[Gmsh] Stress on Gauss Points

[Max Orok]

Hi Gaetano,

I think this script will work with Anaconda -> you'll need to make sure the
gmsh package is installed and that it is a compatible version (< 4.0).
The reason I'm using python is to call gmsh functions, but these are also
available in Julia, a language more similar to MATLAB I believe.

For the displacement, does it seem like it aligns? I don't want to make a
mistake in interpreting the data.

Jeremy,

You're right, there isn't any explicit averaging going on, it just goes
through all the nodes and assigns values based on their number.
After assigning I trusted Gmsh to display them nicely :):)

This does mean that node data values are set multiple times -> to the same
value (magnitude at least).
A lot of the data on each row is duplicated elsewhere in the file, my idea
was that if the elements were ordered correctly, the
repeated overwrite wouldn't matter as long as the overwrite contained the
same number.

Sincerely,
Max

On Thu, Feb 14, 2019 at 7:56 AM Jeremy Theler <jeremy at seamplex.com> wrote:

> Hey Max
>
> I am also interested in this issue. I did not fully understand your script.
> Are you averaging the stresses at the gauss points over the nodes? If so,
> where and how?
> The same goes for the nodal forces, that are given at the nodes but
> locally for each element.
>
> How come you end up with 125 nodal values from the 512 initial values?
>
> Any further explanation will be appreciated.
>
> --
> jeremy theler
> www.seamplex.com
>
>
> On Wed, 2019-02-13 at 19:31 -0500, Max Orok wrote:
>
>
> Hi Gaetano,
>
> Here is a small python script that tries to plot these data along with the
> mesh results file.
> I assumed the node forces were for the given elements, in the order gmsh
> is expecting.
>
> Here are some pictures -> hopefully it is something like you were
> predicting.
> To an outsider, they look pretty good!
>
> [image: image.png]
> [image: image.png]
>
> Sincerely,
> Max
>
> On Wed, Feb 13, 2019 at 8:02 AM Gaetano Camarda <gaetano_18 at live.it>
> wrote:
>
>
>
> Hello, I have an issue with postprocessing on Gmsh, I created a mesh on
> Gmsh, and I’ve imported it on Matlab, for some analysis,
>
> now I have the displacement of my mesh and I’m able to import it on the
> .msh file and post-processing the view on Gmsh.
>
> I have also 2 matrix, one with stress calculated on Gauss Points (I used
> 2) and one with nodal force of the element in each row.
>
> I would like to view the stress and nodal force in Gmsh, as I do with
> displacement. But I do not know how to do it.
>
> I’ve worked with Hexahedral.
>
> I’m attatching also the file of the mesh, and the files with stress on
> gauss point and nodal forces.
>
>
>
> (please remove .txt from 10cm.msh)
>
> Inviato da Posta <https://go.microsoft.com/fwlink/?LinkId=550986> per
> Windows 10
>
>
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>
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>

-- 
Max Orok
Contractor
www.mevex.com
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