明渠交汇口水流及污染物输移数值计算

Numerical simulation of flow field and pollutant transport at the junction of open channel

针对明渠交汇口流动特性应用深度平均H L紊流模型和污染物传输方程建立了明渠交汇口水流流动及污染物输移模型;采用有限体积法离散格式及交错网格上的水深-速度校正算法进行了数值计算并应用实测资料对数值模型进行了验证。计算结果与实测资料吻合较好,表明所提出的模型能较好的预测交汇口水流分离区及污染混合区形状及大小。

The modified depthaveraged HanjalicLaunder model for turbulent flow and pollutant transport equation are applied to establish the model for numerical simulation of flow field and pollutant transportation at the open channel junction.The governing equations are discretized on staggered grids by finite volume method and solved by the SIMPLE algorithm.Based on the method of water depthvelocity correction,the 'rigid lid'approximation is discarded.The validity of the model is verified by experimental data.The model can well describe the flow in recirculation zone and distribution of scalar quantity.