pressure outlet boundary condition
 

hi;
i have a multiphase flow model and using with VOF, sst model.
in this model inlet boundary condition is pressure inlet.
outlet boundary is defined pressure outlet, but i don't know pressure value in outlet boundary condition,
know i need help, pressure value in outlet boundary condition is important?
or can change outlet boundary condition to another type?
please guide me.
thanks.

Can you describe the problem in detail?