Step Size Settings for Optistruct

seyilmaz
seyilmaz Altair Community Member
edited October 2020 in Community Q&A

Hello,

 

I have a non-linear quasi-static analysis. I want my model to start with 0.01 increment (finishes at 1 so the total number of steps will be 100) and continue  this way. I do not want Optistruct to automatically adjust increment.

 

I set NINC in NLPARM 100. 

 

How can I set step size to be constant throughout solution?

 

I know this is so basic. Thank you in advance.

 

Regards,

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Answers

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited November 2018

    Use PARAM,EXPERTNL,NO      

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2018
    Altair Forum User said:

    Hello,

     

    I have a non-linear quasi-static analysis. I want my model to start with 0.01 increment (finishes at 1 so the total number of steps will be 100) and continue  this way. I do not want Optistruct to automatically adjust increment.

     

    I set NINC in NLPARM 100. 

     

    How can I set step size to be constant throughout solution?

     

    I know this is so basic. Thank you in advance.

     

    Regards,

    Hi

     

    Do you mean time increment?

     

    Is it a small displacement analysis or large displacement analysis?

     

    If it is a large displacement analysis, please use NLADAPT and DIRECT to YES. This uses fixed time increment. In case of divergence, the run will stop immediately.

  • seyilmaz
    seyilmaz Altair Community Member
    edited November 2018

    Hello,

     

    Thnak you for your answers.

     

    I meant constant time increment. But it seems like both NLADAPT and EXPERTNL will do what I want. 

     

    Regards,

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