[Dune] How to change vertex numbering order?

[Ranjeet Singh]

Hi Jö,
Thank you for your reply.  I am just learning FEM. The book I am following
uses cyclic numbering for the quadrilateral elements. So I thought if any
way I can get cyclic numbering then I can easily verify the element
stiffness matrix with book examples.  Also, I spent hours to figure out the
quadrature domain is not -1 to 1.   It will be very helpful if you could
recommend me some FEM book has lot of problem examples and follows the dune
convention such as vertex numbering, quadrature domain.

Thank you!

Kind regards,
Ranjeet



On Fri, Aug 16, 2019 at 5:35 PM Jö Fahlke <jorrit at jorrit.de> wrote:

> Am Fr, 16. Aug 2019, 13:43:40 +1000 schrieb Ranjeet Singh:
> > Is there any way to change the vertex numbering to cyclic order?
>
> [I'm assuming you're talking about quadrilateral elements here]
>
> No, the numbering of vertices within an element follows a fixed convention,
> see
>
> https://dune-project.org/doxygen/master/group__GeometryReferenceElements.html
> .
> The reason is that there is a dimension-independent way to construct that
> numbering, which is difficult to do with cyclic numbering.
>
> What do you need a specific numbering for?  If it is for interfacing with a
> library that follows a different numbering convention, the way to go is
> usually to write a small function to transform between the numberings for
> your
> specific case.
>
> Regards,
> Jö.
>
>
> --
> Jorrit (Jö) Fahlke, Institute for Computational und Applied Mathematics,
> University of Münster, Orleans-Ring 10, D-48149 Münster
> Tel: +49 251 83 35146 Fax: +49 251 83 32729
>
>
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