亚临界雷诺数下圆柱绕流的大涡模拟  

LARGE EDDY SIMULATION OF THE TURBULENT FLOW AROUND A CIRCULAR CYLINDER AT SUB-CRITICAL REYNOLDS NUMBERS

作　　者：苏铭德[1] 康钦军[1] 

机构地区：[1]清华大学工程力学系,北京100084

出　　处：《力学学报》1999年第1期100-105,共6页Chinese Journal of Theoretical and Applied Mechanics

基　　金：国家自然科学基金

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。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.

关 键 词：圆柱绕流 大涡模拟 亚格子模式 N-S方程 

分 类 号：O357.1[理学—流体力学]