Periodic Boundary Conditions (RVE)

Keonkim1991
Keonkim1991 Altair Community Member
edited October 2020 in Community Q&A

Is there any example of periodic boundary condition for a cubic (Unit Cell)?

As an example, bottom plane is fixed whereas top plane is -1% displacement, and result stress contours can be predicted for mesh or macro structures.

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited September 2018

    Hi,

     

    I couldn't find an example specific to unit cell.

     

    Here is an example on how to use periodic boundary conditions using OptiStruct: OS-E: 0705 Periodic Boundary Conditions

  • Keonkim1991
    Keonkim1991 Altair Community Member
    edited September 2018

    Hi Prakash, did you mean to attach a link or pdf file? I'm not sure where I can find the periodic boundary conditions examples in Optistruct. Please help.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited September 2018

    @Keonkim1991

     

    Sorry,

     

    Here is the PDF. This is an example. Please let me know if you need the files.

    Unable to find an attachment - read this blog

  • Keonkim1991
    Keonkim1991 Altair Community Member
    edited September 2018

    Hi Prakash, please share the example files with me. It's a bit hard to follow the document itself.

  • Enrico_20294
    Enrico_20294 Altair Community Member
    edited December 2018

    Hi Prakash, could you please share the .fem files, I cannot find them in the install directory.

    Thank you very much,

    Enrico

  • Pranav Hari
    Pranav Hari Altair Community Member
    edited December 2018

    Hi 

     

    Please find the files attached

     

     

    Unable to find an attachment - read this blog

  • Enrico_20294
    Enrico_20294 Altair Community Member
    edited December 2018

    Thank you very much.

    Could I ask for some suggestions?

    I'm modeling one unit cell of an infinite tassellation (such as lattice structures); the objective is to find the stiffness of the cell, simulating different loadcases.

    So, I need to use PBC on the single unit. In your opinion, what type of perbc best fits my case? I was thinking about mirror.

    Thanks,

    Enrico

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