[petsc-users] Issues creating DMPlex from higher order mesh generated by gmsh

[Vilmer Dahlberg]

Hi.


I'm trying to read a mesh of higher element order, in this example a mesh consisting of 10-node tetrahedral elements, from gmsh, into PETSC. But It looks like the mesh is not properly being loaded and converted into a DMPlex. gmsh tells me it has generated a mesh with 7087 nodes, but when I view my dm object it tells me it has 1081 0-cells. This is the printout I get


...

Info    : Done meshing order 2 (Wall 0.0169823s, CPU 0.016662s)

Info    : 7087 nodes 5838 elements

...

DM Object: DM_0x84000000_0 1 MPI process
  type: plex
DM_0x84000000_0 in 3 dimensions:
  Number of 0-cells per rank: 1081
  Number of 1-cells per rank: 6006
  Number of 2-cells per rank: 9104
  Number of 3-cells per rank: 4178
Labels:
  celltype: 4 strata with value/size (0 (1081), 6 (4178), 3 (9104), 1 (6006))
  depth: 4 strata with value/size (0 (1081), 1 (6006), 2 (9104), 3 (4178))
  Cell Sets: 1 strata with value/size (2 (4178))
  Face Sets: 6 strata with value/size (12 (190), 21 (242), 20 (242), 11 (192), 22 (242), 10 (188))
Field P2:
  adjacency FEM
...


To replicate the error try generating a mesh according to


https://gmsh.info/doc/texinfo/gmsh.html#t5


<https://gmsh.info/doc/texinfo/gmsh.html#t5>

setting the element order to 2, and then loading the mesh using


DMPlexCreateGmshFromFile


I don't have any issues when i set the element order to 1.


Thanks in advance,

Vilmer
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