GMNA reference solution: LPF = 1.2. Regarding the imperfection definition, there are no conclusive definitions for the amplitude, but the GMNIA reference LPF is about 1.0.
Can you share your model, the *.inp would be enough.
Yeah, this one (it was necessary to release rotational DOFs to make contact converge even though it worked in older releases of CalculiX): Contact of two shell pipes - no convergence in newer ccx releases - CalculiX (official versions are on www.calculix.de, the official GitHub repository is at https://github.com/Dhondtguido/CalculiX).
I often have warnings that someone’s file was created in another version (fortunately, it says which one) and either it doesn’t open at all if the versions is very different, opens with some issues due to incompatiboe features or just opens fully. Maybe I had a case that the file was created in the same version I was using to open it (Matej still provides old versions so you can often adapt to that) and there was still an issue, but it’s very rare.
Was it a long time ago ?
GMNA=1.17. I can only estimate it measuring in a pdf. GMNA is one of the values on which there was most agreement among the different analysts.
I can’t find it.
I think there are.
I hope you could still review your submission and help CCX/Prepomax receive a fair overall review in the RR3 Tower Finite Element Benchmark (Part 3 – Software Survey).
The transfer includes the GMNA setup; MNA can be obtained by simply removing the NLGEOM option.
Will be available three days.
EDITED: can–> Could. Sorry about my poor English. I forgot can is rude 
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crazy, now it also works on my full 3D Solid model, I just removed the rigid body constraint from the bottom, thats it nothing else, I will update my Report on the RR3 and inform Dr. Sadowski that I need a few more days for my Report. Will also upload a video regarding this analysis to my Youtube Channel.
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Yeah, it’s just that nasty “rigid body + Nlgeom + shells = non-convergence” limitation of CalculiX. It’s explained by the CalculiX dev here: Rigid-body constraint convergance problems - #25 by dhondt - CalculiX (official versions are on www.calculix.de, the official GitHub repository is at https://github.com/Dhondtguido/CalculiX).
Here you can find a list of various CalculiX limitations with workarounds: Known CalculiX limitations
Ooh, I missed the timing on this one! Congratulations everyone involved, it is always nice to see benchmarks being succesfully tested and even better when CCX gives good results.
When I was using data from old NACA reports, I discovered a good tool to extract more or less precise values from printed plots: PlotDigitizer Online App. Might be useful 
Best regards,
Lucas
Personally, I prefer desktop apps, and so I use open-source Plot Digitizer for that: https://plotdigitizer.sourceforge.net/
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