Heat transfer convergence problem

kam

Hi,

I am trying to simulate buoyancy driven natural convection problem. The domain is closed, containing a room and corridor connected via door. The heat is generated by a separate heat source zone in the room. The simulation is transient. I am using the ideal-gas for density and the rest of air properties are kept constant. I am trying for months to have convergence and still not achieved. I would be really grateful for any tips regarding the above.

Many thanks, Kam