Numerical Analysis on Separated Flow Around a 2-D Sharp-Edged Body in Waves

Abstract

Taking into consideration of the damping characteristics of wake vortex, a numerical simulation method for separated flow around a large horizontal cylinder with sharp edges in waves was newly developed based on the combined diffraction theory and discrete vortex model. A damping vortex model was proposed semi-empirically and used in order to simulate the steady-state vortex flow pattern around the body in waves, which is observed in the real flow. Vortex patterns around a vertical thin-walled barrier, i.e. a curtain-walled breakwater, in waves were examined experimentally and compared with the numerical simulation results to check the validity of the analytical model. It was confirmed that the proposed numerical simulation method is very useful for obtaining the steady-state vortex flow patterns around the curtain-walled breakwater in waves. Based on the calculated results on the vortex flow, it was seen that the wave energy loss caused by the curtain-walled breakwater increases with increasing the wave period because larger vortices are formed around it.