Implicit function modeling of solidification in metal castings

Solidification of metal castings can be modeled by an implicit real-valued function whose behavior is determined by physical parameters prescribed on the boundary of a casting. We show how to construct such functions using theory of R-functions for two-dimensional castings represented by their boundaries. The parameterized form of the constructed functions is convenient for studying, controlling and optimizing their behavior in terms of the physical parameters specified on the boundary of the casting. The proposed approach call also be used for modeling multiple cavities in a same sand mold, generalizes to three-dimensional castings, and is applicable to other physical phenomena that,nay be suitable for analysis based on empirical knowledge.