LS Dyna

LS Dyna

Abnormal Result in Explicit Dynamic with same configuration

    • Nik0s
      Subscriber

      Dear Ansys forum stuff and members,

      I am conducting a pilot analysis of a Reinforced Concrete (RC) frame (Ansys 2021 R1 Workbench Explicit Dynamic - Autodyn) to investigate the numerical stability for future more complex designs. When I clear the mesh and generate it with the same configuration , I notice a numerical instability (different result). The problem occurs when importing 2 or more groups of line beams with Reinforcement body interaction.

    • Ram Gopisetti
      Ansys Employee
      what are numerical instabilities your are quoting in the about graphs? , it seams the changes are minute.
      cheers, Ram

    • Nik0s
      Subscriber
      Hello @ram_gopisetti I understand that the differences are small, but when one system produces a deterministic result and the other a stochastic one, it raises questions about the solution process. So, let's simplify my original expression to reach a conclusion that will be interesting.
      First, I would like to know if when you only do clear data for the mesh and then generate without changing anything else in the system the result should be deterministic or stochastic and why?
      And secondly when you have beam elements inside a solid and some of them you want to behave like an entity after the solid is broken (based on damage rule) which is the more correct choice for the share topology, share or marge (in SpaceClaim)?
      Thank you for your time.

    • Nik0s
      Subscriber

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