Can you tell if you considered the occupant's mouth as an inlet? If not, how did you assign SF6=1 at the mouth?  How did you model the occupant (a solid domain or a fluid domain)?

Which "mixture material"  and "turbulent-chemistry interaction" have you selected? I can see that you have air+SF6

Can you share the name of the paper that you have mentioned in your question? I can read it and probably comment on your questions.


Thank You