Ansys Meshing - Hexahedral Mesh
Written by cfd.ninja
A hexahedral mesh pays off twice in CFD: it needs fewer cells than tetrahedra for the same resolution, and its faces can be aligned with the flow, which reduces numerical diffusion and usually improves convergence.
The catch is that hexahedra require a sweepable geometry. The volume must have a source face and a target face with a compatible topology, so in practice you slice the model into sweepable blocks first, using freeze and boolean operations in DesignModeler or SpaceClaim.
When slicing by hand is not worth the effort, MultiZone does the decomposition automatically and fills what it can with hexahedra, leaving the awkward regions to tetrahedra or prisms.
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