[Gmsh] UNV information and problematic example

[Christophe Geuzaine]

Francisco Pena wrote:
> Hi all,
> 
> I saw that some people in this list is interested in the UNV format. I
> have found some information in:
> 
> http://www.sdrl.uc.edu/universal-file-formats-for-modal-analysis-testing-1/file-format-storehouse/file-formats
> 
> By the way, I have made a simple example in gmsh 2.3.1 (in a Mac). I
> constructed a 2D square [0, 1] x [0, 1] and created a physical group
> composed of the lower line. The idea is to detect the edges belonging
> to the physical group in order to specify boundary conditions in a
> external solver.
> 
> When I export the mesh to UNV (activating options "save all" and "save
> groups"), the dataset 2477 include 8 finite elements in PERMANENT
> GROUP1:
> 
>          7        10         0         0         7         5         0         0
>          7         2         0         0         7         8         0         0
>          7         6         0         0         7         9         0         0
>          7         1         0         0         7         7         0         0
> 
> That is, elements n. 1, 2, 5, 6, 7, 8, 9 and 10. My questions are:
> 
> a) Why are the elements 1 and 2 in PERMANENT GROUP1 since these
> elements do not exist in dataset 2412? In fact, element IDs in dataset
> 2412 start on 5.
> 
> b) The rest of the elements 5,6,7,8,9 and 10, are correct (they lay on
> the physical group) but the last element that belongs to the physical
> group (n. 11) is missing in PERMANENT GROUP1!
> 
> Thanks for your help. I attached the GEO and UNV files to this e-mail.


The "save groups" option for UNV saves groups of nodes, not groups of 
elements...

I'm not sure if this is the right way to go, but this was what all our 
UNV users asked for ;-)


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