中文摘要：

本文采用有限体积法，发展了适合复杂几何边界条件的可压缩流动大涡模拟程序，通过对槽道湍流的计算，验证了程序的可靠性。对低雷诺数、逆压梯度环境中的层流分离泡转捩现象进行了数值模拟，分析了其统计特性及大尺度相干结构的演化规律。初步的结果表明：大涡模拟可以很好地处理层流分离泡转捩问题，既能给出满意的统计平均结果，又可以通过相干结构的演化细致描述分离泡转捩的动力学过程。

英文摘要：

A large-eddy simulation （LES） code was developed to deal with compressible flows with complex geometry boundaries. It employed finite volume method （FVM） and was validated by the computation of turbulent channel flow. Laminar separation bubble transition under low Reynolds number and adverse pressure gradient conditions was simulated and analyzed. The statistical characteristics and instantaneous flow field, especially the evolution of large scale coherent structures were presented. Numerical results indicated that LES was capable of computing laminar separation bubble, which provided not only satisfactory statistical results, but also fine descriptions of coherent structures evolution.