How can i choose the element size of 3d solid for a topology optimization

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

Hi,

 

Please i wonder always how can i choose the element size of a 3d body (60*80*400) for a topology optimization ? ho can i be sure for example that element size =4  is the perfect size of elements or no  ?

 

Thank you 

 

 

 

Tagged:

Answers

  • Q.Nguyen-Dai
    Q.Nguyen-Dai Altair Community Member
    edited May 2018

    The choice depends to:

    • Your goal of analysis, your precision
    • Your capacity of computing hardware
    • Your FEM experiences

     

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited May 2018

    For exemple i choose element size = 4 for this solid body 

    and i get the result in picture 2  ( with MINDIM=12) 

    now how can i say that this element size is suffisant or not ? how can i say it's the right one or not ?

     

    thank you 

    <?xml version="1.0" encoding="UTF-8"?>aaaaa.PNG

    <?xml version="1.0" encoding="UTF-8"?>za.PNG

  • Q.Nguyen-Dai
    Q.Nguyen-Dai Altair Community Member
    edited May 2018

    Maybe try with size=3,2,1 and compare all?

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited May 2018

    if i will whange the size i will reconnect all the fix bolt (beacause i will loose the ID of élements connected with RBE3 ELEMENTS ) 

    there is an solution to remesh only the inside of the solidbody without make any difference on the outsides elements connected with other body ?

     

    Than you

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited May 2018

    HI,

     

    There is no thumb rule for mesh size. You can do a mesh sensitivity analysis to get the right mesh size for your model and use the same for topology optimization. 

Categories