[Gmsh] Separate msh files for conforming meshes of two different domains.

[David Colignon]

On 07/06/16 09:25, Uģis Lācis wrote:

> Thank you for very quick answer!
>
> It fixes the issue, now I have perfectly conforming meshes.
>
> But maybe this is a thought for additional feature? It would be very convenient to pass as a command line argument the physical
> volume identifier, and have GMSH export corresponding mesh with adjacent physical surfaces? The example I sent in was quite
> simple, but real cases I am working on contains a lot of surfaces, which I suspect could be selected/deselected more efficient
> than commenting and un-commenting physical definitions.

Hi,

Something like:

gmsh -string "Physical Volume(50) = {43};" test_conforming.geo -3

could maybe help you ?

And see also the "Boundary" and "CombinedBoundary" commands in http://gmsh.info/doc/texinfo/gmsh.html#Transformations

Regards,

Dave

-- 
David Colignon, Ph.D.
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Université de Liège
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>
> Best,
> Uģis
>
> On 03/06/16 17:36, Theler German Guillermo wrote:
>> Hi
>>
>> Try comenting the definition of one physical volume and exporting one
>> mesh, then uncomment the first volume and comment the second and export
>> the second mesh. Make sure Mesh.SaveAll = 0 (see
>> http://gmsh.info/doc/texinfo/gmsh.html#Mesh-options-list )
>>
>>
>>
>> --
>> --
>> Germán Theler :: CTO Ingeniería & TICs
>>
>> CITES – Centro de Innovación Tecnológica Empresarial y Social S.A.
>> Dirección General Sancor Seguros
>> Grupo Sancor Seguros
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>> gtheler at cites-gss.com
>> www.cites-gss.com - www.gruposancorseguros.com
>>
>> On Fri, 2016-06-03 at 09:33 +0200, Uģis Lācis wrote:
>>> Hi everyone,
>>>
>>> I am using GMSH to generate a 3D mesh to solve fluid and solid equations
>>> in FreeFem++ in a coupled manner. So far I have generated two different
>>> *.geo files for fluid and solid part, and that has produced reasonable
>>> results for me up till now.
>>>
>>> However, when investigating the produced meshes in a close up, it seems
>>> that the generated meshes does not conform exactly... there are some
>>> tiny differences at some points. I would like to get rid of those.
>>>
>>> I have generated a single .geo file for both domains (see example
>>> attached), but I am not able to export two separate mesh files - one for
>>> physical volume "50" (and adjacent physical surfaces), and other for
>>> physical volume "51" (and adjacent physical surfaces).
>>>
>>> For me the task seems simple. Is there an easy/automatic way to do that
>>> using gmsh?
>>>
>>> I could of course write a script, that takes the whole mesh and extracts
>>> the needed elements to other file, but for me it makes sense that such
>>> functionality would be present within GMSH already.
>>>
>>> I am using GMSH version 2.12.0.
>>>
>>> Best regards,
>>> Ugis
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