Gmsh Generation errors

[ando600]

I am new to Freecad, I have quite a bit of experience in Fusion360 and Inventor. So far I really like it, but I am having issues using the FEM workbench. I am on Ubuntu 22.04 LTS, and freecad 0.19.

I am having issues generating the mesh for the basic cube example on the FEM tutorial.
https://wiki.freecadweb.org/FEM_tutorial

Netgen does not show up as an option, that seemed to work better when I ran Freecad on my mac, but I tried ubuntu as I had calculix python errors.

When I use Gmesh on ubuntu, I get no errors, but the mesh looks messed up, seen in attached.

When I run the Calculix solver, I get error 201, nonpositive jacobian, which makes sense looking at the mesh generated.

Any help is appreciated.

Thanks,
Andrew

[chrisb]

Moved from Help forum.

[fandaL]

As a first step, I would update FreeCAD to 0.20.1, In the way you installed it, e.g. through the Ubuntu Software Center, or download the AppImage from https://www.freecadweb.org/downloads.php

[user1234]

I am on Ubuntu 22.04 LTS, and freecad 0.19.

Looks like a vtk FreeCAD incompatibility. If you post your FreeCAD info (see red banner on the top of the site), we know more.

Greetings
user1234

[NewJoker]

freecad 0.19

As far as the FEM module is considered, this version is really outdated. Try with 0.20.1 or (even better) 0.21 dev.

[ando600]

Ok I will update Freecad and see if that works. I am not sure why the version is outdated, I just used apt install free cad.
Thanks for all the replies.

[bernd]

FreeCAD development is much faster than Debian or Ubuntu development. A year in FreeCAd changes and fixes a lot ATM.

[bernd]

...
Netgen does not show up as an option, that seemed to work better when I ran Freecad on my mac, but I tried ubuntu as I had calculix python errors.
...

FreeCAD FEM should run on Mac without any problems if you are able to install ccx and GMSH on Mac.

I'd be really interested in them and like to fix them if it really was a FreeCAD problem.