[Gmsh] 2nd order tetrahedral elements in Gmsh

[Christophe Geuzaine]

On 09/05/11 12:00, Serban.Georgescu at uk.fujitsu.com wrote:
> Dear all,
>
> I have recently started using Gmsh and I’ve bumped into the following
> problem. I hope there is someone who can help me sort it out.
>
> As far as I know, the usual way of generating 2^nd order tetrahedral
> elements is to add a new degree of freedom in the middle of every edge
> of a 1^st order element. From what I see, in the case of the 2^nd order
> meshes generated using Gmsh, these middle nodes are moved from their
> default location, e.g. in order to better approximate a curved boundary.
> I know this is a good feature, but the FEM solver that I am using does
> not support such elements.
>
> Is there a way to turn this feature off? What I mean is, is there a way
> to generate “usual” meshes, with the middle nodes positioned exactly in
> the middle of the edges?
>


Hi Serban - Yes: just add "Mesh.SecondOrderLinear=1;" in your script file.

> Thanks!
>
> Serban
>
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-- 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science
http://www.montefiore.ulg.ac.be/~geuzaine