Tetra Mesh Self-Intersection

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

Hi,

 

I imported a deformed mesh into HM from ABAQUS and would like to remesh it according to certain element quality criteria. However, due to element distortions caused by previous FE analysis, the HM remesh function sometimes returns 'Self-intersection of the tetra mesh' and refused to remesh.

 

Is there any existing function in HM that can automatically remove these self-intersections?

 

Many thanks,

Wensong 

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited October 2014

    Hi Wensong,

    I usually do this but with 2D mesh.

    Please try with Tool -> Penetration -> Components and Include self interference -> Check -> Automatic fix.

     

    Best,

    Huynh

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited October 2014
    Altair Forum User said:

    Hi Wensong,

    I usually do this but with 2D mesh.

    Please try with Tool -> Penetration -> Components and Include self interference -> Check -> Automatic fix.

     

    Best,

    Huynh

    Hi Huynh,

     

    Thanks for the reply. I tried this but it shows zero intersection and penetration which is weird. Have you met this problem before?

     

    Many thanks,

    Wensong

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited October 2014

    Hi Wensong, 

     

    have you tried with 3D intersections and penetrations?

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited October 2014
    Altair Forum User said:

    Hi Wensong, 

     

    have you tried with 3D intersections and penetrations?

     

    Hi Prakash,

     

    Yes, I am pretty sure I have. Please have a look at the following two screenshots.

     

    The first one is the return I got from HM when trying to remesh

    https://drive.google.com/file/d/0B8pqXnKPKIghM3VLN3RfTHRlSEU/view?usp=sharing

     

    This second one is the results I got from penetration and intersection check

    https://drive.google.com/file/d/0B8pqXnKPKIghZjJQeGNrZnNlc1k/view?usp=sharing

     

    Please let me know if you have problem seeing these pictures.

     

    Many thanks,

    Wensong

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited October 2014

    Is it possible for you to share the model?

     

    you can use the dropbox link in my signature to share the model.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited October 2014
    Altair Forum User said:

    Is it possible for you to share the model?

     

    you can use the dropbox link in my signature to share the model.

     

    Hi Prakash,

     

    The model has been sent to your dropbox. Please let me know if you have problem opening it.

     

    I look forward to hearing back from you soon.

     

    Many thanks,

    Wensong

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited October 2014

    Hi Wensong,

     

    I have the model with me and looking into the issue.

     

    Do you have any element quality criteria? 

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited October 2014
    Altair Forum User said:

    Hi Wensong,

     

    I have the model with me and looking into the issue.

     

    Do you have any element quality criteria? 

     

    Hi Prakash,

     

    Yes, I do. Please see the picture attached.

    https://drive.google.com/file/d/0B8pqXnKPKIghOWxFa1BZaTZoUzg/view?usp=sharing

     

    However, these criteria are not compulsory. They are there to ensure there is no element self-intersection after a displacement FE analysis. Obviously with the better element quality, a larger displacement can be applied - hence allowing the analysis to be more efficient.

     

    It would be extremely helpful if you can let me know how to fix these 'self-intersection' problems since ideally I would like to automate the process through command files.

     

    Thank you so much for your help.

     

    Regards,

    Wensong

     

    P.S. Speaking of element quality criteria, do you by any chance know why the 'Min Size' and 'Max Size' options can not be selected in the 'Edit Criteria' panel? Cheers

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