Two-Dimensional Turbulent-Flow Numerical Modeling In No-pressure Tunnel Of High Water Reservoir

Finite Volume Method is appilied in numerical modeling of the flow in no-pressure tunnel of high water reservoir in this paper. I select standard k- εturbulence modeling that put forward by Launder and Spalding in 1972 by weighted poly-turbulence modeling.The difficulty is that there is free surface in flow , but free surface problem's calculating region is indefinitely. In this paper this problem is calculated by using Finite Volume Method that prouduce though Finite Difference Method and Finite Element Method, and obtained the velocity and pressure distribution, through the compare between numerical result and model experiment result, there is very good inosculation. Stsggered grid system is used in derivation of discretized equations and Alternating Direction Implicit Method is appilied in equations's caculation in the paper.In order to ensure stability and accuracy of numerical calculation,I adopt Semi-Implicit Method for Pressure-Linked Equations that is very popular so far. In order to quicken styptic v elocity,under-relaxation a nd source term linearization is appilied. At the same time, special boundary conditions are deait with.