In order to seek an advanced numerical simulation method to study the flow field characteristic of the river current,this article uses the VOF turbulent flow mathematical model to simulation study of fluvial channel velocity field of river stretch both before and after the Anshunchang embankment be constructed. The change situation of velocity of flow, the direction, the water level and so on are compared before and after the embankment be constructed. The simulative computation indicates that the VOF turbulent flow mathematical model is an effective method for processing complex free surface.This method not only has good stabilization, strong flexibility and high accuracy precision, but also the grid division is flexible, therefore can simulate the irregular river course boundary well, thus suits to the simulation of natural river velocity field.
