||June 9, 2009 12:30
Vof oulet bc with gravity
I was running a problem using VOF with gravity turned on (interFoam and rasInterFoam). Using the damBreak case as an example, if the gravity is reversed, the liquid is supposed to flow out of the top boundary (atmosphere). Using the default boundary settings (pressureInletOuletVelocity for U and totalPressure for pd). I found that a good portion of the liquid was bounced back to the domain. However, if the gravity was turned off at some point in time (say, 0.2 s), the liquid will flow out of the domain naturally. In contrast, Fluent can handle this pretty well with pressure outlet bc. I tried several different combinations of BCs for U and pd, but without luck. Does anyone have a solution for this or knows what's going on with OpenFOAM's VOF BC implementation?