Liquid/ Gas flow with VOF
 

In the multiphase option of fluent with VOF method it is possible to define primary phase (e.g. gas) as ideal gas and secondary phase (tracked phase e.g. liquid) as incompressible,

What is the fluent's model for this? what is method of cupling between this two model (incompressible and probably compressible) it is especially confusing for interfaces cell. If anyone have information about this or knowe the refrence of it, please give me guide.

with Regard.