[user9]

I am trying to simulate air water non boiling slug flow in a 2d axisymetric domain. heat flux is also applied. basically i should use vof but due to computational expenses i am using eulerian model and mixture model. but i m facing the problem of convergence as well as slug flow is not forming.Screenshot (71).jpg.
my contours are contours of vf of air.jpg


can someone tell me whether i should use implicit/ explicit scheme for volume fraction.
what should be my backflow conditions in pressure outlet.
any further advise is welcomed.

thnks