ALE or Arbitrary Lagrangian Eulerian formulation is used to model the interaction between fluids and solids; in particular,
the fluid loading on structures. It can also be used to model fluid-like behavior, as seen in plastic deformation of materials.

Smooth Particle Hydrodynamics (SPH) is a meshless numerical method based on interpolation theory. It allows any function
to be expressed in terms of its values at a set of disordered point's so-called particles.

ALE or Arbitrary Lagrangian Eulerian formulation is used to model the interaction between fluids and solids; in particular,
the fluid loading on structures. It can also be used to model fluid-like behavior, as seen in plastic deformation of materials.

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

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)