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Wind and Structures Volume 29, Number 1, July 2019 , pages 43-53 DOI: https://doi.org/10.12989/was.2019.29.1.043 |
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Flow-induced vibrations of three circular cylinders in an equilateral triangular arrangement subjected to cross-flow |
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Weilin Chen, Chunning Ji, Md. Mahbub Alam and Dong Xu
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| Abstract | ||
| Vortex-induced vibration of three circular cylinders (each of diameter D) in an equilateral triangular arrangement is investigated using the immersed boundary method. The cylinders, with one placed upstream and the other two side-by-side downstream, are free to vibrate in the cross-flow direction. The cylinder center-to-center spacing L is adopted as L/D = 2.0. Other parameters include the Reynolds number Re = 100, mass ratio m* = 2.0, reduced velocity Ur = 2 ~ 15 and damping ratio = 0. Cylinder vibration responses are dependent on Ur and classified into five regimes, i.e. Regime I (Ur < 3.2), Regime II (3.2 < Ur < 5.0), Regime III (5.0 < Ur < 6.4), Regime IV (6.4 < Ur < 9.2) and Regime V (Ur > 9.2). Different facets of vibration amplitude, hydrodynamic forces, wake patterns and displacement spectra are extracted and presented in detail for each regime. | ||
| Key Words | ||
| vortex-induced vibration; circular cylinder; triangular arrangement; immersed boundary method | ||
| Address | ||
| Weilin Chen and Dong Xu: State Key Laboratory of Hydraulic Engineering Simulation & Safety, Tianjin University, Tianjin, 300072, China Chunning Ji:State Key Laboratory of Hydraulic Engineering Simulation & Safety, Tianjin University, Tianjin, 300072, China; Collaborative Innovation Centre for Advanced Ship and Deep-Sea Exploration, Shanghai 200240, China Md. Mahbub Alam: Institute for Turbulence-Noise-Vibration Interaction and Control, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China | ||