FEM: Add basic ccx 1D fluid network example

[FEA-eng]

Adds the first FEM Example for CalculiX's 1D fluid network functionality

@marioalexis84 FYI

[FEA-eng]

@marioalexis84 I used the old ccx solver on purpose because postprocessing with it is much easier for the specific case of fluid networks.

[marioalexis84]

Note that the new solver shows the result properly in the pipeline. The old solver not.
What do you need in the new solver? The max and min values, like in the results object task panel?

[FEA-eng]

What do you need in the new solver? The max and min values, like in the results object task panel?

Yes, I use the task panel of the old results object for these fluid network analyses. It’s the quickest way to check their results since the output of such 1D flow calculation is just pressure and mass flow rate at the outlet vs the corresponding inputs at the inlet (the main goal is to evaluate the pressure drop).

In fact, this keyword would also provide all the needed info here:

*NODE PRINT, NSET=Nall
U

But we don’t support it yet and it has to be interpreted carefully (since the results aren’t really displacements in this case).

[marioalexis84]

Please, fix the * position at the end

[FEA-eng]

Sure, done

[FEA-eng]

@maxwxyz This one is approved