Abstract: In this article, three turbulent models, namely the standard κ-ε model, the renormalization κ-ε model, and the v-f 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 v-f (κ-ε-ν²) model behave best among the three models.Therefore, the v-f (κ-ε-ν²) model has the predominance in the simulation in the turbulent separated flows.