桥梁河道三维水力与泥沙数值模型计算研究

从水动力和泥沙运动方程出发,采用雷诺时均的N-S方程,以k-ε双方程模型对紊流方程进行封闭,采用垂向分层的方法建立桥梁墩台冲刷的三维水动力模型。泥沙计算考虑悬移质和推移质泥沙输运,通过求解动网格方程更新整个计算域的网格坐标。通过数值模拟结果与模型试验结果的比较,建立的桥梁墩台冲刷数值模型具有较高的精度。

A Study on Three Dimensional Hydraulic and Sediment Numerical Model Calculation for Bridge River

Based on hydrodynamic force and sediment motion equation,the equations for the turbulent flow are governed by the Reynolds Averaged Naiver-Stokes(RANS) equations along with a two-equation turbulent closure.The method of vertical stratification is also used to construct the three-dimensional model.Both suspended load and bed load are included in the scour model.The nodal points of the mesh are updated after every time step by solving mesh moving equations.The numerical results of the model are compared with the data from engineering projects and experiments.Good agreement is obtained.