Reply To: Reversed flows after switching inlet boundary conditions

[Rob]

OK, think through what's happening. 

The massflow inlet pushes mass into the domain at a fixed rate. As the pressure increases I would assume the velocity on the boundary drops. The tank pressure increases and something happens to move free gas into the absorpant material: is that a UDF? Setting a pressure inlet will mean the system reaches an equilibrium with outside at some point. But.... what is stopping the absorbed gas being released?