stack effect - natural ventilation - buoyancy
 

Hello,

We are a private non-profit technological center.

We are looking for a CFD software to model the natural mouvement of the air in buildings, considering the buoyancy force (buoyancy occurs due to a difference in indoor-to-outdoor air density resulting from temperature and moisture differences) coupled with mechanical ventilation and the radiation effect (the surface of the building is at different temperatures, depending on its orientation).

We've got ANSYS Mechanical, but not the CFX module (20-25 K€) which, I think, could do this. We are looking for a cheaper solution, could you give me some ideas ?

Thanks you a lot. Segis