Direct numerical simulation of three-dimensional flow past a yawed circular cylinder of infinite length |
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| Authors: | Ming Zhao Liang Cheng Tongming Zhou |
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| Institution: | 1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China;2. School of Civil, Environmental and Mining Engineering, The University of Western Australia, Crawley, WA 6009, Australia;1. School of Computing, Engineering and Mathematics, University of Western Sydney, Locked Bag 1797, Penrith, NSW 2751, Australia;2. School of Civil, Environmental and Mining Engineering, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia;3. Center for Deepwater Engineering, Dalian University of Technology, Dalian 116024, China;1. School of Computing, Engineering and Mathematics, University of Western Sydney, Locked Bag 1797, Penrith, NSW 2751, Australia;2. Department of Civil Engineering, University of Texas at El Paso, TX 79968, USA;1. Génie civil, Université de Sherbrooke, Sherbrooke, QC, Canada J1K2R1;2. Génie mécanique, Université de Sherbrooke, Sherbrooke, QC, Canada J1K2R1 |
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| Abstract: | Direct numerical simulation of flow past a stationary circular cylinder at yaw angles (α) in the range of 0–60° was conducted at Reynolds number of 1000. The three-dimensional (3-D) Navier–Stokes equations were solved using the Petrov–Galerkin finite element method. The transition of the flow from 2-D to 3-D was studied. The phenomena that were observed in flow visualization, such as the streamwise vortices, the vortex dislocation and the instability of the shear layer, were reproduced numerically. The effects of the yaw angle on wake structures, vortex shedding frequency and hydrodynamic forces of the cylinder were investigated. It was found that the Strouhal number at different yaw angles (α) follows the independence principle. The mean drag coefficient agrees well with the independence principle. It slightly increases with the increase of α and reaches a maximum value at α=60°, which is about 10% larger than that when α=0°. The root-mean-square (r.m.s.) values of the lift coefficient are noticeably dependent on α. |
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