Recreating perpendicular flap case using CalculiX and OpenFOAM

Non-preCICE
1

Hello
I am trying to recreate the perpendicular flap just like a few others on this discourse however, my issue comes down to the setup of the solid side.
I made the flap first and then applied a fixture to the bottom. Am I supposed to apply a force or pressure on the interface surfaces? The tutorial .inp file has a *CLOAD but all values are set to zero. I tried generating the file first in Salome and then also in FreeCAD but my files do not match the tutorial case.
What are the exact boundary conditions that I should apply when using one of these softwares rather than cgx?

Also, when using FreeCAD I tried applying a force of zero magnitude but it did not accept this. I then tried to see what the .inp file would look like if I applied a force on the interface surfaces of 1 N and found that the boundary condition is distributed on each node somehow. This did not look as straightforward as the tutorial set up.
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Would appreciate any help.

2

Hi,

The adapter requires applying loads on node sets (or face sets depending on the data), not on individual nodes. For instance, in the tutorial example, it is defined as

*NSET,NSET=Nsurface 
1, 
4, 
5, 
8, 
10, 
12, 
14, 
16, 
18, 
20, 
22, 
24, 
26, 
28, 
30, 
32, 
34, 
36, 
38, 
40, 
42, 
44, 
46, 
48, 
50, 
[... many more until 738]

And then the force is applied to the node set:

*CLOAD
 Nsurface, 1, 0.0
 Nsurface, 2, 0.0
 Nsurface, 3, 0.0

I don’t know how to define sets in FreeCAD, but in the worst case you could write a script that reads all the nodes with a CLOAD on it and assemble this in a node set.

Hope it helps!

3

Hi @boris-martin
Thank you for your response. Yes I have been trying to make node sets using FreeCAD but have not been able to. Let me try compiling a script as well as reaching out to members on the CalculiX platform to find a solution.

Thanks again

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