| 亚临界雷诺数下圆柱绕流的大涡模拟 |
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| 引用本文： | 苏铭德,康钦军. 亚临界雷诺数下圆柱绕流的大涡模拟[J]. 力学学报, 1999, 31(1): 100-105. DOI: 10.6052/0459-1879-1999-1-1995-010 |
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| 作者姓名： | 苏铭德 康钦军 |
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| 作者单位： | 清华大学工程力学系; |
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| 摘 要： | 本文应用Smagorinsky涡粘性模式和二阶精度的有限体积法对圆柱绕流的流场进行大涡模拟．求解了非正交曲线坐标系下的N-S方程，对雷诺数为100和20000的工况进行了计算．计算结果与实验及动力涡粘性模式的结果进行了比较，表明计算对于层流及高亚临界雷诺数的湍流流动是合理的
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| 关 键 词： | 圆柱绕流 大涡模拟 亚格子模式 |
LARGE EDDY SIMULATION OF THE TURBULENT FLOW AROUND A CIRCULAR CYLINDER AT SUB-CRITICAL REYNOLDS NUMBERS |
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| Su Mingde,Kang Qinjun. LARGE EDDY SIMULATION OF THE TURBULENT FLOW AROUND A CIRCULAR CYLINDER AT SUB-CRITICAL REYNOLDS NUMBERS[J]. chinese journal of theoretical and applied mechanics, 1999, 31(1): 100-105. DOI: 10.6052/0459-1879-1999-1-1995-010 |
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| Authors: | Su Mingde Kang Qinjun |
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| Abstract: | The performance of the Smagorinsky eddy-viscosity subscale grid model and the suitability of second-order accurate finite volume scheme for large eddy simulations of complex flows are investigated in the case of turbulent wake behind a nominally two-dimension cylinder at subcritical Reynolds number 20000 based on freestream velocity and cylinder diamter. The numerical method is applied to the incompressible Navier-Stokes equation written in generalized nonorthogonal coordinates, which has the following main features: use of the conservation form of the governing equations, non-staggered variable arrangement, Cartesian velocity components instead of grid-aligned velociyt components, the SIMPLEC algorithm to handle the pressure-velocity coupling, a apecial momentum interpolation precedure developed by Rhie and Chow to avoid spurious oscillations usually encountered with the non-staggered grid. The calculation of laminar flow of Reynolds munber 100is to verify the reliability of the program.The results are compared with experimental data and numerical results with dynamic subgrid scale eddy-viscosity model. The comparison shows that the present results is acceptable for the laminar flow and turbulent with higher subcritical Reynolds number,but the three dimensional effect is non-negligible, therefore,the 3D simulation is neccesary in this problem. |
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| Keywords: | flow around a cylinder large eddy simulation subscale grid model |
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