Natural convection
 

hi everyone
ı am studying natural convection in a closed room. Room is heated below and cooled by window. But solition is not converged. Can you help me in this problem?
steady-state, about 1900000 node
turbulance model: Realizable k-epsilon model
matterrial of fluid : air boussinesq
Solution methods :Green-gausse node based, pressure: presto
the other parameters are second order upwind
solition controls: momentum 0.7, others are default