dof axis system

Rahul_P1
Rahul_P1
Altair Employee
edited October 2020 in Community Q&A

Hello I’m a Newbie with Hypermesh and starts my first simulations with some problems…

I try to apply a symmetry condition to a set of different faces their normals does not match the global axis.

I try this way without success:
1. Define the symmetry constraint in global axis system (analysis->constraints…)
2. Create a custom system (analysis->system->create by axis direction)
3. Assign the face-nodes with the custom system (analysis->system->assign. Set reference AND/OR set displacement)

Please help me…

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Answers

  • Rahul_P1
    Rahul_P1
    Altair Employee
    edited May 2015

    User_1

    Do you need to apply symmetric boundary conditions on your model? i.e. the model has been reduced because it is symmetric and you need to apply constraints in such a way as to reflect the original model?

    You seem to be following a method to apply constraints in a local coordinate system (constraining degrees of freedom that are at a diffferent direction than the global system), Is that what you need to do?
    go to analysis--> system-->create a coordinate system (local CS)
    now, go to assign in the same panel, select the nodes and assign the nodes to the local CS (make sure you click both set reference and set displacement) then the constraints created will be applied according to that co-ordinate system.

    Element normals are not related to constraints directly and to review or change the direction of element normals you need to go to tool > normals where you can first display the normals and then adjust them.

  • Rahul_P1
    Rahul_P1
    Altair Employee
    edited May 2015

    This is what i'm looking for...

    The solution works.

    Thanks

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