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SRP,

thank you for your reply.

This is the boundary conditions at the inlet. There is only one inlet.

The boundary conditions in this case are too simple to get some hint..

And, I don't think the boundary conditions caused this problem, because if the boundary conditions for CH4 were the issue, the contour of volume fraction should also reflect those things. However, it seems that it does not.

This is the contours of volume fraction of phase-2 (gas mixture) and mass fractions of CH4 and N2 after more calculations.

Â

In your second suggestion, what is going to be the meaning of the mass fractions ofÂ CH4 and N2 in this case?

When VOF model is used, both phases share all the pressure, density, velocity, and so on.

Then, when I want to calculate and monitor, for example, the total mass of CH4 introduced into the domain, what is going to be the right formula?

In my problem, the mass fraction of CH4 at some cells occupied by liquid metal is given by one. Then, at those cells, the mass fraction of CH4 is going to be multiplied by the mass of liquid metal, which does not make sense.

Anyway I am going to monitor some variables related with the mass fractions, and will post it later.

Thank you for your suggestions, SRP. Any other replies will be highly helpful and appreciated.