Convergence NLSTAT

Rahul_P1
Rahul_P1
Altair Employee
edited October 2020 in Community Q&A

Hi,

I'm performing a nonlinear static analysis (NLSTAT) on a FEM model.

I had some doubts about options on the card NLPARM.

The options for convergence are set on UPW. I was wondering, for this type of analysis can set them on P?

What is the difference?

Best Regard,

Alessio
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Answers

  • Rahul_P1
    Rahul_P1
    Altair Employee
    edited February 2015

    HI Alessio,

    UPW are the convergence criteria's for a nonlinear problem.

    U stands for displacement based convergence criterion, P stands for load based convergence criterion and W stands for work /strain energy based convergence criterion.

    Tight convergence is recommended for accurate results and hence UPW is default..one could have loose convergence by choosing combination of criteria's but may end up compromising with result accuracy

  • narasimhamurthy
    narasimhamurthy Altair Community Member
    edited June 2015

    Hi,

     

    how can we decide value of NINC,KSTEP,MAXITER,EPSU,EPSP,EPSW in NLPARM and TTERM in load step.

     

     

     

    thank you

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