The boundary layer mesh (prisms / hexas) is automatically adjusted via motion of its layers in order to meet specified wall resolution requirements. The wall criteria include the y⁺ values, a specified thickness of the first layer, etc. Grid quality is enforced during the mesh movement.

The mesh in the wall regions adjusts the position of its layers based on the y⁺ values calculated on the aircraft surface. Notice the boundary layer mesh for the nose of the aircraft before and after the redistribution. The initial mesh produced a y⁺ value much higher than the desired value. After redistributing the mesh, the final y⁺ value was lowered to near the goal.