Manuel Pacherres

Good evening
Thank you very much for the recommendation, I will investigate and try to model a condensation case.
And well regarding point number 3, yes, I am performing a conjugate heat transfer analysis, that is my goal. Regarding the meshing the only thing I did was a local curvature sizing to generate my surface mesh, and to generate my volume mesh I applied to the geometry as a whole, boundary layers with a smooth transition scheme, added to the solid regions, with growth at the solid-fluid interface. Below you can see in the images the above mentioned. Question, what condition should I add to the pipe in this case, to take into account its thickness? And the boundary layer condition to which parts of my geometry should I add it?