Questions about element check and tetra mesh optimization

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

Dear all,

 

When the mesh quality is insufficient, OptiStruct exits with errors. Violated criteria are given in the .out file. Some criteria do not match to those in hypermeh Tool/ check elems or those in tetra mesh optimization.

 

E.g.

 ------------------------------------------------------------------------------
 Element     Property          # of     Recommended Range    Max.  Viol.  Elem.
                               Viol.     Lower     Upper    Value  type    No.
 ------- ------------------- -------- --------- --------- --------- --- -------
 TET10   Edge Angle               297        --     75.00     85.47  U  7028914
 TET10   Face Vertex Angle        867     15.00    165.00      8.44  L  7030125
 

 

 

OptiStruct uses 'Edge Angle' for TET10. What is the corresponding criterion in HyperMesh / Tool / check elems or tetra mesh optimization?

 

I get element quality errors in OptiStruct also due to 'Face Vertex Angle' (TET10). What is the corresponding criterion in tetra mesh optimization so that I can improve those angles?

 

Kind regards

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Answers

  • tinh
    tinh Altair Community Member
    edited April 2015
    Altair Forum User said:

    Dear all,

     

    When the mesh quality is insufficient, OptiStruct exits with errors. Violated criteria are given in the .out file. Some criteria do not match to those in hypermeh Tool/ check elems or those in tetra mesh optimization.

     

    E.g.

     ------------------------------------------------------------------------------

     Element     Property          # of     Recommended Range    Max.  Viol.  Elem.

                                   Viol.     Lower     Upper    Value  type    No.

     ------- ------------------- -------- --------- --------- --------- --- -------

     TET10   Edge Angle               297        --     75.00     85.47  U  7028914

     TET10   Face Vertex Angle        867     15.00    165.00      8.44  L  7030125

     

     

     

    OptiStruct uses 'Edge Angle' for TET10. What is the corresponding criterion in HyperMesh / Tool / check elems or tetra mesh optimization?

     

    I get element quality errors in OptiStruct also due to 'Face Vertex Angle' (TET10). What is the corresponding criterion in tetra mesh optimization so that I can improve those angles?

     

    Kind regards

     

    Hi,

    Are you performing shape optimization?

    hypermesh check face vertex angle but some solvers concern about face-edge-face angle

    also with tetra model you should verify tet collapse. so thin tetras make poor quality of model

    for other types of angle you need a script or a template to check by hypermesh

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