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[Gmsh] Nasa Nozzle: Plot 3D -->gmsh -->fluent - no physical groups

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Old   June 12, 2016, 11:50
Default Nasa Nozzle: Plot 3D -->gmsh -->fluent - no physical groups
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Nico Guettler
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Hello guys,

I am a new user of Ansys fluent and Gmsh. In my first project I have to simulate an acoustic research nozzle 2 from NASA and compare some turbulence models.

So i have downloaded the different meshtypes (3D) + Neutral Map files from this homepage:

If I import only the .p3dfmt to Fluent I have no information about the boundary surfaces.

So i converted my .p3dfmt together with the NeutralMapFile into a gmsh-file using this script.

Now in Gmsh i could see the boundary zones. But if I look into the .geo file it looks a bit strange. I think there is something wrong?!

Discrete Face(-1) = {};
Physical Surface("b2-periodic_1deg") = {-1};
Physical Surface("b3-periodic_1deg") = {-1};
Physical Surface("b4-periodic_1deg") = {-1};
Physical Surface("b5-periodic_1deg") = {-1};
Physical Surface("b6-periodic_1deg") = {-1};
Physical Surface("b7-periodic_1deg") = {-1};
Physical Surface("b8-subsonic_inflow_pt") = {-1};
Physical Surface("b9-farfield_riem") = {-1};
Physical Surface("b10-viscous_solid") = {-1};
Physical Surface("b11-back_pressure") = {-1};
Physical Surface("b12-singular_axis") = {-1};
Physical Surface("b13-viscous_solid") = {-1};
Physical Surface("b14-singular_axis") = {-1};
Physical Surface("b15-viscous_solid") = {-1};
Physical Surface("b16-farfield_riem") = {-1};
Physical Surface("b17-farfield_riem") = {-1};
Physical Surface("b18-to-stitch-a") = {-1};
Physical Surface("b19-to-stitch-b") = {-1};
Physical Surface("b20-to-stitch-a") = {-1};
Physical Surface("b21-to-stitch-b") = {-1};
Physical Volume("mesh") = {-1};

So if I export this .msh from gmsh to fluent using a Nastran Bluk data file format the information about the physical groups get lost. (I dont clicked "save - ignore physical groups)
In addition other formats like .unv does not give the right informations in fluent.

My questions:

1. Is there something wrong with my physical groups in gmsh?
2. How could I export the whole informations including physical groups?
3. Are there any other ways to get the .p3d together with the .nmf into fluent?

Attachements: .p3dfmt, .nmf, .msh

ps: I am using gmsh 2.12 and Ansys v17

Thanks for your help
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Old   June 14, 2016, 06:40
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Nico Guettler
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Okay i have discared the gmsh data.

Instead of that i created my own surfaces using Icem and the option ofcreating new parts!
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export, fluent, gmsh, plot3d

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