Speed up contact convergence

Does anyone know a way to speed up contact convergence in SOL 101 or 400? I'm finding that MSC Nastran takes 30-40 times as long as NX Nastran to solve the same linear static problem (linear other than the fact that contact is present). Does everyone use the default settings or are there some known knobs to tweak that help performance?

Thanks!

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0 Kiranraj Shetty over 2 years ago
Hi David,

Here are a few tips that could help in improving the performance of a contact simulation,

Switch to segtoseg contact if you are using nodetoseg contact It can be done using METHOD SEGTOSEG in the BCPARA card.

If you have all glue contact pairs, please use NLGLUE,0 in BCPARA

In the sol400 deck turn off all advanced elements by removing PSLDN1, PSHLN1, PBEMN1 etc..

In sol101 use LCNT in the NLSTEP card ex:

NLSTEP,1

,LCNT,10,PVA,.1,.1,

Where 10 is the number of increments, you can change the number of increments depending on the problem.

Regards,

Kiran
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0 Kiranraj Shetty over 2 years ago
Hi David,

Here are a few tips that could help in improving the performance of a contact simulation,

Switch to segtoseg contact if you are using nodetoseg contact It can be done using METHOD SEGTOSEG in the BCPARA card.

If you have all glue contact pairs, please use NLGLUE,0 in BCPARA

In the sol400 deck turn off all advanced elements by removing PSLDN1, PSHLN1, PBEMN1 etc..

In sol101 use LCNT in the NLSTEP card ex:

NLSTEP,1

,LCNT,10,PVA,.1,.1,

Where 10 is the number of increments, you can change the number of increments depending on the problem.

Regards,

Kiran
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