Abstract:In order to solve the problem of simulating the hydraulic characteristics of the confluence estuary of the water diversion from the Yangtze-to-Huaihe River and the well, the RNG k-ε two equation turbulent mathematical model based on VOF method is used to conduct a three-dimensional numerical simulation study on the Yangdazhuang drop project. The feasibility of this model in simulating the hydraulic characteristics of the water flow of the Yangdazhuang drop project was verified by comparing the calculation results with the completed hydraulic model test results. The research results show that through reasonable treatment of grids and calculation parameters, the numerical simulation results of the flow pattern, velocity distribution and water level of the Yangdazhuang drop into the channel are in good agreement with the experimental values, indicating that it was feasible to use this model to simulate the hydraulic characteristics of the Yangdazhuang drop project, and the mathematical model can be used to guide and solve similar engineering problems.