Hi all,

I am a beginner in CFD, anyway, I am having problem as in the mentioned subject.

I am trying to simulate an indoor air flow condition for a lecture room.

From the plan I have, I obtained all locations for both supply and return ducts.

The capacity for both of them are listed in cubic feet per minute (cfm), I already converted them to meter cube per sec.

For the Supply ducts, I can obtained the capacity easily, Area X Inlet Speed = meter cube per sec.

But I am having problem with the Return ducts, most of the boundary conditions require the temperature, which I do not have.

So, to recap my question, Which type of Boundary Conditions should I specified for Return Air ducts? Information I have, capacity and size of each return air ducts.

Thanks for ur time.

Keng

you can give the velocity of return air