[iamalwaysconfused]

Hi!

I am using Ansys fluent to monitor the decay rate of CO2 in a room, this is a transient simulation and I'm starting with an initial uniform concentration of CO2 in the room. It's a simple domain with a door and exhaust fan. Door the inlet, and exhaust the outlet.

First of all I put ambient level of CO2 at boundaries.

And when we initialize the solution, I entered the initial concentration of CO2 there. After initializing, I patched the exact value again.

Now, at inlet I understand it would be ambient (the species concentration) but I put exhaust as velocity inlet, as there wasn't a velocity outlet option because I know the velocity of exhaust fan. Maybe that's why it's asking me to input the CO2 concentration there also.

After putting CO2 concentration as ambient level at door and exhaust fan, I still couldn't match the plot I got with the experimental plot.

I need help with the boundaries part and whether I need to use a definite parameter for exhuast fan