Ansys Fluent Tutorial | Melting
Written by cfd.ninja
Melting is modelled with the solidification and melting approach, which does not track the solid and liquid as separate phases. Each cell carries a liquid fraction, and the phase change appears through the latent heat released or absorbed as that fraction moves between zero and one.
The mushy zone is the region in between, where the material is partly solid. Its resistance to flow is controlled by a numerical constant that damps the velocity as the cell solidifies, and that constant has a real effect on how the front advances.
Two settings decide whether the case behaves: the time step, since the interface should not cross several cells per step, and the mesh near the moving front, which has to be fine enough to resolve the gradient in liquid fraction rather than smear it.
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