fluent air flow and co2 mix species transport BC cabin
 

hello every body,,,,
i need your help,
i'm trying to conduct a simple process
air enter a cabin with 0.085% co2 (mixed)as 1st velocity inlet BC at 294k
passengers mouth exhaled 100%c02 with 2nd velocity inlet BC
species transport equation will be activated.....co2 mass fraction 0.00018
no reaction ------- how to choose co2 from species window list?
i need the curve of tracer gas decay (age of air)
and co2 concentration curve and above all how to make first BC steps in fluent solver.
ansys code 14 , win7 , 32bit
best regards.