Is it possible to combine gmsh ?

[jcerro]

Hi everyone,

Thank you for the great job you made on Freecad, it's amazing to see how much can be done when you have passion.

I'm trying to do some simple FEM analysis on a camera support arm, like gravity effect or side push. It is aimed to carry a small webcam over a soccer-table to perform ball tracking. I've designed the arm using multiple single parts, and then assemble them using Assembly2 workbench.

The problem I'm now facing is that it seems impossible to select multiple parts of an assembly to create one mesh using gmsh, neither to combine multiple already created gmsh from the parts in assembly.

The only solution I found by now is to create a muxed assembly, but I can't create 3D elements, neither with netgen of gmsh, and I'm afraided it might create some link between parts that have DoF one to another.

I hope I explained my issu clearly enough.

Thank you all !

OS: Windows 10
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.17.13541 (Git)
Build type: Release
Branch: releases/FreeCAD-0-17
Hash: 9948ee4f1570df9216862a79705afb367b2c6ffb
Python version: 2.7.14
Qt version: 4.8.7
Coin version: 4.0.0a
OCC version: 7.2.0
Locale: French/France (fr_FR)

[chrisb]

Moved to FEM forum.

[bernd]

would you post a simple example file from your problem? This makes it much more easier to talk about your problem.

bernd

[jcerro]

No problem,

Please find attached an archive with all the files of the assembly, and the so-called assembly, here called calc.FCStd.

Thank you !

[jcerro]

Hi,

I was wondering if the multiple mesh analysis will be supported ? The pop-up window says that it is not supported YET ? Have you intels about thats ?

Thank you !

[bernd]

I was wondering if the multiple mesh analysis will be supported ? The pop-up window says that it is not supported YET ? Have you intels about thats ?

No multiple meshes are not supported at all ATM. But you can do one mesh from multiple bodies without any problems.

BTW file and screen of the nice arm attached for others to try too. In FEM we love screens It woll not easy to make a mesh out of this detailed geometry. It might be much more easier to simplify the geometry for an analysis. Might be even simpler by pen and paper because it is just a cantilever and only make a analysis for the several parts.

But I will give it a try to mesh anyway ...

calc.FCStd

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screen.jpg (78.23 KiB) Viewed 952 times

[bernd]

Another possibility would be to use some development branch, which exactly trys to solve this problem ... https://forum.freecadweb.org/viewtopic. ... 00#p261413 and the branch to test would be https://github.com/berndhahnebach/FreeC ... utocontact