Using mystran ( https://www.mystran.com/) to solve.
This case is from MYSTRAN-FEA-Program-ver-10.2/3_TestRuns/Eigens/Banded/CurrentRuns/AQ3U2S004-GIV.dat
Moderator: bernd
Read result into fc FEM format.
I am using pyNASTRAN to input case and result file. This is its model and my second inputed. I also have my own one, but very limited. Nastran is so compilicated.