Vortex-induced vibration of cylinder under sub-critical Reynolds number

ZHOU Li; QIU Zhongqiu; YUAN Yashuai; ZONG Zhi

doi:10.19693/j.issn.1673-3185.02694

Volume 17 Issue 3

Jun. 2022

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Article Navigation > Chinese Journal of Ship Research > 2022 > 17(3): 145-152

ZHOU L, QIU Z Q, YUAN Y S, et al. Vortex-induced vibration of cylinder under sub-critical Reynolds number[J]. Chinese Journal of Ship Research, 2022, 17(3): 145–152 doi: 10.19693/j.issn.1673-3185.02694

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Vortex-induced vibration of cylinder under sub-critical Reynolds number

doi: 10.19693/j.issn.1673-3185.02694

School of Naval Architecture Engineering, Dalian University of Technology, Dalian 116024, China

Received Date: 2021-12-07
Rev Recd Date: 2022-02-17

Available Online: 2022-06-17

Publish Date: 2022-06-30

Abstract

This is an Open Access article distributed under the terms of the Creative Commons Attribution 4.0 International License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Objective In order to achieve the accurate prediction of the amplitude response of a vortex-induced vibrating cylinder under the sub-critical Reynolds number, a method for establishing a Cl-A/D (lift coefficient-amplitude ratio)model of the forced vibration of the cylinder by numerical simulation is proposed. Methods Based on the Realizable k-ε model, a two-dimensional numerical simulation of the forced vibration of a cylinder is carried out using the finite volume method. The calculated lift coefficient curves under different amplitude ratios A/D in the range of excitation frequency ratio f_e/f_n=1 are obtained. The lift coefficient corresponding to the maximum vibration velocity of the cylinder is then selected to establish the Cl-A/D model. Results The results show that the overall trend of the Cl-A/D fitting curve is in good agreement with the predicted results of SHEAR7. At the same time, it is found that the "zero lift coefficient" points under each excitation frequency ratio f_e/f_n are all located near the amplitude ratio A/D=0.8, and the wake shedding mode changes around A/D=0.8 from "P+S" to "2P" (P represents a pair of vortex shedding with opposite rotation directions, and S represents a single vortex shedding). In the vortex-induced vibration experiment of a single cylinder, the maximum amplitude when "lock-in" occurs is around 0.8D. Conclusions The amplitude ratio corresponding to the "zero lift coefficient" of the Cl-A/D model of forced vibrating cylinder under sub-critical Reynolds number is consistent with the maximum response amplitude ratio of the cylinder under vortex-induced vibration, and the shedding mode of the wake vortex changes under this amplitude ratio.
- vortex-induced vibration,
- forced oscillation,
- vortex shedding mode,
- amplitude ratio,
- frequency ratio

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References(20)

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