[jszjvictor]

Hi everyone. I am trying to use fluent to investigate pollutant dispersion.

The pollutant is in outdoor, air blows from a certain direction. I am interested in pollutant volume fraction, and hence I use VOF.

The problem is, now I have also indoor space with one ventilator sucks in outdoor air and one ventilator blows out indoor air (with fixed velocity).

If I unite indoor and outdoor air, I am not able to define the ventilator velocity...

any suggestion? thanks!