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GMSH mesh export problems

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Old   March 16, 2021, 04:21
Default GMSH mesh export problems
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jeppeth is on a distinguished road
Hi,
We are trying to export a mesh for EM FEM simulations.
We are having problems exporting so that we get PhysicalNames / physical groups assigned to the individual elements and nodes. I have included a the geo file below.
When we export the mesh all elements are assigned to group 0.
Thanks for the help.

-------------------

// Gmsh project created on Mon Mar 15 15:42:18 2021
SetFactory("OpenCASCADE");
//+
Point(1) = {-1, 1, 0, 1.0};
//+
Point(2) = {1, 1, 0, 1.0};
//+
Point(3) = {1, -1, 0, 1.0};
//+
Point(4) = {-1, -1, 0, 1.0};
//+
Point(5) = {-0.9, 0.9, 0, 1.0};
//+
Point(6) = {0.9, 0.9, 0, 1.0};
//+
Point(7) = {0.9, -0.9, 0, 1.0};
//+
Point(8) = {-0.9, -0.9, 0, 1.0};
//+
Line(1) = {1, 2};
//+
Line(2) = {2, 6};
//+
Line(3) = {6, 5};
//+
Line(4) = {5, 1};
//+
Line(5) = {2, 3};
//+
Line(6) = {7, 3};
//+
Line(7) = {7, 6};
//+
Line(8) = {7, 8};
//+
Line(9) = {8, 4};
//+
Line(10) = {4, 3};
//+
Line(11) = {8, 5};
//+
Line(12) = {1, 4};
//+
Curve Loop(1) = {1, 2, 3, 4};
//+
Plane Surface(1) = {1};
//+
Curve Loop(2) = {2, -7, 6, -5};
//+
Plane Surface(2) = {2};
//+
Curve Loop(3) = {8, 9, 10, -6};
//+
Plane Surface(3) = {3};
//+
Curve Loop(4) = {11, 4, 12, -9};
//+
Plane Surface(4) = {4};
//+
Curve Loop(5) = {3, -11, -8, 7};
//+
Plane Surface(5) = {5};
//+
Extrude {0, 0, 4} {
Surface{1};
}
//+
Extrude {0, 0, 4} {
Surface{2};
}
//+
Extrude {0, 0, 4} {
Surface{3};
}
//+
Extrude {0, 0, 4} {
Surface{4};
}
//+
Extrude {0, 0, 4} {
Surface{5};
}
//+
Physical Volume("freeSpace", 53) = {5};
//+
Physical Volume("metal", 54) = {1};
//+
Physical Volume("metal", 54) += {4};
//+
Physical Volume("metal", 54) += {3};
//+
Physical Volume("metal", 54) += {2};
//+
Physical Surface("port1", 55) = {30};
//+
Physical Surface("port2", 56) = {5};

-------------------


$MeshFormat
4.1 0 8
$EndMeshFormat
$PhysicalNames
4
2 55 "port1"
2 56 "port2"
3 53 "freeSpace"
3 54 "metal"
$EndPhysicalNames
$Entities
28 52 30 5
1 -1 1 0 0
2 1 1 0 0
3 1 -1 0 0
4 -1 -1 0 0
5 -0.9 0.9 0 0
6 0.9 0.9 0 0
7 0.9 -0.9 0 0
8 -0.9 -0.9 0 0
9 -1 1 4 0
10 1 1 4 0
11 0.9 0.9 4 0
12 -0.9 0.9 4 0
13 1 1 4 0
14 0.9 0.9 4 0
15 0.9 -0.9 4 0
16 1 -1 4 0
17 0.9 -0.9 4 0
18 -0.9 -0.9 4 0
19 -1 -1 4 0
20 1 -1 4 0
21 -0.9 -0.9 4 0
22 -0.9 0.9 4 0
23 -1 1 4 0
24 -1 -1 4 0
....
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