[Gmsh] refine existing mesh

[Christophe Geuzaine]

> On 10 Feb 2018, at 22:06, Juan E. Sanchez <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

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