Symmetry Constrains

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

Hi i need to work with symmetry model for simplify the model. I've imported the geometry already simmetric on one plane. What kind of constrains do i have to use for the simmetry? Are the morph constrains?

 

Thank you very much

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited December 2015

    Suppose the symmetrical plane is XY. You'll work with only a half. The following constrains should be applied to all node on symmetrical  plane :

    • Translation according to Z should be Zero
    • Rotation around X should be Zero
    • Rotation around Y should be Zero

     

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited December 2015

    Thank you very much!

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2017

    Hello I have a similar Problem.

    I have a platform with 3 legs and what to optimice only a 1/6th of the model (60 Deg).

    Is it in Hyperworks posible, in ANSYS there is Cyclic Symmetry.

    Thanks

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited April 2017

    Hey b.o.alpers,

     

    As to what I know it is not possible in Hyperworks. I asked for such an option a few months ago, as to do an axisymmetric analysis. The response was no, it does not exist. The minimum you can do is therefore the quarter.

     

    Regards,

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited April 2017

    Here is a tutorial which you can refer to AxiSymmetric structures. 

    <?xml version="1.0" encoding="UTF-8"?>OS-1070.PNG

  • tinh
    tinh Altair Community Member
    edited April 2017
    Altair Forum User said:

    Hey b.o.alpers,

     

    As to what I know it is not possible in Hyperworks. I asked for such an option a few months ago, as to do an axisymmetric analysis. The response was no, it does not exist. The minimum you can do is therefore the quarter.

     

    Regards,

     

    It is possible, you need y-constraint in cylindrical displacement system instead of ordinary rectangular one

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited April 2017

    Hi tinh,

    Thanks for your answer. How is that possible to define ? I precise that I personnaly work with Hypermesh/Radioss, and my problem of an axisymmetric simulation in implicit simulation was not solve.

     

    Thanks,

  • Merula_20758
    Merula_20758 Altair Community Member
    edited May 2017

    Is this like assigning the nodes of the surface to the cylindrical coordinate system?

    Because I found no option to assign a spc to a other coordinate system (other like forces, which can be assigned)

     

  • tinh
    tinh Altair Community Member
    edited May 2017

    Hi Merula

    SPC is calculated regarding to coord system indicated by CD field of GRID card

    assign CD by panel analysis>system>nodes>set displacement

  • Merula_20758
    Merula_20758 Altair Community Member
    edited June 2017

    Merci!

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