低雷诺数圆柱绕流的大涡模拟分析  

Investigation of flow cross cylinder using large eddy simulation at low Re

作　　者：李霖[1] 张志国[1] 王先洲[1] 冯大奎[1] 

机构地区：[1]华中科技大学船舶与海洋工程学院,湖北武汉430074

出　　处：《舰船科学技术》2013年第1期22-26,共5页Ship Science and Technology

基　　金：国家自然科学基金资助(51009070);"863计划"课题资助(2012AA091002);中央高校基本科研业务费资助(0109140919)

摘　　要：以二维圆柱为研究对象,采用大涡模拟的方法对圆柱绕流进行数值模拟。计算的雷诺数Re=400。计算结果能够清晰地反映卡门涡街的周期性脱落。通过对圆柱表面压力分布的深入探究,揭示圆柱尾流中产生周期性旋涡脱落的原因。研究结果中的阻力、升力呈周期性变化规律以及斯特劳哈尔数(St)都与前人实验结果较好吻合,说明大涡模拟能够对低雷诺数的圆柱绕流进行准确的模拟。In this paper large eddy simulation is used to simulate the flow cross a 2D cylinder. The Reynolds number of the simulation is 400. The alternate eddy formation and shedding is captured precisely in this paper. The analysis of pressure distribution on cylinder reveals the mechanism of Karman vortex street. The drag,lift and Strouhal number obtained by simulation shows a good match with available data from the reference and literature. The large eddy simulation method shows a high quality on the flow field simulating and more attention should be paid on in the future.

关 键 词：大涡模拟 圆柱绕流 卡门涡街 压力分布 

分 类 号：O351.3[理学—流体力学]