Eulerian twophase boundary condition for velocity inlet
I have two boundary conditions. One velocity inlet with a continous phase a velocity boundary, which is pulsating. So it's something like a sinus-function. And a dispersed phase, where the velocity it's negative, so dispersed phase can go out of the inlet. Is a volume fraction=0 a good asumption or will it lead to only entering continous phase and mass flow of dispersed phase is zero. Should I then use an assumption for volfrac (something like volfrac=holdup of column). Or also a pulsating volfrac.
The outlet is a pressure outlet, where the backflow volfrac is one. The inlet is at the top of the column and the pressure outlet at the bottom.
So it's a countercurrent pulsating flow. It's for simulation of a liquid-liquid pulsed (and stirred) extraction column. The continous phase is the heavy phase and the dispersed phase is the light phase.
Gravity is considered in the model, so also the bouyancy, right?