The properties of castings arise during the solidification and cooling. These are influenced by numerous metallurgical and process technical factors at different levels of scale. During the simulation, the essential physical and chemical phenomena are mapped and numerically modelled. The model construction proceeds at the macroscopic, mesoscopic and microscopic levels of scale which are appropriately coupled together. In this way, several effects can be taken into account: such as nucleation, diffusion and dendrite arm coarsening as well as redistribution, the sedimentation and accumulation of grains and the shrinkage-driven convection. Thus, for example, local properties should be computed from the grain structure which further increases the model’s forecasting reliability and enables quantitative results to be provided for different applications.