Abstract: Three dimensional flow fields around bridge piers are simulated accurately by using VOF method and standard model.Factors affecting blocking water of piers including width of bridge piers,numbers of bridge piers,angle of axis of bridge pier and flow direction,angles between axis of bridge and flow direction and arrangement form of bridge piers reacting on blocking water height are analyzed in this paper.Analysis shows that VOF model can be used to track the free surface flow and applicable to numerical simu...