Abstract
Authors proposed 2D numerical method in time domain, using vortex method that can consider the fluid viscosity and calculated primary conversion efficiency of a floating OWCtype wave energy converter in waves. In this method, two models, that is, vorticity layer model and vorticity shedding model, for vorticity creation from the body surface and diffusion of the vorticity into the fluid region are used. In this paper, by comparing the calculation results with experimental results on the flow field around the circular cylinder in uniform flow and the vertical force acting on the oscillating submerged horizontal plate in vertical direction under still water surface, calculation accuracy of two vorticity creation models from the body surface is showed.