Investment casting simulation is achieved using simulation software ADSTEFAN. Figure shows the simulation of investment casting of a nozzle. Figure shows the temperature distribution in liquid metal after cavity filling, and the progress of solidification pattern, predicted by investment casting simulation. Using simulation technique, the defects were predicted (specifically, air entrapment, shrinkage porosity in this case study). Gating design was iteratively changed using casting simulation for gating system optimisation. At ProSIM we have worked on many such projects of investment casting.