What is SYSTEM(216)?

I recently started using Patran/Nastran 2018. I just noticed that my nastran input files now have the following command at the top: NASTRAN SYSTEM(216)=YES. I do not recall seeing that with previous patran/nastran versions. Unfortunately, I cannot find this particular system cell documented in the QRG or any other manual.

Please tell me why there is no mention of system cell 216 in the QRG or any other version 2018 manual. I would like to know what this command is doing and if it is necessary. I expect all commands to be documented in your manual. Am I expecting too much?

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0 Don.Graff over 6 years ago

Hi Toby,

I found what this does... it relates to the iterative solver, so if Patran is writing it out, I suspect you have chosen the iterative solver instead of the default?

Here is a description:

system(216) keyword=ITER type=Integer

Controls execution of iterative solver in SOLs 1, 8, 11, 101, 108, 111 and 106.

1 or YES: Execute iterative solver.

0 or NO: Do not execute iterative solver (Default).

You can also control the iterative solver using the SMETHOD/ITER case control/bulk data command.

Don
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0 Don.Graff over 6 years ago

Hi Toby,

I found what this does... it relates to the iterative solver, so if Patran is writing it out, I suspect you have chosen the iterative solver instead of the default?

Here is a description:

system(216) keyword=ITER type=Integer

Controls execution of iterative solver in SOLs 1, 8, 11, 101, 108, 111 and 106.

1 or YES: Execute iterative solver.

0 or NO: Do not execute iterative solver (Default).

You can also control the iterative solver using the SMETHOD/ITER case control/bulk data command.

Don
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