[Gmsh] a problem about the node ordering

[Jeremy Theler]

AFAI, rotations should not give rise to singularities in the jacobian.
In fact, these orderings are equivalents as you state, they give the
same normals following the "right-hand rule".



On Mon, 2016-11-14 at 11:04 +0100, Nan Li wrote:
> Hello everyone,
> 
> 
> I met a problem about the node ordering. I use typical 4 nodes
> rectangle element and I find in some region of my mesh the element is
> not ordering by the typical style
> 3-----------2
> |               |
> |               |
> |               |
> 0-----------1
> but 
> 2-----------1
> |               |
> |               |
> |               |
> 3-----------0. 
> This leads to singularity of my Jacobian matrix.  
> For example, element 2358 (2225 2226 2235 2234) in the document .msh. 
> 
> 
> I have checked the normal direction of my surface and there is no
> problem. 
> 
> 
> Thank you very much. 
> 
> 
> Li Nan
> Doctorante
> Laboratoire Roberval
> Université de Technologie de Compiègne, France
> Email: nan.li at utc.fr
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