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Treating Free Surfaces or Flow Field in Numerical Method

Ma Fuxi;Wang Kekiu;Wang Jinrui  
To solve the problems of irregular boundaries and free surfaces in predicting three dimensional anisotropic turbulent flow,a modified K-B turbulence model is derived, and the governing equations of turbulent flow over irregular boundary are developed by analyzing the scud-liquid two-phase theoretical flow model. And furthermore a partial-cell Parameter is introduced to treat irregular boundary, which allows curved boundaries and internal obstacles or islands. To track free surfaces, a simple but powerful method is described that is based on the concept of a fractional volume of fluid (VOF). This method is shown to be efficient to track complicated free surfaces. Two examples of which one is the flow over spillway and its down stream bucked type energy dissipation flow and another is a three dimensional hydraulic jump in converging stilling basin have been simulated and compared with experimental results. It shows that the program established has a wide range of application. It can simulate almost all kinds of turbulent flow with free surfaces in hydraulic engineering.
【CateGory Index】: O357.4
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