[Gmsh] set different order to different region of structure

[Christophe Geuzaine]

Dear Nan,

Normally this is not supported (Gmsh produces meshes of a given order globally). But in your specific case you can make it work by using a combination of "Mesh.MeshOnlyVisible" and "SetOrder": see attached file.

Christophe

-------------- next part --------------
A non-text attachment was scrubbed...
Name: mesh_hybrid_order.geo
Type: application/octet-stream
Size: 1663 bytes
Desc: not available
URL: <http://onelab.info/pipermail/gmsh/attachments/20160829/cbebd71c/attachment.geo>
-------------- next part --------------


> On 29 Aug 2016, at 19:35, Nan Li <linan88433189 at gmail.com> wrote:
> 
> Hello everyone,
>  
> I met a problem seems pretty simple but have bothered me for two days. 
> I have a structure constructed with beam and plate. So I want to use 1d element (for the beam) and 2d element (for of plate) at the same time in gmsh. As I have already programed in matlab an element 1d (order 1) with 2 nodes and an element 2d with 8 nodes (order 2), I want to use them directly. Then I find it difficult in gmsh to set different order to different region of my structure. If I use Mesh.ElementOrder =2; Mesh.SecondOrderIncomplete = 1, then the 1d element will have 3 nodes. If I delete these lines, the 2d element will have 4 nodes.
>  
> Does anyone have any idea on this question? 
>  
> Thank you very much. 
>  
> By the way, I use  gmsh 2.8.5 and the file .geo is in the attachment. This is only a simplified exemple of my structure. There is only three cells in this exemple and I plan to have 50 cells in x direction and 30 in y direction. 
> 
> -- 
> Li Nan
> Doctorante
> Laboratoire Roberval
> Universit? de Technologie de Compi?gne, France
> Email: nan.li at utc.fr
> <maillage_plaque_periodique_test.geo>_______________________________________________
> gmsh mailing list
> gmsh at onelab.info
> http://onelab.info/mailman/listinfo/gmsh

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

Free software: http://gmsh.info | http://getdp.info | http://onelab.info