Numerical modeling of interaction of a current with a circular cylinder near a rigid bed |
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| Authors: | M Salih Kirkgoz A Alper Oner M Sami Akoz |
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| Affiliation: | 1. Centre for Offshore Foundation Systems, The University of Western Australia, Crawley, WA 6009, Australia;2. School of Civil, Environmental and Mining Engineering, The University of Western Australia, Crawley, WA 6009, Australia;3. Upstream Oil & Gas Solutions, Woodside Energy Ltd., Perth, WA 6000, Australia;1. Institute for Turbulence-Noise-Vibration Interaction and Control, Shenzhen Graduate school, Harbin Institute of Technology, Shenzhen 518055, China;2. School of Mechanical Engineering, University of Adelaide, Adelaide, Australia;3. Center for Engineering Research, Research Institute, King Fahd University of Petroleum and Minerals, Dhahran-31261, Saudi Arabia;4. State Key Laboratory of Hydraulic Engineering Simulation & Safety, Tianjin University, Tianjin 300072, China;1. School of Civil and Resource Engineering, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia;2. Institute of Mechanics, Chinese Academy of Sciences, 15 Beisihuanxi Road, Beijing 100190, China;3. Stake Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;4. Department of Transport, 1 Essex Street, Fremantle, WA 6160, Australia |
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| Abstract: | The numerical modeling of 2D turbulent flow around a smooth horizontal circular cylinder near a rigid bed with gap ratio G/D = 0.3 at Reynolds number ReD = 9500 is investigated. Ansys® 10.0-FLOTRAN program package is used to solve the governing equations by FEM, and the performance of the standard k ? ε, standard k ? ω, and SST turbulence models are examined. A sensitivity study for the three turbulence models is carried out on three computational meshes with different densities near the cylinder surface. The computational velocity fields and the Strouhal numbers from the present simulations are compared with those obtained from the PIV measurement. It is found that the time-averaged velocity field of the flow in the proximity of the cylinder is closely affected by the mesh resolution near the cylinder surface, and the mesh refinement in radial direction improves the results of present simulations. The shedding of vortices in the cylinder wake is not predicted by k ? ε model on all the three meshes. The results for the time-averaged velocity field show that the numerical modeling using either of k ? ω and SST turbulence models on the finest mesh used on the cylinder surface is reasonably successful. |
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