Numerical evaluation of passive control of VIV by small control rods |
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| Institution: | 1. Mechanical Engineering, Department of Mechanical Engineering, Bu-Ali Sina University, Hamadan, Iran;1. Center for Deepwater Engineering, Dalian University of Technology, Dalian 116024, China;2. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;3. Department of Computer, Zhejiang Ocean University, Zhoushan 316000, China;4. School of Computing, Engineering and Mathematics, University of Western Sydney, Locked Bag 1797, Penrith, NSW 2751, Australia;5. School of Civil and Resource Engineering, The University of Western Australia, 35 Stirling Highway, WA 6009, Australia;1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin, 300072, China;2. Collaborative Innovation Centre for Advanced Ship and Deep-Sea Exploration, Shanghai, 200240, China;3. School of Civil Engineering, Tianjin University, Tianjin, 300072, China;4. School of Marine Science and Technology, Newcastle University, Newcastle upon Tyne, NE1 7RU, United Kingdom |
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| Abstract: | Flow past a circular cylinder with multiple small control rods is studied by numerical simulation for ReD ranging from 1161.3 to 6387.1. The Reynolds-Averaged-Navier–Stokes (RANS) equations and shear stress transport (SST) k ? ω turbulence model are used to calculate the vortex field, while a fourth-order Runge–Kutta method is employed for evaluating the structure dynamics of the cylinder group. Comparisons with experimental results demonstrate the validation of this method. This study is concerned with the vortex induced vibration (VIV) suppression efficacy of small control rods placed around a main cylinder. The effects of control rod number, diameter ratio, spacing ratio and Reynolds number on the hydrodynamics and vibration responses of the main cylinder are investigated. The reduced percents of in-line and cross-flow amplitudes and the increased percents of the whole cross-sectional area of cylinders and the drag coefficient are used to give a comprehensive evaluation. Results of simulation indicate that placing small rods with appropriate number at appropriate locations can achieve good suppression effectiveness at a wide range of Reynolds number. The numerical result for the case with nine control rods, diameter ratio of 0.15 and spacing ratio of 0.6 shows the best suppression effect among the cases investigated in this study. |
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| Keywords: | VIV suppression Control rod Vortex shedding CFD Simulation |
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