[Gmsh] 2nd order tetrahedral elements in Gmsh

[Serban.Georgescu at uk.fujitsu.com]

Hi Christophe,

Thanks for the very quick reply. This was exactly what I was looking for!

Cheers,
Serban

-----Original Message-----
From: Christophe Geuzaine [mailto:cgeuzaine at ulg.ac.be] 
Sent: 09 May 2011 11:20
To: Serban Georgescu
Cc: gmsh at geuz.org
Subject: Re: [Gmsh] 2nd order tetrahedral elements in Gmsh

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

______________________________________________________________________
                                        
 Fujitsu Laboratories of Europe Limited
 Hayes Park Central, Hayes End Road, Hayes, Middlesex, UB4 8FE
 Registered No. 4153469
 
 This e-mail and any attachments are for the sole use of addressee(s) and
 may contain information which is privileged and confidential. Unauthorised
 use or copying for disclosure is strictly prohibited. The fact that this
 e-mail has been scanned by Trendmicro Interscan does not guarantee that 
 it has not been intercepted or amended nor that it is virus-free.