The parametrisation of geometrical stereolithography CAD files
is investigated within the discretisation of the full Navier-Stokes equations. The
geometry is blended into hexa shaped mesh via a collision approach of convex
sets. All parts that comprise the geometry are treated individually and the finite
volumes in the mesh are tagged based on the collision between the geometry
and the mesh. The volume and areas of the computational cells are amended
following a pre-stablished porosity value. The turbulent flow is solved in the mesh
using RANS (Reynolds Averaged Navier Stokes) approach and the turbulence
problem is closed by the Boussinesq formulation solving two additional equations
for turbulent kinetic energy and its respective rate of dissipation. Comparison
with experimental data for the classical step case presented good agreement.