中文摘要：

本文采用大涡模拟方法，对不同间距下并列圆柱绕流进行了数值模拟。计算雷诺数为3900，两圆柱中心之间的距离与直径之比分别为2、3、4和10。研究结果表明：随着间距的增大，回流区长度增加，圆柱中心线处与主流区的速度梯度以及中心线附近的雷诺应力逐渐减小，不同圆柱脱落涡之间的相互干涉也随之减弱。

英文摘要：

Flow around side-by-side circular cylinders at various spacing was numerically calculated by using the large eddy simulation method in this paper. The Reynolds number is 3900 and the ratio of center-to-center distance to diameter is 2, 3, 4 and 10 respectively. Research results of the study show that, with the growing of the ratio, the length of the recirculation increases. Both the velocity gradient from cylinder center line to main stream and Reynolds stress near the center line reduced gradually. The mutual interference of shedding vortex between two cylinders subsequently weakened.