FEM with variable boundaries

About the development of the FEM module/workbench.

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MW57
Posts: 3
Joined: Mon Aug 03, 2020 8:07 pm

FEM with variable boundaries

Post by MW57 » Tue Aug 04, 2020 9:52 pm

Hello there !

I am new with FreeCAD. Can someone say me if it is possible to make FEM calculus with variable loads like for instance the evolution of the pressure along the axis of a solid rocket motor ?

Best regards,

MW57
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bernd
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Joined: Sun Sep 08, 2013 8:07 pm
Location: Zürich, Switzerland

Re: FEM with variable boundaries

Post by bernd » Wed Aug 05, 2020 10:31 am

MW57 wrote:
Tue Aug 04, 2020 9:52 pm
Hello there !

I am new with FreeCAD. ...
welcome to FreeCAD FEM. Make sure to read https://forum.freecadweb.org/viewtopic.php?f=18&t=12212


MW57 wrote:
Tue Aug 04, 2020 9:52 pm
... Can someone say me if it is possible to make FEM calculus with variable loads like for instance the evolution of the pressure along the axis of a solid rocket motor ?
Would you like to do one analysis which has a changing the load value along an axis, or would you like to do multiple analysis with changing load value in each analysis?

cheers bernd
MW57
Posts: 3
Joined: Mon Aug 03, 2020 8:07 pm

Re: FEM with variable boundaries

Post by MW57 » Wed Aug 05, 2020 2:42 pm

Hello,
I would like to do one analysis which has a changing of the load value along an axis. But additionally the burning surface of the propellant is evolving during time in a solid rocket motor. So I look for a solution to do CFD applied to this problem. Perhaps with OpenFOAM if it is possible to do geometry surfaces evolving during time and hence during calculus ?
Best Regards,
MW57
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bernd
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Location: Zürich, Switzerland

Re: FEM with variable boundaries

Post by bernd » Thu Aug 06, 2020 10:50 am

In the regard of CFD with OpenFoam you should make a post in OpenFoam part of the forum.

There is ATM no constraint to apply a load with changing value. You would have to do this manually by adding multiple constraints with different load values. I would start with rought values and only rare different values. If it works I would add as many constraints as needed but with Python. With a few lines of Python this is nearly as comfortable as with a Gui.
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