| Three dimension and turbulent are common characteristic of sluice structures and added free surface for the best familiar spillway tunnel. In view of the curved free surface, complicated boundary, it's very difficult to simulate the flow of spillway tunnel. A comprehensive review and expectation about researching status and development trends of spillway tunnel are given in this paper. Numerical simulation is one of effective methods to study spillway tunnel. But there are two different models for pressure part and free-flow part of spillway tunnel.Based from Navier-Stokes equations, the volume of fluid (VOF) method is introduced to the k-ε turbulence model and combined with the geometry reconstruction scheme to solve the free surface. The 3D turbulent model that can simulate the 3-D turbulent flow of pressure part and free-flow part of spillway tunnel is established in the paper. Discharge capacity and the distribution of velocity, pressure, turbulence kinetic energy and turbulence dissipation rate are obtained by simulation. The numerical simulation results are compared with test results, and they are agreed well with each other.The 3D turbulent model established in the paper is comparatively well and truly simulates 3D flow in spillway tunnel. Series spillway tunnel computation can be completed aim at different type of gate slot, which will supplies reliable analysis data for design of spillway tunnel.
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