Simulation diverged after 1%

Am trying to simulate the air flow in a room. A bit of context: I have a room which has a relatively higher than usual ceiling height. I designed the room using fusion 360 (being the only cad 3D design I know how to use). I saved the file in stl format which i imported in simscale.

simulation: Heat convective heat transfer

Boundary conditions:
2 exterior walls (facing the street) with ( heat transfer coefficient = 0.4, and temperature = 30 c)
2 interior walls + ceiling+ floor with (adiabatic temp.)
1 wall (window) with ( heat transfer coefficient =2, and temperature = 30 c)
1 velocity inlet (AC) with (x =3.33, y=-3.33, z=0)
1 pressure outlet with (10 pa)

Mesh: with 3 finess, also tried 5 finess with no luck


Hi @amidher, thanks for posting on the forum and welcome to the SimScale Community :handshake:

Could you kindly attach a projet link for us to take a closer look? However, from the information you’ve provided, I think it’s worth noticing that you should avoid STL files as much as possible when it comes to simulation - specially with solvers other than PWC, LBM and CHT (IBM).

Also, please check out these two resources as they are always valuable when facing convergence issues:

Best,
Igor