Nonlinear Irregular Waves-current Interaction on Flow Fields with Wave Breaking around Permeable Submerged Breakwater

摘要

In this study,the nonlinear interaction of irregular waves with wave breaking and currents around permeable submerged breakwater was investigated with the aid of olaFlow model which is open source CFD software published under the GPL license.The irregular wave performance of olaFlow applied in this study was verified by comparing and evaluating the target frequency spectrum and the generated frequency spectrum for applicability to irregular waves.Based on the applicability of this numerical model to irregular wave fields,in the coexistence fields of irregular waves and currents,the characteristics of wave height,frequency spectrum,breaking waves,averaged velocity and turbulent kinetic energy around porous submerged breakwater with the respect to the beach type and current direction versus wave propagation were carefully investigated.The numerical results revealed that the shape of wave breaking on the crown of the submerged breakwater and the formation of the mean flow velocity around the structure depend greatly on the current directions and the type of the beach.In addition,it was found that the wave height fluctuation due to the current direction with respect to the wave propagation is closely related to the turbulent kinetic energy.