[Gmsh] MSH Format

[Serban.Georgescu at uk.fujitsu.com]

Hi Theodore,

I'm afraid that currently I cannot share the software (internal use only), but the idea is simple.
First I go to the $Nodes section, and read all coordinates. Then I go the $Element section, and for each line I split into tokens.
The first one is the element type, and I only look at tetrahedral  (4 for 1st order tetra and 11 for 2nd order). The rest I ignore.
I read according to the mesh file format:

elm-number elm-type number-of-tags < tag > ... node-number-list

so basically I skip the tags and only read the conenctivity information.

That's about it.

Cheers,
Serban


From: Ted Kord [mailto:teddy.kord at gmail.com]
Sent: 07 July 2011 20:57
To: Serban Georgescu
Cc: gmsh at geuz.org
Subject: Re: [Gmsh] MSH Format

Hi Serban,

It does, thanks.

You couldn't possibly send me the converter could you.

Regards

Theodore
On 7 July 2011 20:41, <Serban.Georgescu at uk.fujitsu.com<mailto:Serban.Georgescu at uk.fujitsu.com>> wrote:
Hi Theodore,

I am currently doing exactly what you are saying.
I have a converter that reads only the tetrahedral elements from the mesh file and outputs a mesh format specific to the FEM solver that I am using. I then set the boundary conditions using the Pre-Post tool that comes with the solver. So I am ignoring all non-tetrahedral elements in the Gmsh mesh file.

Hope that answers you question.

Cheers,
Serban

From: gmsh-bounces at ace20.montefiore.ulg.ac.be<mailto:gmsh-bounces at ace20.montefiore.ulg.ac.be> [mailto:gmsh-bounces at ace20.montefiore.ulg.ac.be<mailto:gmsh-bounces at ace20.montefiore.ulg.ac.be>] On Behalf Of Ted Kord
Sent: 07 July 2011 20:28
To: gmsh at geuz.org<mailto:gmsh at geuz.org>
Subject: [Gmsh] MSH Format

This may be a naive question but humour me.

I've meshed my geometry using Gmsh  and the mesh file has the usual format. In the $Elements section, there's connectivity for triangles and tetrahedra. Am I correct in saying that:

a) the triangles are surface/boundary elements and

b) I can ignore the triangles (if for the moment, I'm not concerned with boundary conditions, etc) and only use the connectivity information for the tetrahedra and still have the mesh and its nodes correctly represented?

If the answers to these are 'NO', is there a way for me to generate a mesh with only nodes and connectivity information for tetrahedral elements only?

..
$MeshFormat
2.2 0 8
$EndMeshFormat
$Nodes
241401
1 2.848267 -65.8432 2.187612
..
..
$EndNodes
$Elements
1379514
1 1 2 0 7 1102 1101
..
..
210000 4 2 0 9 189345 47114 189340 189339
210001 4 2 0 9 189345 47114 48392 189340
$EndElements


--
Best regards,

Theodore



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Best regards,

Theodore



______________________________________________________________________
                                        
 Fujitsu Laboratories of Europe Limited
 Hayes Park Central, Hayes End Road, Hayes, Middlesex, UB4 8FE
 Registered No. 4153469
 
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