I’m trying to study a two-phase flow problem where, at the source, I have a quantity x of the mass flow as vapor. From what I understand, the “fixed composition value” “X” can help define this, but in my code, if I apply 0.95 (95% of my flow as fluid), I get the following error:

The boundary mass fractions in the “WaterIF97” medium in the “boundary_pT” model do not add up to 1 : The sum of the mass fractions of the medium “WaterIF97” in the model “Boundary_pT” does not equal 1. Instead, sum(X_boundary) = 0.95: X_boundary[1] = 0.95 “water”

I tried looking for examples with the same question but couldn’t find anything.

Is there a way to define such a boundary condition with steam and liquid water?