中文摘要：

本文对非结构网格中U—RANS／PDF混合方法的并行计算进行了研究，通过对方柱绕流的数值模拟，讨论了并行程序的有效性和计算效率。非结构网格上U—RANS／PDF混合方法的并行计算，提高了PDF方法的计算效率和处理复杂几何结构的能力，使得PDF方法能够方便地应用于实际燃烧问题。

英文摘要：

In this paper, a parallel implementation of a hybrid U-RANS/PDF method on unstructured mesh was presented. A flow past a square cylinder was studied to test the code and to estimate the parallel performance. Parallel computation is an effective way to overcome the high computer time and storage limitations associated with the Monte Carlo solution of PDF equation, and the ability to perform the computations on unstructured meshes allows representation of complex geometries of practical turbulent reactive flows with relative ease.