Abstract: The simplified algebraic stress model is successfully introduced into commercial CFD PHOENICS software. Meanwhile, the conserved scale method and the Van Leer scheme are used to determine the morphology of free surface. In order to overcome the disadvantage of small time step in numerical simulation, two different time steps are adopted to calculate velocity field and to determine free surface morphology respectively. The results show that these measures enhance the computation speed greetly, and the obtained accuracy can fulfil the demand of engineer application. It is also shown that the results of numerical simulation based on K model are quite different from experimemtal ones.

Key words: Conserved scale method, Free surface, Simplified algebraic stress model, Time step