| A computational method, which is based on a modified SMAC method, has been developed to analyze three dimensional incompressible viscous flow in mold filling. A marker transport technique was used for the purpose of tracing three-dimensional melt free surfaces, and a marker generation method was adapted to treat an arbitrary number of inlet or outlet boundary conditions for the design of gating systems. In order to enhance the solution accuracy, the convective terms were treated by the hybrid scheme. Simulations were carried out on two types of stepped plate die casting and a three-spoke wheel gravity casting, in order to analyze the filling sequence and to predict cold shut or entrapment of air. Computational results on the two types of stepped plate casting were in good agreements with those of water model experiments. |
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