中文摘要：

本文采用大涡模拟（LES）方法，对低雷诺数条件下周期性尾迹／层流分离泡的相互作用进行了数值模拟。计算域入口尾迹采用独立计算的平面尾迹流给出。对周期性尾迹作用下的层流分离泡进行了统计特性及瞬态流场分析，并与相同条件下的无尾迹流动进行比较。计算结果表明：在尾迹作用下，时均层流分离泡长度明显缩短，分离泡变小；相位平均的分离点／再附点随时间不断变化；从瞬态结果容易看出，尾迹诱导的流向涡结构是导致分离泡提前转捩的主要原因。

英文摘要：

A large-eddy simulation （LES） code is employed to investigate periodic wake/laminar separation bubble interaction under low Reynolds number conditions. The inflow wake is generated from a separate computation of a temporally decaying plane wake. Statistical characteristics and instantaneous flow field are presented and compared with uniform inflow results. Under periodic wake conditions, the time-mean length of separation bubble is nearly one half of the uniform inflow conditions. The phase-averaged positions of separation/reattachment points vary with time, especially for the reattachment point. From instantaneous flow field, it seems that the streamwise vortices induced by upstream wakes are the primary reason of earlier transition of separation bubble.