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Hello I am trying to simulate a 3Dsimulation of melting a 30x30x30mm^3 basalt rock in a TE mode microve cavity. Using multiphysics of RF microwave and Heat transfer in solids. I am taking in to consideration convective heat transfer and radiation from the borders of the rock to the air in the cavity. I want to consider the melting of the material so i tryed two ways. * First i defined peicewzie properties for the basalt parameters. before melting temperature and after. I enqaunterd two problems. The first was a convergion problem, when the temperature reaches the melting temperature i see in the segragated solver that the error reaches infinit values, the second is that in the results i see very high temperatures. * I simulated phase change, using another material for the temperature above melting temperature defining a peicewize propetry for each material. The simulation chonverges but the results are not physical. I have tryed to find answers in the forum but didnt see a referense for a 3D simulation. I am strugelling with this problem for several months now. can someone please help me i would very appreciate it. yoav