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针对明渠交汇口缓流流动特性,分别应用水深平均H-L模型及k-ε模型建立了二维数值模型.水深方向采用静压假定,可模拟自由面和河床地形变化;应用交错网格上的有限体积法对方程组进行离散并采用水深速度校正算法求解;每个代数方程求解采用TDMA逐行扫描法;针对交汇口几何特征,分区进行网格划分.应用实测资料对两种模型进行了验证比较,结果表明两种模型均可模拟明渠交汇口基本流动特性,但H-L模型所得的分离区计算结果比k-ε模型更为准确.
According to the flow characteristics of slow flow at the confluence of open channel, a two-dimensional numerical model is established by using water depth average HL model and k-ε model respectively. The static pressure hypothesis in depth direction can simulate the change of free surface and river bed topography. The volume method is used to discretize the equations and the water depth velocity correction algorithm is used to solve each algebraic equation using TDMA progressive scan method.According to the geometric characteristics of the junction and the meshing of the zoning, the two models are validated and compared The results show that both models can simulate the basic flow characteristics of open channel intersections, but the results obtained by the HL model are more accurate than the k-ε model.