# Ale Fsi Projection

Ale Fsi Projection entities provide a coupling method for simulating the interaction between a Lagrangian material set (structure) and ALE material set (fluid).

The nearest ALE nodes are projected onto the Lagrangian structure surface at each time step. This method does not conserve energy, as mass and momentum are transferred via constrained based approach.

## LS-DYNA Cards

Card Description
*ALE_FSI_PROJECTION Provides a coupling between Lagrangian material set (structure) and ALE material set (fluid).