Global aerodynamic instability of twin cylinders in cross flow |
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| Institution: | 1. Department of Mechanical and Automation Engineering, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, China;2. Department of Mechanical and Aeronautical Engineering, University of Pretoria, Pretoria 0002, South Africa;1. Department of Aerospace Engineering, Indian Institute of Technology Kanpur;2. Department of Mechanical Engineering, Indian Institute of Technology Kanpur;1. School of Computing, Engineering and Mathematics, Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia;2. Institute for Infrastructure Engineering, Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia;3. School of Mathematics, Physics & Information Science, Zhejiang Ocean University, Zhoushan 316000, China;1. Institute for Turbulence-Noise-Vibration Interactions and Control, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China;2. Key Lab of Advanced Manufacturing Technology, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China;3. School of Civil and Resource Engineering, The University of Western Australia, Australia;1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China;2. School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London E1 4NS, United Kingdom;3. State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China;1. Department of Mechanical Engineering, Faculty of Engineering, Persian Gulf University, Bushehr, Iran;2. Oil and Gas Research Center, Persian Gulf University, Bushehr, Iran |
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| Abstract: | This paper comprises an in-depth physical discussion of the flow-induced vibration of two circular cylinders in view of the time-mean lift force on stationary cylinders and interaction mechanisms. The gap-spacing ratio T/D is varied from 0.1 to 5 and the attack angle α from 0° to 180° where T is the gap width between the cylinders and D is the diameter of a cylinder. Mechanisms of interaction between two cylinders are discussed based on time-mean lift, fluctuating lift, flow structures and flow-induced responses. The whole regime is classified into seven interaction regimes, i.e., no interaction regime; boundary layer and cylinder interaction regime; shear-layer/wake and cylinder interaction regime; shear-layer and shear-layer interaction regime; vortex and cylinder interaction regime; vortex and shear-layer interaction regime; and vortex and vortex interaction regime. Though a single non-interfering circular cylinder does not correspond to a galloping following quasi-steady galloping theory, two circular cylinders experience violent galloping vibration due to shear-layer/wake and cylinder interaction as well as boundary layer and cylinder interaction. A larger magnitude of fluctuating lift communicates to a larger amplitude vortex excitation. |
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| Keywords: | Cylinders Forces Flow structures Instabilities Interactions |
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