[Gmsh] 2D meshing pecularities

[Christophe Geuzaine]

Christophe Geuzaine wrote:
> 
> "Pascal A. Dupuis" wrote:
> >
> > Hello,
> >
> > I am trying to nail down a 2D meshing problem; here is a minimal test case.
> > I have a geometry mostly done of half cyliders. To verify the design coherency,
> > I regulary generate a 2D meshing: in this case, most are 'ruled surface'
> > delimited by two lines and two half circles. As it appears, the intermediate
> > points generated on the ruled surface are incorrect and seems to fall outside
> > the surface. The following commands illustrate this behaviour:
> 
> Yes, this is normal (!). You cannot define surfaces for which the plane
> projection is degenerate (cf. FAQ 5.2). In your case, you should not use
> half circles, but only arcs having an angle smaller than 2*Pi.
                                              ^^^^^^^^^^^^^^^^^
You should read "smaller than Pi", of course.

Christophe

-- 
Christophe Geuzaine

Tel: (626) 395-4552    http://www.geuz.org
Fax: (626) 578-0124    mailto:geuzaine at acm.caltech.edu