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Fluid-Structure Interaction (TYPE 1 Interface)

TYPE1 interface is used to model fluid-structure interactions, as shown in 図 1.


図 1. Fluid-Structure Interaction

This interface allows Lagrangian elements (structure) to interact with ALE (Arbitrary Lagrangian Eulerian) elements, which model a viscous fluid. Full slip conditions are applied at the boundary between the two domains.

The acceleration of the Lagrange node is computed by:(1)
γi=Fi+Fam+ima
The acceleration of the ALE node is computed by:(2)
γa=Fama
The grid velocity of the ALE node is equal to the material velocity of the Lagrange node:(3)
wa=vi
The normal material velocities of Lagrange and ALE nodes are equal. Therefore:(4)
van=vin