四面体网格划分问题

float trias/quads

Matches the node locations of the volume elements with those of the surface mesh, but the connectivity may be modified to produce a better mesh. Normally, this results in some tetra faces going across tria diagonals. Base quad surface elements are split into two trias

fixed trias/quads

Matches the node locations of the volume elements with those of the surface mesh. It guarantees the connectivity of the tetras with the trias. Use this option whenever you need to match other components to the resulting volume mesh, or when you need to generate layers composed of pentas/hexas.