[Gmsh] a problem about the node ordering

[Guido Giuntoli]

Hi Nan, I agree with Jeremy try to see if you are multiplying wrong the
shape functions' gradients (for example the 2nd shape function gradient
with the coordinates of the 3rd vertex). If you are using a close code the
only solution that is in my mind is to do a program to reedit the .msh as
you wish.


2016-11-14 20:04 GMT+01:00 Jeremy Theler <jeremy at seamplex.com>:

> 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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>
>
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