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How to define patches after gmshToFoam ?

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Old   February 3, 2010, 06:40
Default How to define patches after gmshToFoam ?
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Sébastien
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Hi,

I made a 3D model in gmsh and then export it with gmshToFoam.

In gmsh I have defined the tags of my boundary with "Physical faces", but these tags seems to go away after the use of gmshToFoam.

So I have to define my physical boundary as patches in the boundary file of openfoam -> I need to know the total number of face and the first face of each of my boundary.

Is there a simple way these datas in paraFoam ? Maybe a way to select a boundary with the mouse and get the datas ? Or an ohter way to define my boundaries ?

Thanks a lot for your help,

Best regards
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Old   February 8, 2010, 07:04
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Davide Fransos
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I usually define boundaries as

Physical Surface("name") = {number};

in gmsh and it works fine with gmshToFoam.
Could you post your .geo file?
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Old   July 5, 2011, 08:32
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Richard Moser
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I have exactly the same problem with the surfaces not being translated into boundaries after using gmshToFoam. I have attached an example that I found on the forums which worked for other people, but not for me (using OpenFOAM 1.7.1 and gmsh 2.5.0). Any ideas?
Attached Files
File Type: txt test.geo.txt (601 Bytes, 18 views)
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Old   July 5, 2011, 09:36
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Pablo Caron
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Hello Davide and Richard, same problem here. I have used gmsh for about a year.

I reinstalled my OS recently (opensuse 11.4 64 bit) I could not find out how to get gmsh 2.5 and OF-1.6-ext working together.

I solved the problem downgrading to gmsh 2.4.2. It works perfectly now.

I hope this can help you.

Regards

Pablo
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Old   July 5, 2011, 15:43
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Kevin
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Gmsh 2.5 with OpenFOAM 1.7.1 work for me. Also works with OpenFOAM 2.0. Although I haven't had this exact issue, I have had issues in the past and found that the wrong settings in gmsh can mess everything up. Here's the Mesh options that work for me, might wanna try them out: http://imgur.com/a/X2Slw
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Old   July 7, 2011, 02:27
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Richard Moser
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Many thanks Pablo. Using the latest nightly build of gmsh (2.5.1) sorted the problem for me, and all the patches now come through to OpenFOAM.
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Old   July 12, 2011, 17:46
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Pablo Caron
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Hello Richard, sorry for the late reply.

I downloaded the nightly source code yesterday and I still could not get my patches in openfoam.

Did you download the source code or the precompiled version?

Using this source code I solved a problem related with opencascade (a missing header) but I still have the patches related issue. I tried the msh file in other openfoam installation and the problem persist.

Any ideas?

Regards

Pablo
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Old   July 13, 2011, 02:38
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Richard Moser
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I was using the pre-compiled version under Windows (haven't yet tried it under Linux).

If you attach your .geo file I could have a go and see if it works with my system, if you like.

Richard
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Old   July 13, 2011, 09:25
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Pablo Caron
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Hello Richard,

You can follow this link to download the files

p, li { white-space: pre-wrap; } https://spideroak.com/browse/share/C...o_Pablo/Public

It is a very simple geometry. A L shaped domain in 2D. There are 3 files, the geo file, and 2 msh files, generated with gmsh 2.4.2 and 2.5.1. The one generated with 2.5.1 version does not generate the patches from the physical surfaces.

Thank you for your help

Pablo
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