[Roby_1986]

Hi everybody,
I'm simulating with fluent the natural ventilation in a building, so I've realized a mesh of a cubic building with a window, which is surrounded by a parallelepiped representing the external air. I've had to refine the mesh in some zones, as those close to the building walls and to the parallelepiped basis. The mesh is that of the attached image.
I've a doubt about the near-wall treatment. First I've set k-epsilon RNG with standard wall function. Setting the Yplus of the building walls and the basis of the parallelepiped (which is considered as a rough wall) I've obtained Y+ include between about zero and a 700. Now, I don't know how to proceed, becouse I should coarsen the mesh in those zones where Y+ are less than 30 and refine the mesh whare Y+ are more than 300. Is it right?
I know that Fluent can just refine the mesh and not coarsen it. So, what can I do?
Thanks a lot.
Bests