[Gmsh] Surface mesh contains ugly elements

[Christophe Geuzaine]

Hi Martin - Indeed, Gmsh still has trouble with parametrization of surfaces bounded by splines when the control points are not sufficiently regularly spaced. Attached is one possible solution; another would be to set more equispaced control points; yet another (but that would be a bit overkill...) would be to reparametrize the surface using a Compound.

PS: this is indeed the same problem as reported by Robert in bug#184. We are working on it...

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On 30 Oct 2013, at 13:44, Martin Vymazal <martin.vymazal at vki.ac.be> wrote:

> Hello,
> 
> the surface was only a part of a 3D geometry. I'm sending the whole thing.
> 
> Best regards,
> 
>   Martin Vymazal
> 
> 
> On Wednesday 30 October 2013 13:33:38 Jean-François Remacle wrote:
>> could you attach the .geo file ?
>> 
>> Le 30 oct. 2013 à 12:14, Martin Vymazal <martin.vymazal at vki.ac.be> a écrit :
>>> Hello,
>>> 
>>> I'm trying to generate a surface mesh of a bump given by a sine function.
>>> I
>>> tried
>>> 1) to take the contour of the bump (defined by a spline) and extrude it
>>> 2) generate two contours (front and back), then create a line loop and a
>>> surface
>>> 
>>> In both cases, I have a bad mesh at the beginning and at the end of the
>>> bump. I'd prefer to have a fully unstructured mesh, but transfinite will
>>> do as well. Unfortunately neither of them works (see attached pictures).
>>> 
>>> Does anyone have an idea how to fix it?
>>> 
>>> Thank you.
>>> 
>>> Martin Vymazal
>>> 
>>> <bump_ruled_surface.png><bump_transfinite_surface.png>____________________
>>> ___________________________ gmsh mailing list
>>> gmsh at geuz.org
>>> http://www.geuz.org/mailman/listinfo/gmsh
>> 
>> ------------------------------------------------------------------
>> 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
> <bump_contour.geo><bump3d.geo>_______________________________________________
> gmsh mailing list
> 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