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Gmsh does not ouput SU2 markers from physical surfaces

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Old   June 17, 2016, 09:02
Default Gmsh does not ouput SU2 markers from physical surfaces
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Hi All

For the last two days I've struggled with a problem I can't seem to solve, some help would be appreciated...

When I output a volume mesh from Gmsh in .SU2 format, the physical surfaces / volumes are not exported as "markers" in the file. Thus, SU2 does not not know which nodes form the surfaces of the body, farfield, inlet, etc. The volume mesh itself exports fine, it's just the marker sections that are missing.

Any ideas why this could be? Is there perhaps a way to export only the defined physical surfaces to SU2 format, so that I can manually merge the volume mesh with the physical surface boundaries? Gmsh doesn't give me the option to select specific physical entities when saving as .SU2?

For information, I generate an .STL geometry in OpenVSP with the inbuilt CFD meshing function. I then process the geometry as follows in Gmsh (I know I could have used extrude, but I kept the possibility open to have a non-box shaped boundary):

Merge "ABCDEFG.stl";
Point(1) = {-30, 20, 20, 1.0};
Point(2) = {-30, 20, -20, 1.0};
Point(3) = {-30, -20,20, 1.0};
Point(4) = {-30, -20,-20, 1.0};
Point(5) = {30, 20, 20, 1.0};
Point(6) = {30, 20, -20, 1.0};
Point(7) = {30, -20, 20, 1.0};
Point(8) = {30, -20, -20, 1.0};
Line(1) = {3, 7};
Line(2) = {1, 5};
Line(3) = {2, 6};
Line(4) = {4, 8};
Line(5) = {2, 4};
Line(6) = {6, 8};
Line(7) = {1, 3};
Line(8) = {5, 7};
Line(9) = {2, 1};
Line(10) = {4, 3};
Line(11) = {8, 7};
Line(12) = {6, 5};
Line Loop(13) = {9, 7, -10, -5};
Plane Surface(14) = {13};
Line Loop(15) = {2, 8, -1, -7};
Plane Surface(16) = {15};
Line Loop(17) = {12, -2, -9, 3};
Plane Surface(18) = {17};
Line Loop(19) = {5, 4, -6, -3};
Plane Surface(20) = {19};
Line Loop(21) = {12, 8, -11, -6};
Plane Surface(22) = {21};
Line Loop(23) = {10, 1, -11, -4};
Plane Surface(24) = {23};

Surface Loop(25) = {14, 18, 22, 16, 24, 20};
Surface Loop(27) = {1};
Volume(28) = {25,27};
Physical Surface("FARFIELD") = {25};
Physical Surface("BODY") = {27};

//To do inlet, outlet, etc.

Coherence;

Thanks a lot!
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Old   June 17, 2016, 09:22
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Just my luck, solved it 10 min after posting...

The physical surfaces must be of type "plane surface" and not "surface loop". Thus, replace the last two lines with

Physical Surface("FARFIELD") = {14, 18, 22, 16, 24, 20};
Physical Surface("BODY") = {1};

and it works perfectly.
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Old   June 18, 2016, 10:50
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Quote:
Originally Posted by stewels View Post
Just my luck, solved it 10 min after posting...

The physical surfaces must be of type "plane surface" and not "surface loop". Thus, replace the last two lines with

Physical Surface("FARFIELD") = {14, 18, 22, 16, 24, 20};
Physical Surface("BODY") = {1};

and it works perfectly.
Thank you for posting your solution - it may be useful to future users.
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Old   April 14, 2017, 16:14
Default gmsh to SU2 format
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Hi,

I am trying to output gmsh mesh file in .su2 format. It appears that you have done this, could you please explain how this was done?

Thanks!
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