采用VOF法模拟自由表面，用非结构网格来处理复杂的边界形状，并根据边界形式进行适当的分区，利用k-ε气液两相流模拟光面和台阶溢流面的流场，得到了溢流面的流场、水面线以及消能率等相关水力参数。数值模拟试验结果表明，台阶溢流坝面水流紊动掺气充分，消能率较高，并与物理模型试验结果进行对比分析，二者吻合良好。

Using the VOF method to simulate free surface and unstructured grid to deal with complex boundary shape, and conducting the appropriate district based on the border form and utilizing the two phase flow of k-ε water-gas simulating the flow field of the stepped spillway and smooth spillway, the flow field, water surface profile and energy dissipation rate, and other related hydraulic parameters are gotten. The numerical simulation results show that the water flow on the stepped overflow dam face is turbulent with full aeration, the rate of energy dissipation on the steps with choosing a reasonable size is higher, and the physical model test results are analyzed. By comparison, the simulated results are in good agreement with test data, so the two-phase turbulent flow model and the VOF method used for flow simulation on stepped dam face is feasible.