The procedure for setting up a solidification/melting problem is described below. (Note that this procedure includes only those steps necessary for the solidification/melting model itself; you will need to set up other models, boundary conditions, etc. as usual.)
Define Models Solidification & Melting...
FLUENT will automatically enable the energy equation, so you do not have to visit the Energy panel before turning on the solidification/melting model.
Values between and are recommended for most computations. The higher the value of the Mushy Zone Constant, the steeper the damping curve becomes, and the faster the velocity drops to zero as the material solidifies. Very large values may cause the solution to oscillate as control volumes alternately solidify and melt with minor perturbations in liquid volume fraction.
| It is not necessary to have
FLUENT compute the pull velocities. See Section
24.3.2 for information about other approaches.
The default value of 1 for the Flow Iterations Per Pull Velocity Iteration indicates that the pull velocity equations will be solved after each iteration of the solver. If you increase this value, the pull velocity equations will be solved less frequently. You may want to increase the number of Flow Iterations Per Pull Velocity Iteration if the liquid fraction equation is almost converged (i.e., the position of the liquid-solid interface is not changing very much). This will speed up the calculation, although the residuals may jump when the pull velocities are updated.
If you are solving for species transport, you will also have to specify the Melting Temperature of pure solvent ( in Equations 24.2-5 and 24.2-6). The solvent is the last species material of the mixture material. For each solute, you will have to specify the slope of the liquidus surface ( Slope of Liquidus Line) with respect to the concentration of the solute ( in Equations 24.2-5 and 24.2-6), the Partition Coefficient ( ), and the rate of Diffusion in Solid. It is not necessary to specify and for the solvent.
Define Boundary Conditions...
In addition to the usual boundary conditions, consider the following:
Section 24.3.2 contains additional information about modeling continuous casting. See Sections 24.3.3 and 24.3.4 for information about solving a solidification/melting model and postprocessing the results.