[a_habib]

Hello foamers
I'm trying to simulate a non-isothermal flow in a room.
Using buoyantBoussinesqSimpleFoam, I created three meshes and used kEpsilon, kOmegaSST, RSM on these meshes, but I've got confusing results.

- Using the coarse mesh, the simulation overestimated the temperature profiles compared to an experimental results recorded in several locoation in the domain, even after reducing the relaxationFactors.

- Using the medium mesh, the results had a good agreement with the experimental results .

- BUT when I used the fine mesh, the simulation underestimated the temperature profiles even after reducing the residualsControls.

The average relative errors using kEpsilon are (24.7% for coarse mesh, 6.34% for medium mesh and 18.8% for the fine mesh)

I 've got the same behavior using the three turbulence models mentioned above, you can see an example in the attachment picture

I've tried to find an explanation to this results, but I came up empty handed, so if any one can help I'll appreciate that very much.

Regads.