TYPE1 interface is used to model fluid-structure interactions, as shown in Figure 1.Figure 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:
The acceleration of the ALE node is computed by:
The grid velocity of the ALE node is equal to the material velocity of the Lagrange
node:
The normal material velocities of Lagrange and ALE nodes are equal.
Therefore: