[Gmsh] Single element normal

[Christophe Geuzaine]

> On 23 Jun 2020, at 19:44, Sabrina Zacarias <szacarias at ikp.tu-darmstadt.de> wrote:
> 
> Dear all, 
> 
> I am working on a 2D model in which I would like all the mesh normals to be pointing in the same direction. As I visualize them, I noticed that there is a single element from a single surface pointing in opposite direction to the rest. Does anyone know what it means and if there is a way to fix it? 
> 

Difficult to say without a test case...

> 
> An additional point, if I may, is that after setting the boundary conditions and physical surfaces of my model and solving the electrostatic field with Elmerfem, the result I get is either right or wrong (in terms that not even the boundary conditions have the values that they should) depending on the type of mesh that I use (either 2nd order triangles, which gives me the right solution, or 8-node quadrangles, which doesn't and unfortunately this one is the one that I must use). 
> 

Idem.

Christophe

> I would appreciate any help or suggestion that you may have. 
> 
> Best regards, 
> 
> Sabrina
> 
> --  
> Sabrina Zacarias
> Institut für Kernphysik
> Technische Universität Darmstadt
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> Schlossgartenstr. 9
> 64289 Darmstadt
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— 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://www.montefiore.ulg.ac.be/~geuzaine