[Gmsh] Voronoi tessellation

[David Colignon]

> Thank you for your advice.
>
> Then, user have to redefine all lines and surfaces by hand??
>
> or is there any option to merge the geometry automatically??

If you add

Coherence;

at the end of your .geo file, the duplicated lines will be removed.

I think the problem comes from lines 54 and 90 which are crossing each other and from surfaces 180 and 204 which are 
partially superposed

Regards,

Dave


>
> I use 'Merge' in gmsh GUI, then too many error occur.
>
> Regards,
>
> Sang-yeop Chung
>
>
>
> 2009/12/11 David Colignon <David.Colignon at ulg.ac.be
> <mailto:David.Colignon at ulg.ac.be>>
>
>     Hi,
>
>     the problem is that most of your Lines are defined twice, for
>     example, Line 63 from point 44 to 42, and Line 71 from point 42 to
>     44 ...
>     If two triangles share a common edge/line, this common edge must be
>     defined only once, and used in the definition of the Line Loop of
>     the two surfaces.
>
>     Regards,
>
>     Dave
>
>
>
>     --
>     David Colignon, Ph.D.
>     Collaborateur Logistique du F.R.S.-FNRS
>     CÉCI - Consortium des Équipements de Calcul Intensif
>     ACE - Applied & Computational Electromagnetics
>     Sart-Tilman B28
>     Université de Liège
>     4000 Liège - BELGIQUE
>     Tél: +32 (0)4 366 37 32
>     Fax: +32 (0)4 366 29 10
>     WWW: http://hpc.montefiore.ulg.ac.be/
>     Agenda:
>     http://www.google.com/calendar/embed?src=david.colignon%40gmail.com
>
>
>     On 11/12/09 08:02, 정상엽 wrote:
>
>         Hi,
>
>         Thank you for advice,
>
>         But i have another question.
>
>         To figure out geometry error, as you said,
>
>         I made another voronoi geometry and meshing it (which is
>         contained in
>         the mail).
>
>         but there is same message as follows:
>
>         ...
>         ...
>         Info    : Meshing volume 246 (Delaunay)
>         Error   : Self intersecting surface mesh, computing
>         intersections (this
>         could take a while)
>         Info    : 103 faces self-intersect
>         ...
>         ...
>
>         Then i check the volume in the geometry,
>
>         But nothing is wrong. All the volume are well defined.
>
>         What should i do, or what is the wrong point in the geometry??
>
>         How can i check it??
>
>         I really appreciate your advice.
>
>
>         Sang-yeop Chung.
>
>
>
>
>         2009/12/10 David Colignon <David.Colignon at ulg.ac.be
>         <mailto:David.Colignon at ulg.ac.be>
>         <mailto:David.Colignon at ulg.ac.be <mailto:David.Colignon at ulg.ac.be>>>
>
>
>             Hi,
>
>
>
>             --
>             David Colignon, Ph.D.
>             Collaborateur Logistique du F.R.S.-FNRS
>             CÉCI - Consortium des Équipements de Calcul Intensif
>             ACE - Applied & Computational Electromagnetics
>             Sart-Tilman B28
>             Université de Liège
>             4000 Liège - BELGIQUE
>             Tél: +32 (0)4 366 37 32
>             Fax: +32 (0)4 366 29 10
>             WWW: http://hpc.montefiore.ulg.ac.be/
>             Agenda:
>         http://www.google.com/calendar/embed?src=david.colignon%40gmail.com
>
>
>
>             On 10/12/09 07:18, 정상엽 wrote:
>
>
>                 Dear, Gmsh developer
>
>                 I made a voronoi geometry and meshing it using 'gmsh'.
>
>                 But when meshing the geometry, the error message
>         represent as
>                 follows,
>
>                 ------------------------------------------------
>                 Error : Mesh generation error summary
>                 Error : 0 warning
>                 Error : 1 error
>                 Error : Check the full log for details
>                 -------------------------------------------------
>
>
>
>             Hi,
>
>             this is only the summary of the error message printed at the
>         end.
>             You have to search for the real error message in all the
>         text that
>             was printed before. And you will find something like:
>
>             ...
>             ...
>             Info    : Meshing volume 553 (Delaunay)
>             Error   : Self intersecting surface mesh, computing
>         intersections
>             (this could take a while)
>             Info    : 232 faces self-intersect
>             Info    : face (181 14 31) on model face 81
>             ...
>             ...
>
>             That means that you have a problem in your geometry.
>
>             If you look at your Volumes with Tools -> Visibility , you
>         will see
>             that most of your volumes are completely wrong !
>
>             Regards,
>
>             Dave
>
>
>
>
>                 How can i fix it, does it have problem in geometry??
>
>                 or it is impossible 3D meshing??
>
>                 I send you the geometry file.
>
>                 Thank you.
>
>
>
>
>
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>
> --
> Sang-Yeop, Chung
> Ph.D student.
> School of Civil and environmental Eng.
> Yonsei University, Seoul, Korea
> E-mail : sychung at yonsei.ac.kr <mailto:sychung at yonsei.ac.kr>
>