I have a very simple model that I am able to mesh using tetra and hex cells. The problem appears when I am trying to generate viscous layers. For tetra cells everything works fine, not for hexa.
Mesh_1 (with the correct blocking structure for the hex meshing) meshes correctly but nevertheless the boundary layer has issues. (same as my other post)
Mesh_2 (with what looks like the blocking done by samarul) meshes corretly but neverthless the boundary layes has issues (not exactly the same errors as him)