Numerical Simulation Of Level Swirling Flow Of Inner Energy Dissipation Discharge Tunnel

The high dam sluices in the building possesses the characteristics of high water head and heavy discharge at present. The patterns of flood discharge and energy dissipation are mostly using energy dissipator. As one of the pattern, level rotary inner energy dissipator, which was investigated in experiments in the past, has not been reported with numerical simulation.Author firstly comprehends and masters the concept of each hydraulic characteristic by analysing the model test results in this thesis. Then author investigates the effect and the feasibility of the mesh generation method, the turbulence model, and reasonable boundary conditions and numerical dissipation of level rotary inner energy dissipater with the numerical simulation technique and large universal calculation software.Author gets the hydraulic parameters of rotational flow, simulats and reconstructs the model test results using the Realizable k -εturbulence model and free surface tracing technology VOF method.(1) Author validates the numerical simulation results based on the wall pressure acquired in the experiments, investigates the pressure distribution in horizontal holes and pressure gradient along porous.(2) Author gets the distribution that flow is semi-free vortex and the swirl angle changed along the path by calculating and analysing the axial, tangential and radial speed of flow moment in horizontal holes.(3) Author verifies the level rotary flow with high rate of energy loss and proves that its advantages as a new energy dissipator further calculateing and analysing the turbulent energy and dissipation rate along porous.(4) Author compared with wall pressure of different turbulence model, swirl angle and dissipation rate with different turbulence model combining with the experimental study, and comes to the conclusion that Realizable k -εturbulence model was more suitable for simulating this energy dissipator.