亚临界雷诺数下圆柱和方柱绕流数值模拟  

Numerical simulation of the flow around circular and square cylinder at sub-critical Reynolds numbers

作　　者：沈立龙 刘明维[1,2] 吴林键[1,2] 李鹏飞[1,2] 舒丹[1,2] 

机构地区：[1]重庆交通大学国家内河航道整治工程技术研究中心,水利水运工程教育部重点实验室,重庆400074 [2]重庆交通大学河海学院,重庆400074

出　　处：《水道港口》2014年第3期227-233,共7页Journal of Waterway and Harbor

基　　金：国家科技支撑计划项目(2012BAB05B04)

摘　　要：基于RNG k-ε模型,采用有限体积法对亚临界雷诺数条件下（Re=3×102～3×105）的二维单圆柱和单方柱绕流进行数值模拟与仿真。得到了圆柱和方柱绕流阻力系数Cd与Strouhal数随雷诺数的变化规律。同时对雷诺数Re=22 000下的圆柱、方柱绕流相关特性进行详细对比分析。计算结果表明：同一雷诺数下,单圆柱绕流阻力系数Cd较单方柱低,但圆柱的Strouhal数较单方柱则要高。虽然二者边界层分离点不同,但流场的演变与漩涡的脱落具有一定相似特性。With the RNG κ-ε model and the finite volume method,the flow around a two-dimensional circular cylinder and a two-dimensional square cylinder at sub-critical Reynolds numbers was simulated and evaluated,and the trends of drag coefficients and Strouhal numbers with the change of Reynolds numbers from 3×10～2 to 3×10～5 were obtained.Meanwhile,characteristics of the flow around a circular cylinder and a square cylinder at Re=22 000 have been compared and analyzed in detail.Calculation results show that drag coefficient of flow around a circular cylinder is lower than the drag coefficient of flow around a square cylinder with the same Reynold number.However,the Strouhal number of flow around a circular cylinder is slightly higher than the Strouhal number of flow around a square cylinder.Though their boundary layer separation points are different,the flow field evolution and the vortex shedding of two cylinders have some similarities.

关 键 词：亚临界雷诺数 圆柱和方柱 绕流 数值模拟 RNG k-ε模型 

分 类 号：TV143.2[水利工程—水力学及河流动力学]