Plotting results per element

About the development of the FEM module/workbench.

Moderator: bernd

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bernd
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Re: Plotting results per element

Postby bernd » Fri Oct 05, 2018 1:48 pm

makkemal wrote:
Fri Oct 05, 2018 9:57 am
But I fudge the results to nodes in the script above.
I think the datfilereading section is use ful but only once plotting data per element is avaiable.
For this we would need to plot them in integration points of the FEM element?
ickby
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Re: Plotting results per element

Postby ickby » Mon Oct 08, 2018 6:21 am

As a side note, vtk data structures support element data out of the box (called cell data). So at least storing is super easy. However, i'm unsure how well the freecad implementation for plotting works, I never tested it for cell data. It is considered at some points in the code, like here.
makkemal
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Re: Plotting results per element

Postby makkemal » Wed Oct 10, 2018 10:57 am

For this we would need to plot them in integration points of the FEM element?
i think averaging integration point per element would be sufficient. This is how most commercial packages do it.
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bernd
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Re: Plotting results per element

Postby bernd » Wed Oct 10, 2018 6:56 pm

to keep this ... issue #3633
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HarryvL
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Re: Plotting results per element

Postby HarryvL » Fri Oct 12, 2018 9:53 am

makkemal wrote:
Wed Oct 10, 2018 10:57 am
For this we would need to plot them in integration points of the FEM element?
i think averaging integration point per element would be sufficient. This is how most commercial packages do it.
@makkemal as reported here:

https://forum.freecadweb.org/viewtopic. ... 10#p217518

and here:

https://forum.freecadweb.org/viewtopic. ... 31#p220381

averaged integration point results can introduce big errors. So although it may be ok for illustration purposes, it may not be advisable for engineering/design purposes. It would be really useful to get raw tabulated dat file output for a single element by simply clicking on it.