Modern developments in computer technology and computer software have allowed simulation of very complex physical phenomena, which was almost impossible or prohibitively expensive even several years ago. One such area is fluid flow involving heat transfer and coupled with phase transformation. The problem is very difficult as it sounds, but nowadays one can obtain very good results even on a personal computer within a reasonable period of time. The manufacturing process that belongs to this

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... p of problems is metalcasting. In the past, metalcasting was more of an art than the science; however, nowadays computer software is successfully applied to simulate filling and solidification process. The accurate result of simulation allow improved casting design along with the optimization of the gating and risering system used to produce a sound product.