Optistruct solver stuck at progress 13% for hours

Pradhyuman Shekhawat
Pradhyuman Shekhawat Altair Community Member
edited January 2023 in Community Q&A

Hello everyone, 

 

I am performing a transient dynamics analysis on a rocket structure. There are no errors when I run the analysis but the analysis stays at 11 - 13 % every time I run it. 

If you know, could you tell me the possible reasons for that?

 

I am attaching a screenshot with this query.image

It stays like this for hours.

 

Thanks

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Answers

  • Adriano_Koga
    Adriano_Koga
    Altair Employee
    edited January 2023

    how did you steup your TSTEP card? and what are the results that you're requesting?

    What is your model size? (# of elements and nodes)

    Can you share your .out file?

     

    Transient analysis is very time consuming, indeed. Specially if you're requesting a small timestep, and also requesting too many responses.

    Another thing, Direct transient analysis is the most expensive one, in general.

     

    Have you tried Modal Transient? It might speed-up a little bit your analysis, in most of the cases.

  • Pradhyuman Shekhawat
    Pradhyuman Shekhawat Altair Community Member
    edited January 2023

    I have attached images of tstep, and load step inputs.

    image.imageimage

    image

    I'm interested in displacement and stress results.

    Thank you for the advice. I'll try Modal transient analysis.

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