[Pierluigi Tagliabue]

I everybody, I am new to this forum and to CFD in general.
I am using STAR-CCM+ and I have numerical instability problem in a project I am doing.

I think they are due to a strongly non-linear function that is given as input as a material property. I simulate phase change of a continuum assuming it is a solid and manually building the specific heat function through the equivalent heat capacity method. This is done so that I am not simulating anything of CFD actually, only thermal transport.

Does anybody know how to deal with this type of problem? Is there any way to introduce a "smoothing function" or something like this?

Thanks,

Pierluigi