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How to perform implicit nonlinear transient analysis using NP in Optistruct

I have a model that is undergoing nonlinear implicit transient analysis with a lot of frictional contact. I have tested that when using nt without np, the results converge. However, when I enable np, the calculation will report an error in the initial analysis step. What is the reason for this? How to use np correctly to speed up the calculation?

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Alberto Campagna

Hi,

please post .out/.stat files with the error.

Alberto

Jin1

The first image is calculated using NP, but solving it will directly pop up this and then end the calculation.
In another calculation, I used finite slip and AUTO for contact stiffness, but it was found that model penetration occurred during the calculation. Should I change the contact stiffness to hard and the finite slip to continuous slip?

Alberto Campagna

Hi,

upload the entire files, there is no way to determine the reason of the error from this screenshot and also the version of the solver.

Alberto