TBD

There may be some issues with compiling MYSTRAN in Windows. While it appears to be resolvable, can we make this either (a) more bullet-proof or (b) provide some instructions in the trouble shooting section of the build MD here: https://github.com/MYSTRANsolver/MYSTRAN...n/BUILD.md

From the Fortran forum, there is this thread, and the following notable comments:
https://fortran-lang.discourse.group/t/f...er/4529/13

• As suggested I tried building via MSYS2 (or rather MinGW-w64). That failed because despite a message that CMake 3.23 would be installed, I am stuck with CMake 3.17.
  
• Instead, I switched to Cygwin, which does have an up-to-date version on my machine.
  
• The configuration step started, but then I got a complaint that submodules had not been downloaded. No indication of what submodules are to be downloaded. There is no indication in the BUILD.md file either.
  
• A quick check of the MakeLists.txt file showed a few packages are needed, but there is no information that I can see about where to get the various packages.
  
• I was also surprised to see f2c - is that really necessary?
  
• The information in BUILD.md suggests though the script will do it. Is that outdated information?
  
  

While the forums may still be used (for more complex inquiries), the majority of discussions have moved to our Discord server:
https://discord.gg/9k76SkHpHM

ACTIONS:
https://github.com/MYSTRANsolver/MYSTRAN...Actions.md

CHANGE LOG:
Add all changes here (code, compiling, documentation, benchmark, etc.,). Some of this information is later filtered to the appropriate documents after an official release. But this is the MASTER log for developers to add notes to.
https://github.com/MYSTRANsolver/MYSTRAN...angeLog.md

The majority of the documents have been updated and organized. They are found in the Documentation repository here

https://github.com/MYSTRANsolver/MYSTRAN_Documentation

For Pre/Post Options for MYSTRAN, see this thread in the "Pre/Post Processors" forum:

https://www.mystran.com/forums/showthread.php?tid=14

14.0.1 to Date
TBD

14.0 to 14.0.1
Updated Source/LK9/L92/OFP3_ELFE_1D.f90 to place OGEL writes bush results regardless of the type of bush

From the "SB-ALL-ELEM-TEST.DAT" test model, we noticed that on line 507 (in the attached image), that the Force is incorrect. It should be 2.55E+03 and not 0.0. However, note that upstream from this, the current version reports the correct result. So it may be that the issue has to do with how MYSTRAN is reporting the results.

By reviewing the different MYSTRAN builds, this bug looks to have been introduced in Version 13.2. This means approximately between Aug 10, 2021 and Aug 29, 2021 (but those dates are approximately and not exactly the dates that correspond to the code). However, there is a relatively small window for when the code was written that introduced this bug. I believe Bill was working on the BUSH element updates and maybe something occurred during that effort.

MYSTRAN Version 10.31    May 14 2020 – OK
MYSTRAN Version 12.2    Apr 26 2021 – OK
MYSTRAN Version 12.2    Apr 26 2021 – OK
MYSTRAN Version 12.1    Feb 12 2021 – OK
MYSTRAN Version 13.1    Aug 10 2021 – OK
MYSTRAN Version 13.2    Aug 29 2021 – Bug Noted
MYSTRAN Version 13.3                         – Bug Noted
MYSTRAN Version 14.0    Sep 07 2022 - Bug Noted

Attached Files

Thumbnail(s)
   

  SB-ALL-ELEM-TEST.zip (Size: 1.17 KB / Downloads: 2)

1 - One of the highest priorities (if not the highest) for MYSTRAN is to improve the shell elements and add shell buckling. There are currently 2 quad element options in MYSTRAN now, but both have limitations. MYSTRAN can not do buckling for shell elements (but it can do buckling for all other elements).

2 - A developer of another FE solver has incorporated the MITC shells into his code (3, 4, 6, and 8-noded). These are Bathe's formulation and are quite popular. He also developed the code shell buckling so we can use that code as reference. However, all if this code is in VB (Visual Basic) and I believe some C++. He has provided the code to me, but it is not for public use. It is only for developers and we need to make our own Fortran version. He said he used a lot of information from the following link and can assist us.
https://www.sesamx.io/blog/shell_finite_element/

3 - The open source solver CalculiX has developed a MITC 3-noded tri. Since this is coded in Fortran, it be useful to view this code.

4 - Harry Schaeffer helped Dick MacNeal develop shell elements for MSC. Harry developed his own variation of NASTRAN-95, which is known as ComLab. But there are some challenges with redistribution and maintenance of that program. Harry is assisting us by adding his 3-node tri and 4-node quad (and improved solids) to MYSTRAN. I believe he is also going to add shell buckling as well. There is no time frame to completion, but his code may be useful for adding the MITC elements.

5 - Cean has some notes for adding the drilling DOF stiffness (K6ROT) in the following link. MYSTRAN does not have K6ROT, but the developers think it would be a good idea to add it. Here is a PDF:
https://www.mystran.com/misc/Adding_PARA...Update.pdf

If you would like to help, post here or in the Discord channel: https://discord.com/invite/fUJr75H

PRIMARY AUTHOR: Dr. Bill Case was a member of the project management team for the development of the popular NASTRAN finite element analysis computer program developed in the late 1960's and early 1970's for the National Aeronautics and Space Administration (NASA). Over the course of 30 plus years from that time he was a structural analyst using NASTRAN and subsequently the head of an analysis branch comprised of approximately 20 analysts who used NASTRAN on many of the spaceflight structures built or managed by NASA Goddard Space Flight Center (GSFC). He taught many graduate level courses in the area of static and dynamic structural analysis as well as basic and advanced courses in the use of NASTRAN. He was the author of many technical papers in the areas of finite element analyses and in the use of NASTRAN for major flight projects. MYSTRAN, formerly a commercial program, is now a community project.

Bill continued to work on the MYSTRAN source code until late 2021 when he passed away. Bill spent decades developing the MYSTRAN program and it was his wish for the project to continue. There are currently a community of developers that work on the program and we aim to honor his legacy. Thank you Bill for your contribution to the engineering community.