[Elboy]

Hi,

I'm trying to mesh a rectangular domain (3D) with STAR CCM+. It represents a volume of air with an inlet, a ground, a sky (and a building inside).

I would like to create a boundary layer over the ground to catch velocity gradients near the ground ( I put a field function for the inlet profile), however my boundary layer seems to apply on all edges while i only want the ground to be done.

How could I proceed ?

( and what type of region should I assign to the sky and sides of the domain which are juste a simple exit for the air ? )

[cwl]

Either with a Surface Control (in Parts Mesher) with Prism Layer set to disabled.
Or - what looks like real source of problem: by default meshers build prism layers at walls and do not do that at openings (inlets, outlets) and symmetry; so - assign boundary condition types first, then - mesh.