Fluid structure interaction of composite propeller blades involving large deformations Composite propeller blades experience significant flow induced deformations so coupled simulations of fluid and structure are needed for design optimization and failure prognostics. A comprehensive modelling of the mixer propeller and tidal turbine blades are discussed within this research work. An extensive CFD FEM failure prognostic and bi directional FSI simulations of layered composite blade are performed. In the last section of the thesis a novel application of FSI simulation technique involving large deformations and anisotropic property of composite materials are presented briefly.<eng>