3. Generation of Hexahedral Meshes

Since many solvers require purely hexahedral meshes, HOPR implements a subdivision strategy to split meshes consisting of tetrahedra, prisms and hexahedra into purely hexahedral meshes. This feature is activated using the parameter splitToHex=T. Note, that pyramids cannot be decomposed to hexahedra in a straightforward way, thus this feature cannot be applied to meshes containing pyramids. Also note that this option is currently limited to linear meshes.

../Splittohex0.png — Fig. 3.1 Mesh consisting of 6 tetrahedra

../Splittohex1.png — Fig. 3.2 Each tetrahedron subdivided into 4 hexahedra

Parameter File

To test this feature, set elemtype to either 104 (Tetrahedron) or 106 (Prism with triangular base) and add splitToHex=T to the parameter file, which is found in

tutorials/1-01-cartbox/parameter.ini