In my opinion the software uses more than one volume control for the interface thickness when we should use less than one volume for the problem to be conservative.
Surface tension plays a significant role in determining the interface hence try to figure out how surface tension can vary with respect to temperature and write a UDF in FLUENT to get the results
It depends on what method the software uses to deal with the interface. There are different "Direct Numerical Simulation" methods in which the thickness of the interface varies. On the other hand, the software might use models to deal with the interface.
Does the solid-liquid interface changes shape with time in your case? is it a deformable solid or could you use rigid solid boy motion?
Solid-liquid interface changes with time. Are several flow pattern Jean...
Surface tension between the fluids can be incorporated.
In addition, contact angles between the fluids and the walls can also be specified.
https://youtu.be/QgQTaXuPmbI
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