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 Anisotropic Tet Meshing.

In Gridgen V15.10, we introduced a major new meshing feature making boundary layer meshing faster and easier: anisotropic tetrahedral and triangular meshing.

Anisotropic means the cells are stretched more in one direction than the other. In the boundary layer, this means you can have very small spacing perpendicular to boundaries while using large spacing in the transverse directions. This gives you the resolution you need for accurate force and heat transfer predictions without using too many grid points.

 

Stretched triangles with included right angles improve solution accuracy and solver convergence.
DLR-F6 test case:
 

Using the Anisotropic hybrid meshing technique, we have been able to go from CAD file to viscous mesh (5 Million Cells) in under three hours.  The example shown, the DLR-F6 wing, fuselage, pylon, nacelle case from the AIAA’s Drag Prediction Workshop, has anisotropic, highly-clustered cells (wall spacing 0.0006) near the body of the vehicle that smoothly expand to isotropic tetrahedra in the far field. 

 

Anisotropic tetrahedra resolve boundary layers while still giving geometric flexibility.