The problem that I am dealing with is related to simulating multiphase melting and re-solidification of a moving body using ANSYS Fluent.
The physical problem is a solid slab which is moving at a constant speed and is heated locally above its melting point with a stationary heat source. The heat source is applied by defining an energy source term at the material-air interface. I used the VOF model to free surface deformations of the molten region. Figure 1 shows a similar problem simulated in other software by others.
To numerically model this problem in ANSYS Fluent, I made a case and employed the “velocity inlet” boundary condition at the inlet to determine the slab and air velocities and an “outflow” boundary condition at the outlet. However, after running the simulation I found that the solidified region close to the boundaries moves and deforms, which is physically unrealistic (see figure 2).
Any heads up, or hints on how to model this problem in ANSYS Fluent using a moving reference frame (i.e. without modelling the source-term movement explicitly) are highly appreciated.