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We have recently developed a conservative finite volume particle method (FVPM) that can efficiently model 2-D and 3-D fluid flow with free-surfaces and complex geometries. Tn this paper we present an extension of the method to fluid-structure interaction. A new boundary condition enforcement is presented in which the hydrodynamic forces required in solid equations are computed directly. For validation, we study the 2-D motion of fluid through an elastic gate and compare the displacement of the gate with experimental and numerical data. We observe a very good agreement between FVPM and other numerical and experimental data.