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Ansys Learning Forum › Forums › Discuss Simulation › LS Dyna › Fluid-structure interaction coupling › Reply To: Fluid-structure interaction coupling

November 19, 2024 at 1:53 am
Ian Do
Ansys Employee

Hi Mamun,

If your ALE mesh is fine enough to resolve the motion of the LAG structure, and if you represent the trapped air properly and distinguish it from the air outside, then as your structure moves, the ALE elements will be updated to contain the proper volume fraction of whatever AMMG (ALE multi-material groups) that you have defined in the domain accordingly. This means that if the LAG structure moves 20 cm , say in the x dir, you will need enough ALE elements to span that 20 cm so that the AMMG displacements can be calculated and the effects reported. How many elements? That is up to your engineering judgment.

Ian

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