LIU Wen,HE Chang-hai,HUI Jian-wei,LIU Quan
China Rural Water and Hydropower. 2019, (2):
149-154.
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To consider the effect of partial aeration in discharge flow out of diversion outlet structure, three-dimensional numerical simulation including turbulence model, air entrainment model and drift-flux model was utilized to simulate a practical diversion project. Firstly, the CATIA software was used to build the geometric model with complex terrain that matched the real project. Then, based on RNG turbulence model, the air entrainment module and TruVOF method tracing free surface in Flow-3D software, the whole flow field of the diversion project considering partial aeration of the spillway flow was calculated, the distribution rule of water flow regime, water level, flow velocity and bottom pressure in the spillway was obtained. Compare the computing results with the results of model test, the results show that the numerical simulation had better results, and reasonability of the upstream cofferdam design elevation is verified. The numerical simulation with air entrainment module of three-dimensional flow field obtained better velocity distribution, pressure distribution, the aeration concentration, aeration range of the flow, which provides one theory and method for flow field calculation of similar river diversion project.