[richard2000]

I am doing a melting/solidification model using homogeneous binary mixture in CFX. I specified the material specific reference enthalpy per the latent heat and the momentum source in terms of Darcy equation for porous media as a function of velocity and mass fraction. The results I got always show a very low flow velocity on the order of about 1mm/s rather than about 100 mm/s in reality. I tried different momentum source terms or even nothing at all, and the flow velocity increases slightly but still on the order of mm/s. I have found papers using similar models although no details are inclded. What could I have done wong? I have been struggling with this for a long time. Your help is highly appreciated!

Best regards,

Richard