Hello,
I am trying to write .msh files for use in Elmer, however I am having some
problems with boundary condition grouping.
What is the correct way to either (1) use GMSH to export simple groupings in
msh files (It always seems to drop the physical groups?) or (2) write physical
groups to a .msh file. I am looking for an example that I can copy from.
The documentation did not seem quite clear, at least to me in the description
of the physical names. As far as I can see, a valid section might be
something like:
$PhysicalNames
1
2 (Something) "description"
$EndPhysicalNames
But I am unclear on the "Something", and the "description" secions
So using an example to clarify, I have the following unit cube, with surface
triangles:
$MeshFormat
2.1 0 8
$EndMeshFormat
$Nodes
8
1 0 0 0
2 0 0 1
3 0 1 0
4 0 1 1
5 1 0 0
6 1 0 1
7 1 1 0
8 1 1 1
$EndNodes
$Elements
12
1 2 3 0 1 0 1 3 7
2 2 3 0 1 0 1 5 7
3 2 3 0 1 0 6 8 5
4 2 3 0 1 0 5 8 7
5 2 3 0 1 0 5 1 2
6 2 3 0 1 0 5 2 6
7 2 3 0 1 0 1 3 4
8 2 3 0 1 0 1 2 4
9 2 3 0 1 0 3 4 7
10 2 3 0 1 0 7 8 4
11 2 3 0 1 0 2 8 4
12 2 3 0 1 0 6 2 8
$EndElements
I might, say, like to group the top 2 triangles together (z=1), such that I can
assign them in Elmer to a single boundary condition, so what would the
PhysicalNames section look like? I can't quite seem to get it to work... Would
the following be right?
$PhysicalNames
1
2 11 12 "Top Boundary"
$EndPhysicalNames
Thanks,
D. Haley
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