5th International Conference on Advances in Solidification Processes (ICASP-5) 5th International Symposium on Cutting Edge of Computer Simulation of Solidification, Casting and Refining (CSSCR-5)

The modelling of solidification processes in combination with fluid flow is one application of ANSYS Fluent. The solidification is modelled with the enthalpy porosity technique. Therefore, the fluid flow is damped similar to a flow through a porous media of dendrites. For the numerical simulation of remelting processes like electro slag remelting or vacuum arc remelting ANSYS Fluent is used due to the fast solvers and large implementation possibilities. In case of materials with large solidification ranges, like alloy 718, the built-in adjustment possibilities of ANSYS Fluent are often not adequate. The program postulates a simple dependency between liquid fraction and solidification enthalpy. To improve the simulation, the solidification was implemented by a user defined function (UDF). The principal modelling of fluid flow is based on the theory of ANSYS Fluent, but it is now possible to adjust the solidification enthalpy for each temperature exactly.