Hi,
I wonder if someone ever encountered the problem of failed hexa elements (negative Jacobian) after splitting tets4 into hexas.
I usually mesh solids with tets , directly without previous surface meshing, and split them into 4 hexas each. Often comes the message,that some node could not be placed on surface.
The tet mesh is very good however hexas often fail. Not always the same hexas (20 out of 200,000) their locations depend on tetra meshing parameters.
Thanks