Nastran Explicit Solver generates invalid solutions when manually run from command line

[peterECRSK]

I believe I've followed these instructions faithfully in attempting to run a stand-alone analysis.

https://www.autodesk.com/support/technical/article/caas/sfdcarticles/sfdcarticles/How-to-run-Nastran...

As far as I can tell, the Nastran file generated from the solver is identical whether it is manually triggered, or automatically in the process of running the simulation directly from Inventor. Additionally, I've verified the exact same executable file is being called from the Inventor UI as I am attempting to manually run from the command line.

Every time I import the results file (.fno) back into Inventor, the results are clearly non-sensical, and there is a (cut-off) warning: "Results may not be compatible with the..."

Nothing I've tried from the command line has been able to produce a valid result, and I have encountered this behavior with multiple versions of Inventor (now 2025.2.1)

When the exact same simulations are run from Inventor itself, everything works as expected. When the solver is triggered manually, it does not. There are no errors of any kind from the solver that indicate a problem.

[John_Holtz]

Hi @peterECRSK 

I think the warning symbol ! on the results may just be because of the time stamp of the file. That does not concern me.

Can you clarify what you mean by the results not making sense? For example, if you turn the displaced shape off and view the stress results, the displacement results, and so on, do the colors look correct? One oddity about loading existing results, the deformed shape may be using some other result (acceleration, contact force) as the vector that is used to show the deformed shape. In such cases, you can edit the contour ("Results > Options > Deform Options" from the ribbon) and choose the Displacement result as the vector result to use for the deformed shape.

This reminds me of another issue. If you did not output the displacement results, then Inventor cannot show the deformed shape!

John