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为探索丁坝群附近水流流场,揭示其局部冲刷的形成机理,该文采用Flow-3d软件,选取RNG k-ε湍流模型和以希尔兹(Shields)数为基础的泥沙推移质输沙率模型对上挑丁坝群的周围流场分布和局部冲刷进行了三维数值模拟。研究发现,丁坝群间涡系结构复杂,第一座丁坝坝头处有一对反向的旋涡和下潜水流,切应力达到最大值,使得该位置有较大冲刷坑发生,解释了冲刷机理。冲刷坑的模拟深度和范围与实验结果吻合较好,表明该模型可以用于丁坝群及相关河道整治工程的流场和冲刷坑计算。
In order to explore the flow field near the Dingba group and reveal the formation mechanism of the local scour, a flow-3d software was used to select the RNG k-ε turbulence model and the sediment transport load based on the Shields number Rate model for three-dimensional numerical simulation of flow field distribution and local erosion around the upstream Dingxiao group. The study found that the vortex system of the complex between the dam and dam is complex. The first dam has a pair of reverse vortices and dive currents at the head of the dam. The shear stress reaches the maximum value, causing a large scouring pit to occur at this position, explaining the scouring mechanism. The simulation depth and range of the scouring pits are in good agreement with the experimental results, indicating that the model can be used to calculate the flow field and scouring pits of the dam group and related river regulation works.