[Gmsh] how fill a 2D-mesh with 3D-elements calling GMSH from the shell

[Johannes_ACKVA]

hello,

many thanks,  Guillaume Dilasser und Benjamin Jeanty-Ruard, for your
advices and time.

Unfortunally, I need that the surface mesh remains identic (same number
and positions of nodes), so your proposals are not suited to my problem.

I thought that any mesher (also those in GMSH) should be able to create
a 3D-mesh based on a closed hull of 2D-elements. Does anyone else know
if and how this can be achieved with GMSH?  If not I will search for
another tool,

thank you again and best regards

Johannes Ackva





On 20.02.2017 15:12, DILASSER Guillaume wrote:
> Hi Johannes,
> 
>  
> 
> The option -3 does indeed call the 3D meshing algorithm but for it to
> work, volumes have to be defined. In your case, since you feed Gmsh a
> MED file, you don't have any Gmsh geometrical elements declared, just
> pure mesh and the program does not know how to handle it. The first step
> is therefore to re-build geometrical elements to establish a model of
> your shell and then call the 3D algorithm to mesh inside. Have a look at
> the enclose files and let me know if it helped. Note that this procedure
> will re-mesh the shell and thus you might not (read : certainly won't)
> have the same surface mesh in you output file as in your input MED...
> 
>  
> 
> Sincerely Yours,
> 
>  
> 
> Guillaume DILASSER
> 
> Doctorant SACM / LEAS
> 
> CEA - Centre de Saclay - Bât.123 - PC 319c
> 
> 91191 Gif sur Yvette Cedex - France -
> 
>  
> 
> guillaume.dilasser at cea.fr <mailto:guillaume.dilasser at cea.fr>
> 
>  
> 
>  
> 
> -----Message d'origine-----
> De : gmsh [mailto:gmsh-bounces at ace20.montefiore.ulg.ac.be] De la part de
> Johannes_ACKVA
> Envoyé : lundi 20 février 2017 12:37
> À : gmsh at geuz.org
> Objet : [Gmsh] how fill a 2D-mesh with 3D-elements calling GMSH from the
> shell
> 
>  
> 
> hello
> 
>  
> 
> how can I fill a closed hull of 2D-elements with 3D-elements, by calling
> GMSH from the shell?
> 
>  
> 
> I tried this:
> 
>  
> 
>  
> 
>>    gmsh MeshTria_2D.med  -3 -o quark.med
> 
>  
> 
> Info    : Running '/opt/gmsh-2.13.1-Linux/bin/gmsh MeshTria_2D.med -3 -o
> 
> quark.med' [Gmsh 2.13.1, 1 node, max. 1 thread]
> 
> Info    : Started on Mon Feb 20 09:20:03 2017
> 
> Info    : Reading 'MeshTria_2D.med'...
> 
> Info    : Reading MED file V3.2.0 using MED library V3.2.0
> 
> Info    : Reading 3-D unstructured mesh <<MeshTria_2D>>
> 
> Info    : Done reading 'MeshTria_2D.med'
> 
> Info    : Finalized high order topology of periodic connections
> 
> Info    : Meshing 1D...
> 
> Info    : Done meshing 1D (8e-06 s)
> 
> Info    : Meshing 2D...
> 
> Info    : Done meshing 2D (6.91414e-06 s)
> 
> Info    : Meshing 3D...
> 
> Info    : Done meshing 3D (5e-06 s)
> 
> Info    : 8 vertices 24 elements
> 
> Info    : Writing 'quark.med'...
> 
> Info    : Done writing 'quark.med'
> 
> Info    : Stopped on Mon Feb 20 09:20:03 2017
> 
>  
> 
> but the resulting mesh does not contain any 3D-elements, it is identic
> to the input mesh.
> 
>  
> 
> Moreover, I discovered that after loading the 2D-mesh  (MeshTria_2D.med)
> into the GUI, the button "3D" in "Mesh" does not create any 3D-elements.
> 
> I fear that a geometry is needed. Or is there a manner to create a
> volume mesh from a 2D-mesh?
> 
>  
> 
> Many thanks for your help,
> 
>  
> 
> Johannes_ACKVA
> 
>  
> 
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