The Numerical Simulation Of Flow Field In Water Cushion Pool Downstream The High Arch Dam

The numerical simulation was made to the flow field of the anti-arch plunge pool and the flat one based on the Xi Luodu arch dam by applying 2-d and 3-d RNG k-ε turbulence model.The 2-d numerical simulation computed the free surface with VOF method, while the 3-d numerical simulation applied the rigid surface.The 2-d numerical research gives the whole process of the flow movement which includes jet going from the exit or impacting in air, then into the plunge pool and developing to the flow stabilization, and gives the velocity vectorgraph, the wall pressure distribution and the fluctuating process of top wall pressure and the maximal flow velocity near the wall.The 3-d numerical research gives the velocity vectorgraph and streamline on different vertical sections, transects and horizontal sections in the two kinds of plunge pool, the vertical and longitudinal distribution of velocity and the solid drawing of pressure distribution on the wall, and the calculated results have a good agreement with the experiment from Xi Luodu, so the results is reliable. The text also compared the calculate results of the arch invert plunge pool with that of the flat-bottom one detailedly, It shows that the flow station and the pressure distribution on the wall of the anti-arch plunge pool are better than that of the flat-bottom plunge pool in the jet-entering area, while the flow station and the pressure distribution on the wall of the flat-bottom are better upstream and downstream the jet-entering area. The research provides an reference for the design and engineering, and has a very important signification.