Numerical simulation of force and wake mode of an oscillating cylinder |
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| Institution: | 1. School of Energy and Safety Engineering, Tianjin Chengjian University, Tianjin 300384, PR China;2. School of Architecture, South China University of Technology, Guangzhou 510641, PR China;1. School of Aeronautics and Astronautics, Sun Yat-sen University, Guangzhou, China;2. Department of Civil and Environmental Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China;3. Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, China;4. School of Aeronautics and Astronautics, Dalian University of Technology, Dalian 116024, China;5. WSP (Asia) Ltd, Kowloon Bay, Kowloon, Hong Kong SAR, China |
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| Abstract: | The turbulent flow behind a circular cylinder subjected to forced oscillation is numerically studied at a Reynolds number of 5500 by using three-dimensional Large Eddy Simulations (3-D LES) technique with the Smagorinsky model. The filtered equations are discretised using the finite volume method with an O-type structured grid and a second-order accurate method in both time and space. Firstly, the main wake parameters of a stationary cylinder are examined and compared in the different grid resolutions. Secondly, a transversely oscillating cylinder with a constant amplitude in a uniform flow is investigated. The cylinder oscillation frequency ranges between 0.75 and 0.95 of the natural Kármán frequency, and the excitation amplitude is moderate, 50% of the cylinder diameter. The flow characteristics of an oscillating cylinder are numerically examined and the corresponding wake modes are captured firstly in 3-D LES at Re=5500. A transition between different wake modes is firstly investigated in a set of numerical simulations. |
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| Keywords: | Forced oscillation Vortex-induced vibration Wake mode response Bluff-body wake 3-D large eddy simulations Turbulent flow |
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