[Gmsh] Prism second order element error

[Christophe Geuzaine]

> On 8 Oct 2019, at 18:40, Luca Verzeroli <l.verzeroli at studenti.unibg.it> wrote:
> 
> Hi,
> 
> I'm trying to generate a mesh with second order elements. 
> 
> I managed to create this mesh
> 
> <emoieiopeopahiik.png>
> 
> 
> 
> <oehigcpkjelabbjm.png>
> 
> generating the external surface and then extruding the mesh inside.
> 
> This is ok using 1st order element. Using 2 order element the following warnig appears:
> 
> <egikpgdkhghakbhc.png>
> 
> I looked at the mesh and I noticed this
> 
> <cjnogopkfhpoaolh.png>
> 
> instead of 
> 
> <clkmoogodjjoopmp.png>
> 
> as using the 1st order. 
> 
> That element are prisms. Is there a problem with this kind of element?

No, probably with the underlying parametrization of the 3-sided surfaces defined by transfinite interpolation in the built-in geometry kernel.

Switching to the OpenCASCADE kernel should fix this.

Christophe


> 
> I'm using Gmsh version 4.4.0
> 
> -- 
> Luca Verzeroli
> 
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— 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://www.montefiore.ulg.ac.be/~geuzaine