With the aid of the proper original numerical model of solidification the instruction for preparation of input parameters for numerical simulation of technological processes, with change of the phase or structure, will be presented. A method of calculation analysis of influence of thermophysical properties of materials entering the system of casting-mould-cores-environment, and also of boundary conditions on the required simulation accuracy will be suggested. For the cast material, the influence of heat conductivity, specific heat capacity, density and latent heat of phase transformation also has been analysed. For metallic or non-metallic moulding material, the influence of the same main parameters has been analysed and, furthermore, their combination, influence of thermal conductivity, and of heat storage. The order of influence of all quoted parameters of a casting and moulding material was established. For example heat conductivity in the liquid state is on the last place. From the boundary conditions the most important influence on the total solidification time and on the mechanism of forming of temperature field has the boundary condition on the casting-mould boundary, then follows the boundary condition on the level of a molten metal. The negligible influence has the boundary condition on the mould frame and on the bottom.
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