Reply To: Simulating PCM using Ansys Fluent – Convergance Rate

[Rob]

Yes, thank you.  So, as the liquid fraction increases is it starting to move? In a solid you're just considering thermal conduction; once it's a liquid you can add convection and diffusion into mix. With more fluid, higher temperatures and potentially flow pathways opening up it's very possible something happens at a faster rate. Plot some velocity and solid/fluid contours to get an idea of what's going on.