Vortex shedding and aerodynamic forces on a circular cylinder in linear shear flow at subcritical Reynolds number |
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| Affiliation: | 1. Wind Engineering Research Center, Tokyo Polytechnic University, 1583 Iiyama, Atsugi, Kanagawa 243-0297, Japan;2. Faculty of Engineering, Miyazaki University, Miyazaki 889-2192, Japan;1. Delft University of Technology, Netherlands;2. Indian Institute of Technology Madras, Chennai, Tamil Nadu 600036, India;1. Department of Civil Engineering, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, No. 800, Dongchuan Road, Shanghai 200240, China;2. State Key Laboratory of Ocean Engineering, Shanghai Jiaotong University, Shanghai, China;3. Institute of Oceanology, Shanghai Jiao Tong University, Shanghai, China;4. Department of Aeronautics, Imperial College London, London SW7 2AZ, UK;5. Department of Civil Engineering, Shanghai University, 99 Shangda Road, BaoShan District, Shanghai 200444, China;6. Cullen College of Engineering, University of Houston, Houston, TX 77204, USA |
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| Abstract: | Vortex shedding and aerodynamic forces on a circular cylinder in a linear shear flow with its axis normal to the plane of the velocity shear profile at subcritical Reynolds number are investigated experimentally. The shear parameter β, which is based on the velocity gradient, cylinder diameter and upstream mean velocity at the center plane of the cylinder, varies from 0 to 0.27. The Strouhal number has no significant variation with the shear parameter. The time-mean base pressure increases and the fluctuating component of the base pressure decreases significantly with increasing shear parameter. Vortex shedding is suppressed by the velocity shear. Dislocation of the stagnation point takes place and this influences the pressure distribution around the cylinder together with the velocity shear. A mean lift force arises in the shear flow due to asymmetry of the pressure distribution, and it acts from the high velocity side to the low velocity side. In addition, the lift coefficient increases and the drag coefficient decreases with increasing shear parameter. |
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