[Gmsh] 3D meshing

[Jean-François Remacle]

Le 1 sept. 2011 à 14:11, Cristóbal Bertoglio B. a écrit :

> Hi
> 
> so I re-run the meshing in old testcases and the Delaunay (plus the
> two types of optimization) gives always better meshes than in the
> frontal case, and without tetras with the 4 vertices on the external
> surface.
> 
> The price is that it creates much more nodes, but the real problem is
> it creates also additional triangles on the surface (what it is not
> convenient for me since I'm doing FSI).
> 
> Hence, it is possible to tell gmsh not to create additional triangles
> on the surface ? (if yes this would be already great).
> 

Only using the frontal mesher, sorry

JF


> Thanks
> 
> Cristobal.
> 
> 2011/9/1 Christophe Geuzaine <cgeuzaine at ulg.ac.be>:
>> 
>> On 31 Aug 2011, at 14:13, Cristóbal Bertoglio B. wrote:
>> 
>>> Hi
>>> 
>>> I'm trying to construct a volumetric mesh from an already existing surface mesh.
>>> 
>>> In past tests I was using the Frontal algorithm (+ netgen
>>> optimization) since it gave me less nodes, no surface triangles and no
>>> tetrahedra with the 4 nodes on the external surface. However, when
>>> running it for this example gives several errors of type I indicate
>>> bellow.
>>> 
>>> In contrast,  Algorithm 1 works perfectly (however it produces more
>>> nodes, create surface triangles and give me tetrahedra with the 4
>>> nodes on the external surface, all things that I want to avoid).
>>> 
>>> Does some know the reason why Delaunay works and Frontal doesn't ?
>>> 
>> 
>> Hi Cristobal,
>> 
>> The frontal algorithm is definitely less robust than the Delaunay. Do you still get bad tets if you optimize your mesh ("Optimize" and/or "Optimize Netgen") in the mesh menu?
>> 
>> 
>> 
>>> The mesh is also attached.
>>> 
>>> Thanks in advance,
>>> 
>>> Cristobal.
>>> 
>>> -------------
>>> 
>>> Info    : Meshing volume 0 (Frontal)
>>> Info    : Region 0 Face 1, 3 intersect
>>> Info    : CalcLocalH: 13932 Points 0 Elements 27860 Surface Elements
>>> Info    : Check subdomain 1 / 1
>>> Info    : 27860 open elements
>>> Error   : ERROR: Edge 20 - 33 multiple times in surface mesh
>>> ......
>>> Error   : ERROR: Surface mesh not consistent
>>> Error   : ERROR: Stop meshing since surface mesh not consistent
>>> Info    : Mesh 3D complete (1.84027 s)
>>> Info    : 13932 vertices 27860 elements
>>> Error   : ------------------------------
>>> Error   : Mesh generation error summary
>>> Error   :     0 warnings
>>> Error   :   201 errors
>>> Error   : Check the full log for details
>>> <aorta.stl>_______________________________________________
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>> 
>> --
>> Prof. Christophe Geuzaine
>> University of Liege, Electrical Engineering and Computer Science
>> http://www.montefiore.ulg.ac.be/~geuzaine
>> 
>> 
>> 
>> 
> 
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------------------------------------------------------------------
Prof. Jean-Francois Remacle
Universite catholique de Louvain (UCL)
Ecole Polytechnique de Louvain (EPL) - Louvain School of Engineering
Institute of Mechanics, Materials and Civil Engineering (iMMC)
Center for Systems Engineering and Applied Mechanics (CESAME)
Tel : +32-10-472352 -- Mobile : +32-473-909930 

 





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