Questionable connectivities

Jacobier_20601
Jacobier_20601 Altair Community Member
edited July 2023 in Community Q&A

Hi

I used the check element function to check some 2D elements.  It showed that they have "questionable connectivity"(See the attachment). How may I fix it? In fact, I did not see any visible problem with the elements.

 

Thank you.

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Answers

  • Jacobier_20601
    Jacobier_20601 Altair Community Member
    edited July 2023

    I did solve the problem myself. I found that there are some invisible elements sitting between those visible elements. After deleted the invisible elements, the check runs through.  I wonder whether this is a bug for element as slim as a line.  No matter how much I zoom in, nothing is shown on the graphic screen.

  • PaulAltair
    PaulAltair
    Altair Employee
    edited July 2023
    Jacobier_20601 said:

    I did solve the problem myself. I found that there are some invisible elements sitting between those visible elements. After deleted the invisible elements, the check runs through.  I wonder whether this is a bug for element as slim as a line.  No matter how much I zoom in, nothing is shown on the graphic screen.

    I can see them if I find by element length: e.g. for 1003898 below, I'm not sure how these were created in the first place?, they are quads but degenerated to a line as they only have 2 nodes repeated

    image

  • Jacobier_20601
    Jacobier_20601 Altair Community Member
    edited July 2023
    Paul Sharp_21301 said:

    I can see them if I find by element length: e.g. for 1003898 below, I'm not sure how these were created in the first place?, they are quads but degenerated to a line as they only have 2 nodes repeated

    image

    Thank you.

     

    I tried to export the model to COSMSOL and it immediately reported the error. When I read the export file, I successfully traced down those elements by ID. This is just a small section of my model. I wonder how I shall hunt all of them in a model with half a million of elements. 

     

    I hope HM could include function to check degenerated elements. 

  • Jacobier_20601
    Jacobier_20601 Altair Community Member
    edited July 2023
    Paul Sharp_21301 said:

    I can see them if I find by element length: e.g. for 1003898 below, I'm not sure how these were created in the first place?, they are quads but degenerated to a line as they only have 2 nodes repeated

    image

    These could be generated with equivalence the edges if HM has bug.

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