fusion, arising in the wake district of the two tandem cylinders for the two types of upstream cylinders. © 2022, Editorial Office of Journal of Vibration and Shock. All right reserved.
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页码：160 / 168
页数：8
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