Particle Finite Element (PFEM). The PFEM is an innovative numerical method for solving a wide spectrum of problems involving the interaction of fluids and structures. The main range of applications lay in the field of free-surface problems, fluid-structure interaction, problems where large deformation of the physical domain is observed and multiphase problems. The most typical applications include areas as Naval Engineering, Mold Filling, Casting problems, Multiphase Flows, Civil and Coastal Engineering, amongst others.