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LS Dyna

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How do I place a Lagrange structure into an ALE element?

    • Caleb Wood
      Subscriber

      I am modelling a FSI problem and am having an issue with placing the Lagrange structure (steel H piles in this case) into the Eulerian elements (water in this case). The issue is if I model the piles directly in to ALE mesh and assign a coupling contraint between the pile elements and the water elements, it creates an instability and sends the water flying in all directions, which is definitely a non-physical behaviour. Note that this does not occur at t = 0 sec, but rather after some time has elapsed (say 0.5 to 1 seconds). Does anyone know how to correct this issue? Thank you.

    • Ram Gopisetti
      Ansys Employee

      Hi,

      Leave the piles as Lagrange and use water to ALE then use Constrained Lagrange in solid card and check with DIREC parameter =3 control ILEAK 

      cheers, Ram 

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