have you checked the solidworks knowledgebase at customerportal.solidworks.com? there is actually a couple articles on setting up this problem.
build your closed loop system and use an internal fan to do this.
work on steady state before you move to time dependent.
Dear Jared Conway,
Thanx for breaking the ice,
I was really expecting to hv some reply from your side,,
as when i looked into the forum,, i found u a really active TEACHER,
thanks once again for ur tip.
so, ok, let me follow ur suggestion
but plz, i will be back to u,, if i didnt get the way.
hope for ur better cooperations.