[Gmsh] refine existing mesh

[Juan E. Sanchez]

Hello,

Unfortunately, I do not have the geometrical description.  Is there a 
way to convert the mesh to a geometrical description?

Regards,

Juan

On 2/12/18 1:21 AM, Christophe Geuzaine wrote:
> 
> 
>> On 10 Feb 2018, at 22:06, Juan E. Sanchez <juan.e.sanchez at gmail.com 
>> <mailto:juan.e.sanchez at gmail.com>> wrote:
>>
>> Hello,
>>
>> I have an existing msh file, and a pos file containing a background 
>> mesh.  Is there a script example showing how to use these files to 
>> create a refined mesh using the background field?
>>
> 
> Start from the geometrical description (not the mesh): this way Gmsh 
> will be able to place the new vertices correctly, i.e. on the CAD
> 
> gmsh -3 test.geo -bgm test.pos
> 
> CG
> 
>> Using
>>
>> gmsh -3 test.msh -bgm test.pos
>>
>> results in a mesh where there is the same number of nodes and 
>> elements, but it appears that the physical entity number is lost:
>>
>> last element in original file:
>>
>> 36210 4 3 15 15 0 5786 5791 5792 5800
>>
>> last element in new file:
>>
>> 36210 4 2 0 15 2603 5822 2604 2605
>>
>> Now all of the mesh elements belong to the same physical entity, 0.
>>
>> If I perform a "refine by splitting" in the gui, the physical entity 
>> information is maintained:
>>
>> 266256 4 2 15 15 42825 10009 41452 9710
>>
>> The file is a 3d tetrahedral mesh, and it also contains triangular 
>> surfaces to impose boundary conditions.
>>
>> Regards,
>>
>> Juan
>>
>>
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> 
> —
> Prof. Christophe Geuzaine
> University of Liege, Electrical Engineering and Computer Science
> http://www.montefiore.ulg.ac.be/~geuzaine
> 
> Free software: http://gmsh.info | http://getdp.info | http://onelab.info
>