串列双方柱气动干扰机理的数模模拟研究  

Aerodynamics Numerical Simulation Study on Interference Mechanism of Two Square Cylinders in Tandem Arrangement

作　　者：杜晓庆[1,2] 施春林 许汉林 代钦[3,2] DU Xiao-qing;SHI Chun-lin;XU Han-lin;DAI Qin(Department of Civil Engineering,Shanghai University,Shanghai 200444,China;Wind Engineering and Aerodynamic Flow Control Research Center,Shanghai University,Shanghai 200444,China;Shanghai Institute of Applied Mathematics and Mechanics,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学土木工程系,上海200444 [2]上海大学风工程和气动控制研究中心,上海200444 [3]上海大学上海市应用数学和力学研究所,上海200444

出　　处：《科学技术与工程》2018年第27期181-186,共6页Science Technology and Engineering

基　　金：国家自然科学基金(51578330);上海市自然科学基金(14ZR1416000);上海市教委科研创新项目(14YZ004)资助

摘　　要：采用非定常雷诺平均法和SST k-ω湍流模型,在雷诺数Re=2.2×104时对五种间距串列双方柱的绕流场进行了数值模拟。结果表明:随着间距比的增大,串列方柱的气动性能会发生剧烈变化;其绕流场会经历三种不同流态:间距比为S/B=1.2时,下游方柱完全被上游方柱的分离剪切层包裹,流场呈现单一钝体流态;S/B=1.5,2时,在上游方柱上分离的剪切层会再附在下游方柱侧面,流场呈现剪切层再附流态;并在两个方柱之间形成强烈的回流区;S/B=3,4时,两个方柱的尾流中都会形成规则的涡街,流场呈现双涡脱流态。此时上游方柱的旋涡会与下游方柱发生复杂的相互作用,造成下游方柱受到很大的脉动风压作用。The unsteady Reynolds averaged method and SST k-ωturbulence model are used to simulate the flow field around two square cylinders in tandem arrangement at Re=2.2×10 4.The results shows that with the increase of the space ratio,the aerodynamics of the tandem square cylinders will change drastically,and the flow field will have three different flow pattern.When S/B=1.2,the downstream cylinder is completely surrounded by the upstream cylinder separation shear layer,the flow field shows vortex sheet of single mode.As S/B=1.5 and 2,The separation of the shear layer attaches to the downstream cylinder of the side,and the flow field shows reattach mode.Furthermore,there forms a strong recirculation area between two square cylinders.For S/B=3 and 4,vortices appear at the wake of two cylinders with the flow field showing the binary mode.At the same time,the interactions between vortices of the upstream cylinder and the downstream cylinder produce highly fluctuating pressures on the downstream cylinder.

关 键 词：串列方柱 数值模拟 气动性能 流场流态 

分 类 号：TU317.1[建筑科学—结构工程]