[Gmsh] About *Surface sets in Gmsh - Abaqus

[MA Ariza-Gracia]

Dear Dr Geuzaine,

enclosed a .zip folder with STLs, .geo files and equivalent (hopefully) 
python scripts.

There are 2 folders:

- mesh-not-working: in this example I try to directly merge the STLs in 
a closed surface shell. It fails to generate the volume mesh

- mesh-working: in this example the triangulations are 'stitched' 
together before generating a single STL (I do it myself by substituting 
coincident nodes). This works.


What I don't get is why the first approach is complaining about an 
intersection and the second one works fine (I forced the nodes in the 
boundary to be the same).


Best,


MA


On 05/11/2019 16:23, Christophe Geuzaine wrote:
>
>> On 4 Nov 2019, at 13:59, MA Ariza-Gracia <miguel.ariza at artorg.unibe.ch> wrote:
>>
>> Dear all,
>>
>> from a STL surface I meshed a volume. I need to have one surface to apply a pressure boundary condition in a subsequent Abaqus analysis. The problem of keeping the surface and the volume is that elements and nodes are duplicated (even if I tried coherence / remove duplicate options).
> Can you send a small example that shows the problem? Defining a physical volume + a physical surface will lead to volumes + surface elements, but *not* to duplicate nodes.
>
> Christophe
>
>> Is there a way of defining a *Surface set (defined in abaqus by the facet of the elements on where to apply the BC). From what I've read, I'm not sure if this is possible.
>>
>> Best,
>>
>> MA
>>
>>
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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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