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中文摘要：
采用Mixture模型对阶梯溢流坝气液两相湍流进行模拟，湍流模型分别采用Realizable k-ε模型和RNG k-ε模型．针对非掺气区域的坝面平均速度、边界层厚度沿水流方向的变化以及边界层内速度分布等，进行了水流特性分析，并将两种湍流模型的计算结果与实验结果进行了比较．结果表明，Realizable k-ε湍流模型能够更好地模拟出阶梯溢流坝的水流特性．
英文摘要：
The air-water two phase flow over the stepped spillway is simulated by using mixture multi- phase flow model. The Realizable/e-s turbulence model and the RNG k-ε turbulence model are chosen to enclose the controlling equations. The computational results by the two turbulence models are analyzed and compared with experimentaI ones in following aspects, mean velocity, the growth of the turbulent boundary layer thickness in the streamwise direction and the mean velocity profile normal to the pseudobottom. It is concluded from the comparison that the Realizable k-ε turbulence model is more efficient in simulating the characteristics of air-water flow over stepped spillways.
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