A three-dimensional computer program which is employed for modeling of fluid flow and heat transfer during mold filling and subsequent solidification of casting has been developed under Windows95/98 environment by using SOLA-VOF algorithm. A whole range iteration method for pressure field and speed field calculation was proposed. Therefore

the filling process simulation was improved

and the computing time was shortened effectively. The mold filling process of the benchmark test casting and some other practical examples were simulated

and the simulation results show a good agreement with the experiment results. The applications indicate that the optimal design of casting technology for assuring casting soundness can be achieved.