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Is PARAM, EXPERTNL supported for Large Displacements?

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Hi all,

I read in the Altair ebook "Introduction to Nonlinear FEA using Optistruct" (free ebook for students) that EXPERTNL is currently not supported with large displacement nonlinear analysis. As this ebook is from 2018 I wanted to ask, if things have changed since? Is EXPERTNL supported with large displacement analysis in the 2019 Version of OptiStruct?

I am working on a nonlinear analysis with large displacements at the moment and am running into convergence issues and thought setting PARAM, EXPERTNL to YES might do the trick. I had a look in the online help of the 2019 Version but it only states that this parameter "activates nonlinear expert system to aid in the convergence of small displacement nonlinear problems.

Can somebody help me with this question?


Kind regards,



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