[SerSe]

Hi guys,

I have a capillary pipe with two fluid phases, i.e., water at the left and right end of the pipe separated by an air gap (therefore a unique big bubble which bounds the walls) in the centre of the pipe.
My BC are mass flow inlet (just water) and pressure outlet, interior at the interfaces water/air/water and, of course, walls.
I am using the Volume of Fluid Multi-phase model to get insight into both the motion of the air gap pushed by the inlet water and the shape of the interface.
Should I turn grid adaption on, to model this problem?
and should I also provide as input in Fluent the motion of the interiors?

I made some trials with dynamic mesh but it didn't work. Moreover, dynamic mesh is used when the motion of a certain domain is known, while I don't know the motion law of the bubble.

Many thanks,

SerSe