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09-27-2016 09:28 AM

Hello Experts,

often I start NX nastran via command line. I wonder if there is an option to make NX using the iterative solver in SOL101.

I found sys442=1 but I'm not sure if its the the right one.

Nastran help started with "!UGII_BASE_DIR!\NXNASTRAN\bin\nastran64L.exe help all"

did not provide that commad option but it was the difference in LOG-FILE when I started my solution from NX program surface interactively.

Or is it a parameter setting in dat file which has to be activated for iterative solver?

Any suggestions will help, best wishes

Michael

Solved! Go to Solution.

5 REPLIES

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09-27-2016 10:03 AM

sys442 controls the Solution Monitor for runs launched from NX. It has no effect on the iterative solver.

To activate the global iterative solver, you would set sys216=yes

To activate the element iterative solver, you would set sys216=yes and sys399=yes

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09-27-2016 12:32 PM

JimB, I will try it. Thank you. Michael

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09-28-2016 02:00 AM

I did re-solve my model with modified command line options as you recommended, thank you.

But now I'm not sure if it did work. - Can I recognize i.g. in log file or f06 file if the solver was the iterative one?

(My f06 file is very large - more than 1GB - and its difficult to open it.)

Best wishes, Michael

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09-30-2016 09:58 AM

If the element iterative solver is used, the .fo6 file will contain the following summary table:

I T E R A T I V E S O L U T I O N S U M M A R Y NUMBER OF EQUATIONS = 1746 NUMBER OF NONZEROS IN STIFFNESS MATRIX = 42642 NUMBER OF NONZEROS IN PRECONDITIONER = 36579 PRECONDITIONER SELECTED = STANDARD NUMBER OF ITERATIONS = 20 CONVERGENCE CRITERIA USED = AREX CONVERGENCE TOLERANCE USED = 1.00E-08 MEMORY AVAILABLE = 8816 MB MEMORY USED IN CG ITERS = 1 MB CG WORKING SET SIZE = 0 MB IF MATRIX OUTOFCORE SCRATCH FILE DISK SPACE = 1 MB MULTIPLY MEGAFLOP RATE = 0 SOLVE MEGAFLOP RATE = 0

If the .f06 is too large to open, you can also look for the following in the .log file:

******************************************************************************** * * * PCGLSS 8.0: Linear Equations Solver * * * *(C) Copyright 1992-2011 Computational Applications and System Integration Inc.* * All rights Reserved. * * * * CASI, 2001 South First Street, Champaign, IL 61820. * * Ph (217)244-7875 * * Fax (217)244-7874 * * * * CASI DOES NOT GUARANTEE THE CORRECTNESS OR USEFULNESS OF THE RESULTS * * OBTAINED USING PCGLSS. CASI IS NOT LIABLE FOR ANY CONCLUSIONS OR ACTIONS * * BASED ON THE RESULTS. IT IS THE RESPONSIBILITY OF THE USER TO CONFIRM THE * * ACCURACY AND USEFULNESS OF THE RESULTS. * * * ********************************************************************************

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09-30-2016 10:02 AM

Dear JimB, now I'm happy, thank you. Best wishes, Michael

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