The finite element software framework, OpenSees, has been used by researchers
to simulate the response of structural and geotechnical systems to earthquake loading. Implementation of the Particle Finite Element Method (PFEM) has made it possible to simulate hydrodynamic forces through fluid-structure interaction (FSI) in OpenSees. To validate the FSI implementation in OpenSees, wave flume experiments conducted at the Public Works Research Institute (PWRI) in Japan in 2011 are numerically simulated. Federal Emergency Management Agency (FEMA) design equations for hydrodynamic drag and uplift forces are also compared to the PFEM and PWRI results to assess the differences between experiments, PFEM simulations, and empirical equations used for design. The PFEM implementation in OpenSees does a good job replicating physical experiments and shows agreement with the FEMA equations. Real world FSI applicability coupled with the ability to generate a large scale multi-hazard simulation for coastal communities will make OpenSees a powerful tool for future research, design, assessment and community resilience applications.