The effect of slip distribution on flow past a circular cylinder |
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| Institution: | 1. State Key Laboratory for Turbulence and Complex Systems, Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing 100871, China;2. Mechanical and Aerospace Engineering Department, Rutgers, The State University of New Jersey, 98 Brett Rd, Piscataway, New Jersey 08854, USA;3. Key Laboratory of High Energy Density Physics Simulation, Center for Applied Physics and Technology, Peking University, Beijing 100871, China;4. State Key Laboratory of Nonlinear Mechanics (LNM), Institute of Mechanics, Chinese Academy of Science, Beijing 100190, China;1. Department of Chemical Engineering, Indian Institute of Technology Hyderabad, Yeddumailaram 502 205, Telangana, India;2. Department of Mechanical Engineering, University of Thessaly, Volos 38334, Greece;3. Department of Chemical Engineering, Imperial College London, South Kensington Campus, SW7 2AZ, United Kingdom;1. State Key Laboratory of Aerodynamics, Mianyang, Sichuan 621000, China;2. Institute for Turbulence–Noise–Vibration Interaction and Control, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China;3. Shenzhen Key Laboratory of Urban Planning and Decision Making, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China;4. Parsons Brinckerhoff (Asia) Ltd., Kowloon Bay, Kowloon, Hong Kong Special Administrative Region;5. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong Special Administrative Region |
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| Abstract: | A slip boundary has been shown to have a significant impact on flow past bluff bodies. In this work and using a circular cylinder as a model system, the effects of various slip configurations on the passing flow are investigated. A theoretical analysis using matched-asymptotic expansion is first performed in the small-Reynolds number regime following Stokes and Oseen. A slip boundary condition is shown to lead to only higher-order effects (~1/ln(Re)) on the resulting drag coefficient. For higher Reynolds numbers (100–500), the effects of five types of symmetric slip boundary conditions, namely, no slip, fore-side slip, aft-side slip, flank slip, and all slip on the flow field and pertinent parameters are investigated with numerical simulations. Detailed results on the flow structure and force distribution are presented. Flank slip is found to have the best effect for drag reduction with comparable coverage of slip area. For asymmetric slip distributions, torque and lift are found to generally occur. |
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| Keywords: | Slip boundary Circular cylinder Drag reduction |
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