Hexahedral mesh

newcfd

The advantages of hexahedral mesh:
    1. Hexahedron provides shape functions with additional terms
       that may increase the accuracy of the solution.
    2. Hexahedron provides directional sizing without losing accuracy.
       For example, a very thin hexahedron wihtin a bounday layer for
       fluid flow calculations performs far better than thin
       tetrahedron.
    3. A conformal mesh provides the most accurate forms of connectivity
       within the region. Non-conformal interfaces may decrease the
       meshing complexity but increase the error, at least locally.
    4. A hexahedral mesh decreases the overall element count. A tetrahedral
       mesh usually increases the element count 4 to 10 fold over a
       hexahedral mesh.