中文摘要：

利用标准模型κ-ε、重整群κ-ε模型和v2f三种不同的紊流模型,在同位网格系统基础上,采用了有限控制体积离散方程,数值模拟了底坎所形成紊流分离流。计算结果表明,所选用的3种模型虽大致都能模拟出底坎分离流的流动特性,如前后角涡、回流型态等,但在主涡心位置、回流长度、水头损失和流速分布等方面3种模型计算结果有所差异,其中v2f模型所计算的结果同试验和大涡模拟的结果值更趋一致。结果表明,v2f模型具有更精确模拟底坎所形成的紊流分离流方面的优势。

英文摘要：

In this article, three turbulent models, namely the standard κ-ε model, the renormalization κ-ε model, and the v2f model, are adopted to calculate the turbulent separated flow passing on sill, based on the co-located grid system and the volume method. The results show that the three models can simulate the characteristics of the turbulent separated flow passing on sill, such as the front vortex and back vortex, the pattern of back flow, etc, but there are different in the profiles of velocity, the location of the vortex behind the sill, the length of back flow and the head loss among the models. Compared with the experimental data, the results of LES indicate that the results simulated by the v2f （ κ-ε-ν^2） model behave best among the three models. Therefore, the v2f （κ-ε-ν^2） model has the predominance in the simulation in the turbulent separated flows.