Additional Varialbes at the OPENING boundary
 

Hi everyone,

I am modeling a multiphase system, in which I need to introduce two Additional Varialbes (AV) for each phase (water & Air) which they would be considered as oxygen concentration in each phase...

Problem: I have an opening boundary condition at the top of my model at which, the water is freely going in/out, (of course the same water of the domain). this means that I need to set the (AV)s at the OPENING boundary in a way that no new water comes in (but the same water contating the specitic oxygen concentration shall only enter the domain...) and it's a transient settings model.

Would highly appreciate any help/comments...

Houman