Error message Optistruct

Altair Forum User
Altair Forum User
Altair Employee
edited October 2020 in Community Q&A

Hello

Following error message appears by running Optistruct:

 *** ERROR #  15 ***
 CTETRA element 3918 is distorted (zero or negative Jacobian).

 

Do you know how to solve the problem? 

 

Thank you in advance for your help.

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Answers

  • tinh
    tinh Altair Community Member
    edited December 2017

    Hi

    In hm enter panel F10>3D 

    Check 'tet collapse' 0.05 then fix the failed tetra

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited December 2017

    Thank you it worked now.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited February 2018

    Hello, 

    I have the same message but for Quad elements :

    A fatal error has been detected during input processing:

      *** ERROR #   15 ***
      CQUAD4 element    1429962 is distorted (zero or negative Jacobian).

     

    I tried a lot of things but i don't know how to resolve the problem.

     

    Thank you for your help :)/emoticons/default_smile.png' srcset='/emoticons/smile@2x.png 2x' title=':)' width='20' />

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited February 2018

    HI, @Thibaut  delete the element with ID 1429962 and a couple of adjacent element and recreate that patch of elements or Remesh that particular patch without deleting element and check if this helps.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited February 2018

    Thank you for your answer, I succeeded to remesh one element which had an error but there is a last one that I'm unable to remesh or delete because it create more errors and the calculation can't be fulfilled :

    <?xml version="1.0" encoding="UTF-8"?>image.thumb.png.c155498c02915889f34b0f27aa9e4471.png

    How can I resolve this problem ?

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited February 2018

    I've just seen I have too many quality errors as well (in the 'aspect ratio'). I don't know if this is possible to correct all this errors easily. :/

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited February 2018

    HI,

     

    Is it possible to share the model file, please?

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited February 2018

    Hi,

     

    No sorry it's confidential, I think I'll ask help of Hypermesh professional in my company.

    Thanks a lot for your help. :)/emoticons/default_smile.png' srcset='/emoticons/smile@2x.png 2x' title=':)' width='20' />

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited February 2019

    OptiStructtinh @GuestHi ! I have the same problem. And I check the  'tet collapse'. But I don't konw how to fix the failed tetra , can you hele me? 

     

  • tinh
    tinh Altair Community Member
    edited February 2019

    Hi

    Do you try tetra remesh subpanel?

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