approximate model of a parabolic solar collector
 

Hello foamers,
sorry for my bad english:o
I am new to use OpenFoam.

I must construct a simply model of a transitory absorber tube of a system solar through.
In the circular tube flows pressurized CO2 (incompressible) and it is uniformly heated by a heat flux X. The flow is turbulent.
What is the best solver in this case?
I started with simpleFoam but missing the temperature.
I thought to use the solver buoyantBoussinesqPisoFoam or buoyantBoussinesqSimpleFoam.
I am beginning well?
Thank you very much for the answers