As mentioned in Section
24.1.1, the formulation in
FLUENT can be used to model the solidification/melting of pure materials, as well as alloys. The liquid fraction versus temperature relationship used in
FLUENT is the lever rule
; i.e., a linear relationship (Equation
24.2-3). Other relationships are possible [
361], but are not currently available in
The following limitations apply to the solidification/melting model in
The solidification/melting model can be used only with the pressure-based solver; it is not available with the density-based solvers.
The solidification/melting model cannot be used for compressible flows.
Of the general multiphase models (VOF, mixture, and Eulerian), only the VOF model can be used with the solidification/melting model.
With the exception of species diffusivities, you cannot specify material properties separately for the solid and liquid materials.
When using the solidification/melting model in conjunction with modeling species transport with reactions, there is no mechanism to restrict the reactions to only the liquid region; i.e., the reactions are solved everywhere.