Numerical investigation on the suppression of VIV for a circular cylinder by three small control rods |
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| Institution: | 1. College of Mechanical and Transportation Engineering, China University of Petroleum (Beijing), Beijing 102249, China;2. Offshore Oil/Gas Research Center, China University of Petroleum (Beijing), Beijing, 102249, China;1. Zachry Department of Civil Engineering, Ocean Engineering Program, Texas A&M University, College Station, TX 77843-3136, USA;2. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200030, China;1. Department of Engineering Technology, Miami University, Middletown, OH 45042, USA;2. Department of Mechanical and Industrial Engineering, University of Massachusetts, Amherst, MA 01003, USA;1. Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad 91775-1111, Iran;2. Division of Civil Engineering, School of Science and Engineering, University of Dundee, Dundee DD1 4HN, UK;1. School of Mechanical & Aerospace Engineering, Nanyang Technological University, Singapore 639798, Republic of Singapore;2. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong SAR, China;3. Singapore Institute of Technology, Singapore 179104, Republic of Singapore |
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| Abstract: | Laminar flow past a circular cylinder with 3 small control rods is investigated by numerical simulation. This study is concerned with the suppression efficacy of vortex induced vibration by small control rods located around a main cylinder. The effects of the attack angle and rod-to-cylinder gap ratio on the hydrodynamics and vibration responses of the main cylinder are investigated. The attack angle of α = 45° is performed as the critical angle for VIV suppression of 3 control rods. The 3 control rods have no effect on VIV suppression when the attack angle is less than the critical angle. The 3 control rods have an excellent VIV suppression efficacy when the attack angle is larger than the critical angle. The transverse vibration frequency of the cylinder with 3 control rods is less than that for an isolated cylinder for all the configurations. The numerical results for the configurations of α = 45° & 60°, G/D = 0.6–1.2 show excellent suppression efficient among the cases investigated in this study. The best suppression efficient is found at α = 45°, G/D = 0.9 for 3 control rods. 2 rods in behind of the main cylinder perform more efficient than that of 1 rod in front for VIV suppression as the gap ratio of G/D less than 1.0. |
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| Keywords: | Laminar flow VIV suppression Control rods CFD FSI |
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