两类串列圆柱涡激振动的质量比效应

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Abstract To clarify the effects of mass ratio and the vibration conditions of the upstream cylinder (a fixed or a vibrated upstream cylinder) on 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 two tandem circular cylinders were analyzed as well as their mechanisms. Results show that the vibration amplitudes of the downstream cylinders decrease 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 of the same mass ratio. For a vibrated upstream cylinder, apparent “lock-in” regions are observed for both cylinders at three mass ratios. Note that a “soft lock-in” phenomenon arises for both cylinders at the mass ratio of 2. For a fixed upstream cylinder, the “lock-in” region is not detected. Three identical wake flow modes, i.e., “2S” mode, irregular mode and parallel vortex street mode, are observed in the wake region of two tandem cylinders for all three mass ratios. Two flow generation mechanisms, namely, vortex impingement and vortex fusion, arise in the wake of two tandem cylinders for two types of upstream cylinders.

Key words： twin tandem cylinders vortex-induced vibration mass ratio numerical simulation fluid-structure interaction mechanism

Received: 21 September 2020 Published: 28 March 2022

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	Articles by authors
	DU Xiaoqing1
	TANG Chenxin1
	ZHAO Yan2
	WU Gefei1
	YANG Xiao1

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DU Xiaoqing1,TANG Chenxin1,ZHAO Yan2, et al. Effects of mass ratio on the vortex-induced vibration of two types of tandem circular cylinders[J]. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(6): 160-168.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2022/V41/I6/160

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