[Gmsh] Could not orient surface normal ?

[Christophe Geuzaine]

> On 18 Nov 2015, at 16:12, Aleksejs Fomins <aleksejs.fomins at lspr.ch> wrote:
> 
> Dear Prof. Geuzaine,
> 
> Thank you very much for your reply.
> 
> May I ask how you discovered that the curves were overlapping? It could help me to debug this and further problems
> 

I used: Geometry->Color->Highlight orphan entities.

I often also 

- generate a surface grid
- create a post-processing view based on the grid (Plugin->New view)
- compute the boundary of the grid (Plugin->Skin) and check if it is empty

Christophe

> Kind regards,
> Aleksejs
> 
> On 15.11.2015 15:19, Christophe Geuzaine wrote:
>> 
>>> On 11 Nov 2015, at 10:53, Aleksejs Fomins <aleksejs.fomins at lspr.ch <mailto:aleksejs.fomins at lspr.ch>> wrote:
>>> 
>>> Dear GMSH,
>>> 
>>> I have a model for a cavity simulation necessary for my PhD.
>>> 
>>> 2D mesh works fine, 3D mesh throws a bunch of warnings like
>>> 
>>> Warning : Converged for i=7 j=5 (err=1.81843e-08 iter=2) BUT xyz error = 12.5473 in point (-1.604927e+01,-5.104927e+01,4.445920e+01) on surface 123
>>> 
>>> and produces a completely rubbish mesh. I attach the geometry and the full error log.
>>> 
>> 
>> The geometry seems wrong: there are overlapping curves (orphaned, colored in orange in the attached picture).
>> 
>> 
>>> Any advice would be appreciated.
>>> 
>>> Kind regards,
>>> Aleksejs Fomins
>>> <cavity-rectangular-rev-1400.geo><error.txt>_______________________________________________
>>> gmsh mailing list
>>> gmsh at geuz.org <mailto:gmsh at geuz.org>
>>> http://www.geuz.org/mailman/listinfo/gmsh
>> 
>> -- 
>> Prof. Christophe Geuzaine
>> University of Liege, Electrical Engineering and Computer Science 
>> http://www.montefiore.ulg.ac.be/~geuzaine
>> 
>> Tetrahedron V, July 4-5 2016: http://tetrahedron.montefiore.ulg.ac.be
>> Free software: http://gmsh.info | http://getdp.info | http://onelab.info
>> 

-- 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://www.montefiore.ulg.ac.be/~geuzaine

Tetrahedron V, July 4-5 2016: http://tetrahedron.montefiore.ulg.ac.be
Free software: http://gmsh.info | http://getdp.info | http://onelab.info