Dear, All I'm studing about natural ventilation in a building. My domain is 2 Dimentional building and the source was set on the attic. After running the result is seem not reasonable. The velocity is very high but streamline is ok. The temperature contours is not reasonable too. It's hot at the other area except on the attic. I think it has to have something wrong but I have really no idea how to fix this problem. Could anybody who has an experience give me some suggestion pls.

Thank you very much. Polly

Do you have gravity set in the proper direction so that bouyancy effects are seen?

Ryan

Thank you for your suggestion Ryan, and I have set gravity effect in -y direction. May be the boundary conditions are wrong. Could anybody give me some suggestion about the boundary conditions setting on domain pls.

Thanks before

Polly