STUDY ON THE FLOW-INDUCED VIBRATIONS OF FOUR SQUARE-ARRANGED CIRCULAR CYLINDERS

被引：0

作者：

Hu Z. ^{[1
,2
]}

Wang J. ^{[2
]}

Sun Y. ^{[2
]}

Zheng H. ^{[2
]}

Fan D. ^{[3
]}

机构：

[1] College of Civil Engineering and Architecture, Huanghuai University, Henan, Zhumadian

[2] School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai

[3] School of Engineering, Westlake University, Hangzhou

来源：

Lixue Xuebao/Chinese Journal of Theoretical and Applied Mechanics | 2024年 / 56卷 / 03期

关键词：

flow-induced vibration; fluid-structure interaction; four square-arranged circular cylinders; vortex-induced vibration; wind tunnel experiment;

D O I：

10.6052/0459-1879-23-575

中图分类号：

学科分类号：

摘要：

Flow-induced vibrations (FIVs) of four square-arranged circular cylinders have been investigated in a wind tunnel at Re = 3200 ~ 28 900. The spacing ratios S/D are from 1.5 to 4.0 (S is the center-to-center spacing between two cylinders and D is the cylinder diameter) and the mass ratio m* ≈ 345.0. Results show that, when S/D ≤ 2.0, cylinder 1 and cylinder 2 (upstream cylinder) present an combined vortex-induced vibration (VIV) and galloping-like response, while cylinder 3 and cylinder 4 (downstream cylinder) present an combined vortex resonance (VR) and wake-induced galloping (WIG) response. When S/D = 2.5 ~ 3.0, cylinder 1 and cylinder 2 are basically close to the VIV of a single cylinder except for weak vibration for large reduced velocity. Both of cylinder 3 and cylinder 4 present a separated VR and WIG response with different amplitudes and response regions. At S/D = 4.0, cylinder 1 and cylinder 2 are almost similar with the single cylinder, while cylinder 3 and cylinder 4 still present a separated VR and WIG and the vibration responses between the downstream cylinders are very close. When the cylinder exhibits VIV (upstream cylinder) or VR (downstream cylinder), the vortex shedding frequency fs will significantly be locked to the first harmonic of the natural frequency fn. As the reduced velocity gradually increases, the cylinders present intense galloping-like response (upstream cylinder) or WIG (downstream cylinder) and the shedding frequencies fs show distinct multiple harmonics. While, the vibration frequency fo only can be locked to the natural frequency fn. By summarizing the vibration amplitudes characteristics of the four square-arranged and the two cylinders, it can be found that there exist similar vibration patterns among them and the dynamic response law of the two cylinders system are still applicable to the four square-arranged cylinders. © 2024 Chinese Society of Theoretical and Applied Mechanics. All rights reserved.

引用

页码：670 / 681

页数：11

共 31 条

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