[Gmsh] second order elements postprocessing

[Christophe Geuzaine]

> On 8 Oct 2018, at 10:50, andycapo at virgilio.it wrote:
> 
>> 
>> Il 6 ottobre 2018 alle 15.53 Christophe Geuzaine <cgeuzaine at uliege.be> ha scritto:
>> 
>>> On 3 Oct 2018, at 11:22, andycapo at virgilio.it wrote:
>>> 
>>> Dear gmsh authors,
>>> 
>>> I'm trying to post-process the results of a code-aster simulation (essentially the "skin" of circular columns TRIA6 elements).
>>> 
>>> The results file is in med format, and gmsh is 4.0.2.
>>> 
>>> If I open the file I can see
>>> 
>>> *   the curved surfaces if I plot the mesh (correct)
>>> 
>>> *   but in the post processing, the mesh is "linear" (I would expect 2nd order results)
>> 
>> -> Choose "Adapt visualization grid" in the view option + select the max recursion level/target error (error < 0 forces refinement).
>> 
> 
> Thank you Christophe, the option reconstructs the geometry. Is the reconstruction purely geometric, or does reconstruct also the fields based on high order shape functions (in this simulation I used 6-nodes triangles, so the reconstruction may be performed with quadratic shape functions, accounting for the internal nodes)?

It uses the shape functions - in your case isoparametric P2 triangles.

(Gmsh allows you to provide explicitly the basis functions for the interpolation both of the geometry and of the field. But you would need to use the Gmsh post-processing format for this, not MED.)

Christophe

> Thank you
> A.
> 
>>> Thanks in advance
>>> 
>>> A.
>>> 
>>> <mesh.PNG><post.PNG>_______________________________________________
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>> 
>> —
>> 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
> <0.PNG><3a.PNG>

— 
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