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PREREQUISITES:
- A fortran compiler, gfortran will do. On Linux, Windows (mingw) and
on Android using CCTools.
- GNU make.
HOW TO USE:
1. Run make.
2. Avoid the "-" character, it will break nastran.
3. Place your problem file in the "test" directory. You'll finde
some in the "inp" directory.
4. Run from there ..\bin\nastran.sh xxx or on windows ..\bin\nastran.bat xxx
where xxx is your problem file (without the file extension). For
Android have a look at the android.sh script. For Android you have
to link the program statically, otherwise it will segfault.
ISSUES:
- This is really old stuff, unmaintained for over 20 years. Expect
something will break.
- There are some features missing in comparision to the commercial
Nastran versions. Some entities have different names.
E.g.: RBE3 <=> CRBE3
CHEXA <=> CIHEX1
- The CQUAD4 and especially the CIHEX1 (the Cosmic CHEXA) suffers from
shear locking. Two test cases are profided in the test directory.
This could be improved by implementing selective reduced integration
as it is described in the Fourteenth NASTRAN Users' Colloquium
(p. 28ff) and in: http://paginas.fe.up.pt/~rnatal/paper.pdf.
- There seems to be no corner stress output for the CQUAD4 element,
whereas it is calculated within the SQUD42 subroutine.
- There are no optimization capabilities, exept the FSD method as
shown in the NASTRAN DEMONSTRATION PROBLEM NO. D01-16-1A
- There is no predefined binary result output, as some users may be
used to PARAM,POST. Nevertheless it is possible to write an op2 file
via DMAP alters, which then can be read by common post-processing
software. Basically insert
OUTPUT2 "DATABLOCK",,,,//C,N,0/C,N,11////C,N,*MSC* $
after the OPF DMAP statement.
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