[Gmsh] Creating a spherical hole inside a volume [Files attached for testing]

[Prithivirajan V]

Thanks Guillaume !

I tried using the OpenCascade factory but I am getting an error, Possible
due to the way I am importing stl files. Is there a specific way of
importing them when I use
OpenCascade ?

I am getting the following errors (GEO file is attached) :

Info    : Done reading 'Grain_Feature_1.stl'
Error   : Unknown OpenCASCADE face with tag 1
Error   : Unknown OpenCASCADE surface loop with tag 1

Info    : Done reading 'Grain_Feature_2.stl'
Error   : Unknown OpenCASCADE face with tag 2
Error   : Unknown OpenCASCADE surface loop with tag 2
Error   : Unknown OpenCASCADE entity of dimension 3 with tag 1


Could you or anyone help me fix this ??

On Fri, Mar 17, 2017 at 6:13 AM, DILASSER Guillaume <
Guillaume.DILASSER at cea.fr> wrote:

> Hello,
>
>
>
> Unfortunately, Gmsh is fairly limited when it comes to operations like
> computing intersections
> <http://gmsh.info/doc/texinfo/gmsh.html#and-what-Gmsh-is-not-so-good-at>.
> However, you might be able to do something using the OpenCascade factory
> included in the latest nigthly build. You can download it from gsmh.info
> <http://gmsh.info/>, under the download paragraph, just under the
> “Development version” mention. For example, you might want to have a look
> at the Boolean.geo exemple here
> <https://onelab.info/svn/gmsh/trunk/demos/boolean/> and there few
> examples on how to import geometry from files (they will only work with the
> nightly, ID & password = gmsh). Hoping that will be helpful,
>
>
>
> Faithfully 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
>
>
>
> *De :* gmsh [mailto:gmsh-bounces at ace20.montefiore.ulg.ac.be] *De la part
> de* Prithivirajan V
> *Envoyé :* vendredi 17 mars 2017 03:23
> *À :* gmsh at geuz.org
> *Objet :* [Gmsh] Creating a spherical hole inside a volume [Files
> attached for testing]
>
>
>
> Hello all,
>
> My objective is to create the spherical hole inside a volume. I have 2 STL
> files(see attached) as inputs. The complication is that the spherical hole
> intersects the two other existing volumes and it is not contained entirely
> in either one of the volumes.
>
>
> I tried two approaches both of them were a failure (geo files are attached
> for both) :
>
> *Approach 1 :*
>
>
>
> I used the merge command and then I created a spherical volume  and
> performed meshing. The issue is the sphere is getting meshed separately
> without any relation to the other 2 volumes.
>
>
> *Approach 2 :*
>
> First , I created an STL file of the spherical void separately. Now I used
> merge command on all 3 STL files. Now i am getting intersections which I
> am unable to resolve.
>
> *I have been stuck here for a while in this, your help would be greatly
> appreciated*!!!!
>
>
>
> Thanks,
>
> Prithivi
>
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