Abstract

In this paper, three methods applied in dealing with pier column group influence to the flow in the two-dimensional flow numerical model are compared, analyzed and verified with computation results. The analyses and calculations demonstrate that refined mesh method is adaptable to the pier column group with large size, small number and regular shape, and if the wall side law is brought into the calculation the result will be more reasonable. Additional roughness method and additional resistance one are adaptable to the pier column group with small size, little number and complex shape. In the region covered by pier column group, the longitudinal velocity calculated by refined mesh method is less than the one gained by other methods and as regards the lateral velocity the result is counter.

Keywords: two-dimensional flow numerical model, pier column group, refined mesh method, additional roughness method, additional resistance method