等直径串列双圆柱体绕流的数值模拟  

Numerical Simulation of Flow Around Two Tandem Circular Cylinders of Equal Diameter

作　　者：刘景伟[1] 郭海燕[1] 赵婧[1] 

机构地区：[1]中国海洋大学工程学院,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2013年第12期92-97,共6页Periodical of Ocean University of China

基　　金：国家高技术研究发展计划项目(2010AA09Z303)资助

摘　　要：在不同的亚临界雷诺数Re和柱间距比G/D条件下,运用Fluent软件对等直径串列双圆柱体的绕流现象进行数值模拟。根据模拟结果,分析了Re和G/D对漩涡脱落形态、压力系数Cp和斯特劳哈尔数St的影响规律。结果表明:随着柱间距的变化,双圆柱体的尾流呈现不同的漩涡脱落形式,出现相同尾流形态的G/D范围,会随着Re的变化而发生改变。由于受下游圆柱体干涉效应的影响,上游圆柱体的剪切层分离点位置随着G/D的增大而逐渐后移,当达到某一临界值后,干涉效应消失,Cp分布和剪切层分离点与单圆柱体相似。与此同时,St也随着G/D的变化而发生改变,其变化规律与不同的漩涡脱落形态相对应。Flow around two tandem circular cylinders of equal diameter were simulated by Fluent with different subcritical Reynolds numbers and ratios of gap to diameter （G/D）. Based on the obtained simu lation results, effects of Re and G/D on vortex shedding patterns, pressure coefficients （Cp） and Strouhal numbers （St） were investigated. Results show that shedding patterns around two tandem circular cylin ders changes with G/D, and the range of G/D in which the same pattern forms also changes when Re al ters. Because of the interference effects of downstream cylinder, separated point of shear layer backwards when G/D increases, the interference effects disappear when G/D reaches a critical value, and the Cp dis tributions and separated point are same as the single cylinder. What＇s more, the St curves also change in accordance with different vortex shedding patterns when G/D alters.

关 键 词：圆柱绕流 雷诺数 柱间距比 漩涡脱落形态 压力系数 斯特劳哈尔数 

分 类 号：TV143[水利工程—水力学及河流动力学]