How to fix 2D boundary shell intersection?

Hui Liu
Hui Liu New Altair Community Member
edited August 2022 in Community Q&A

Dear guys, I tried to fix the boundary shell intersection shown as follows using the "check 2D mesh" in the tetra mesh subpanel, but it doesn't work. 

image

Could you tell me how to use this function correctly? Thank you. There is an ancient similar question,https://community.altair.com/community?id=community_question&sys_id=2e66403a1b2bd0908017dc61ec4bcb4b. However, I didn't find any useful information. The above mesh is enclosed. 

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Answers

  • Robinson Ferrari_20451
    Robinson Ferrari_20451
    Altair Employee
    edited August 2022

    Hi Hui Liu,

    Please share your model and I can take a look. It looks like you have a bad CQUAD connected to two CTRIA elements.

    Take a look at the .pdf file from the online documentation that I'm attaching as a reference. I guess "Check 2D mesh" will not help you correctly here. Use 2D/Replace instead. Let me know if it works for you by accepting the answer as correct to inform others.

    Thank you very much,

     

  • Hui Liu
    Hui Liu New Altair Community Member
    edited August 2022
    Robinson Ferrari_20451 said:

    Hi Hui Liu,

    Please share your model and I can take a look. It looks like you have a bad CQUAD connected to two CTRIA elements.

    Take a look at the .pdf file from the online documentation that I'm attaching as a reference. I guess "Check 2D mesh" will not help you correctly here. Use 2D/Replace instead. Let me know if it works for you by accepting the answer as correct to inform others.

    Thank you very much,

     

    Dear Robinson,

    I read the attachment carefully, but it didn't help. The model shown above is created specifically for "check 2D mesh" function, which has been attached. It's a very simple cubic model and one tria element was manually splited in order to creat a intersection. Although "check 2D mesh" could find the intersection, it couldn't fix it automatically. So I am curious about how to use this function correctly since my real model is more complicated.

    Thanks a lot.

     

  • PaulAltair
    PaulAltair
    Altair Employee
    edited August 2022

    Hi, I took a look at your model, As Robinson guessed, it isn't a candidate for the 2d mesh check tool (yet) as it isn't an enclosed volume due to the discontinuity you have added to it, you should fix this first using normal mesh check tool ('edges' in tool menu will find these) then repair them with standard node replace/equivalence tools (manual or auto with threshold). NB. the 'equivalence' in the edge tool wont work here as you have a real discontinuity not just a pair of unequivalenced but coincident edges.

    The 'check 2d mesh' utility is to check for intersections and other potential quality problems in an enclosed mesh

    image

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