[Gmsh] 3d Meshing Issue

Thu Oct 25 11:53:14 CEST 2012

Hi Courtney,

you should test the workflow with a smaller geometry file. Meshing your file takes forever on my machine, I have though aborted the process.
Make sure that you do a _3D_ mesh, and that "save all (ignore physical groups)" is checked when you save your mesh. You will have to fiddle with mesh width, look at the possibilities under Tools->Options->Mesh, " General" and "Advanced" tabs. Then normally you should get a 3D mesh which ElmerGUI will load.

And if you send your questions to the gmsh list, more people will be able to help you.

Best regards,

Matthias

Von: courtney gras [mailto:cag35 at zips.uakron.edu]
Gesendet: Mittwoch, 24. Oktober 2012 18:43
An: Zenker, Dr. Matthias
Betreff: Re: [Gmsh] 3d Meshing Issue

Hi Matthias,

I apologize - it appears that approach 1 did not generate a volume (I cannot see any volume elements listed in gmsh as I previously thought). So at this point, I believe I need to add a physical volume, although that method has not worked as I previously pointed out. I noticed in my .msh file that it is empty, which is obviously the source of my problem. I have attached both the .geo and .msh for reference (from approach #2).

Would you happen to know if there is any particular method I should be using to create the volume mesh?

Thanks again for your time.

Regards,
Courtney
On Wed, Oct 24, 2012 at 11:01 AM, Zenker, Dr. Matthias <Matthias.Zenker at erbe-med.com<mailto:Matthias.Zenker at erbe-med.com>> wrote:
Hi Courtney,

I would use your approach 1, but make sure that "save all (ignore physical groups)" is checked when saving the mesh.
Remark concerning ElmerGUI: If you don't see volume elements, check Model->Summary. Volume elements can be made visible with View->Volume Mesh.

HTH,

Matthias

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Von: courtney gras [mailto:cag35 at zips.uakron.edu<mailto:cag35 at zips.uakron.edu>]
Gesendet: Mittwoch, 24. Oktober 2012 16:51
An: Zenker, Dr. Matthias
Betreff: Re: [Gmsh] 3d Meshing Issue

Yes, I do see volumes. I have tried the following approaches (and see volumes listed in gmsh in both methods):

1. Simply opening my .step file and meshing 1, 2, and 3D.
2. Creating a volume physical group using the GUI, and then meshing as above

when I attempt to open the .msh file in Elmer, I get 2 different responses:

1. When I open the first file, it opens as usual, but opens with no volume elements
2. When I open the second file, it does not open at all - Elmer says that there are 0 elements in the file.

I appreciate your assistance - any advise is much appreciated!

Regards,
Courtney
On Wed, Oct 24, 2012 at 5:17 AM, Zenker, Dr. Matthias <Matthias.Zenker at erbe-med.com<mailto:Matthias.Zenker at erbe-med.com>> wrote:
Hi,

I have difficulties to open your STEP file, my gmsh hangs when I try it.
What you can check: Are you sure you generated a 3D mesh? When you open your .msh file with gmsh, do you see volumes in Tools->Visibility?

HTH,

Matthias

Von: courtney gras [mailto:cag35 at zips.uakron.edu<mailto:cag35 at zips.uakron.edu>]
Gesendet: Dienstag, 23. Oktober 2012 20:43
An: gmsh at geuz.org<mailto:gmsh at geuz.org>
Betreff: [Gmsh] 3d Meshing Issue

To Whom it May Concern,

I am attempting to mesh a rather complex geometry representative of a 3/0 AWG copper wire. I have a .step file (attached) for this geometry. When I attempt to mesh this geometry and open it in Elmer (for additional analysis), I noticed that the mesh has " 0 volume elements".

Would you be able to assist with this issue? I'm thinking I may not have the correct options setup for meshing a geometry such as this.

 I should point out that I am not very experienced with finite element analysis, as this is my first attempt at using software such as gmsh and elmer.

Thank you for your time!

Regards,
--
Courtney Gras
The University of Akron
Electrical Engineering, 2013
(216)543-6066<tel:%28216%29543-6066>

_____________________________________________________________________
ERBE Elektromedizin GmbH
Firmensitz: 72072 Tuebingen
Geschaeftsfuehrer: Christian O. Erbe, Reiner Thede
Registergericht: Stuttgart HRB 380137

--
Courtney Gras
The University of Akron
Electrical Engineering, 2013
(216)543-6066<tel:%28216%29543-6066>

_____________________________________________________________________
ERBE Elektromedizin GmbH
Firmensitz: 72072 Tuebingen
Geschaeftsfuehrer: Christian O. Erbe, Reiner Thede
Registergericht: Stuttgart HRB 380137

--
Courtney Gras
The University of Akron
Electrical Engineering, 2013
(216)543-6066

_____________________________________________________________________
ERBE Elektromedizin GmbH
Firmensitz: 72072 Tuebingen
Geschaeftsfuehrer: Christian O. Erbe, Reiner Thede
Registergericht: Stuttgart HRB 380137

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