3D-Numerical Simulation of Wave Pressure Acting on Caisson and Wave Characteristics near Tip of Composite Breakwater

摘要

It has been widely known that the effect of diffracted waves at the tip of composite breakwater with finite length causes the change of standing wave height along the length of breakwater,the spatial change of wave pressure on caisson,and the occurrence of meandering damage on the different sliding distance in sequence.It is hard to deal with the spatial change of wave force on trunk of breakwater through the two-dimensional experiment and/or numerical analysis.In this study,two and three-dimensional numerical techniques with olaFlow model are used to approach the spatial change of wave force including the impulsive breaking wave pressure applied to trunk of breakwater,the effect of rear region,and the occurrence of diffracted waves at the tip of caisson located on the high crested rubble mound.In addition,it is thoroughly studied the mean wave height,mean horizontal velocity,and mean turbulent kinetic energy through the numerical analysis.In conclusion,it is confirmed that the larger wave pressure occurs at the front wall of caisson around the still water level than the original design conditions when it generates the shock-crushing wave pressure checked by not two-dimensional analysis,but three-dimensional analysis through the change of wave pressure applied to the caisson along the length of breakwater.