This research investigates applicability of the two-phase flow MPS (Moving Particle Semi-implicit) method to performance analysis of the OWC (Oscillating Water Column) type WEC (Wave Energy Converter). Estimating detail behavior of an OWC type WEC under any sea state including heavy weather is important for evolution of development of OWC type WECs. Basic applicability and effectiveness of the present method is indicated by numerical simulation of reproducing a coastline OWC type WEC model against a large wave. In addition, arrangement of air particles for setting computational domain is examined. Numerical results about wave impact force analysis by the simulation that air particles are arranged small agree well with the results by the simulation that air particles are arranged full. The result indicates that the present method with pseudo air pressure can reduce computational costs. The full arrangement simulation indicates effectiveness to response analysis of OWC type WECs in the severe wave by the present results including numerical results of response in the chamber. In case of carrying out the small arrangement simulation, suitable boundary condition is required at the end of duct for improving calculation accuracy of response analysis in the air chamber.
