Solar chimney cfd
 

Hello I have some questions about a solar chimney cfd analysis.
how can I calculate the Re in a shape like that in order to get the Yplus values for inflation.
Is it better to use k-e model with Yplus around 50 or sst with near wall modelling yplus around 1?
I want to enter the equations of heat transfer in the collector ground and air. Is there a guide to follow for this?
For the mesh independence study I have to refine the whole mesh or just the region that I am interested in i.e. the transaction area?

Every answer is appreciated