基于高雷诺数的并联双圆柱绕流研究  

Numerical investigation of the flow around two side-by-side circular cylinders based on high Reynolds number

作　　者：庞建华[1] 宗智[1] 周力[1] 

机构地区：[1]大连理工大学工业装备与结构分析国家重点实验室,辽宁大连116024

出　　处：《船舶力学》2017年第7期791-803,共13页Journal of Ship Mechanics

基　　金：973资助项目(2013CB036101);国家自然科学基金重点资助项目(51639003);国家自然科学基金项目(51679037;51279030);高技术船舶专项资助

摘　　要：文章采用基于边界瞬时涡量守候的拉格朗日方法(IVCBC),结合并列双圆柱的特点,建立了双圆柱绕流数值计算模型。对高雷诺数下Re=6×10~4,间隙率为T/D=1.1~7的并联圆柱双圆柱二维绕流特性进行了研究。提出了双圆柱间隙中点的速度区别宽窄尾流的新方法。分别讨论了流体力系数随间距增加的特点,脉动流体力的特点,尾流特征以及斯托哈尔数特征。研究发现:区别宽窄尾流的新方法是可靠的;在双圆柱尾流附近有五种尾流模型存在;同时发现了在宽窄尾流的频率,存在一个中间频率。A novel pure-Lagrangian vortex method based on instantaneous vorticity conserved boundary conditions （ IVCBC） was applied to investigate the hydrodynamic coefficients and patterns of two-dimension-al flow around two circular cylinders in side-by-side arrangements with pitch ratios T/D=1.1-7 at a high4Reynolds number Re=6×10 . The benchmark case of viscous flow around a circular cylinder was first car-ried out to validate the novel vortex method. Then simulations of the flow around two side by side circular cylinders were performed. A new scheme was proposed to distinguish the wide wake （WW） and narrow wake （ NW） byjudging the velocity direction of a specific point in the gap flow. The hydrodynamic coefficients and Strouhal numbers were thoroughly studied as a function of the pitch ratios. A total of five kinds of flow patterns were identified. During the investigation of biased flow, an intermediate frequency between frequen-cies of NW and WW was found and approached to that of a single cylinder. The results show good agree-ment with the previously published experimental and numerical data.

关 键 词：(IVCBC)涡方法 并联双圆柱 宽窄尾流 高雷诺数 中间频率 

分 类 号：O35[理学—流体力学]