Experimental Study And Numerical Simulation Of Hydrodynamic Characteristics On Arc Crown Wall

Compared with the solid conventional structure, the arc crown wall, which can reduce significantly overtopping, the crest level of the breakwater and enhancing the landscape of the embankment, is concerned widely in the port and coastal engineering in recent years. Research and engineering practices show that the wave feature in front of the breakwater is very complex and it has large deformations or has broken due to the influence of deformation of wave in shallow water and the reflection of the arc crown wall when the wave reaches the breakwater. In the present study, the hydrodynamic characteristic on the arc crown wall is still rare. So the research on the interactions between waves and the arc crown wall is important and has practical significance.This paper presents the experimental investigation of the different arc crown walls, and also the contrastive analysis by the numerical simulation results.The experimental investigation of the different arc crown walls is developed in regular wave. The wave pressures on the arc crown walls of vertical and sloping breakwater are systematically analyzed. The distribution characteristics are given for the wave pressures along the surface of the arc crown walls of vertical and sloping breakwater. The relations between wave pressures and the wave height H, the wave period T are presented. The distribution features of wave pressures on the different arc crown walls of sloping breakwater are compared. The effect of the parameters such as the relative height Hid, the relative wave length L/d, the shape of the arc crown wall on the wave force and wave moment on the arc crown walls of vertical and sloping breakwater are analyzed. The impact of the slope on the wave force and wave moment on the arc crown wall of the sloping breakwater is discussed.The BFC-VOF method for solving the problems of viscous flows with nonlinear free surfaces and the structure with complicated boundary shape is proposed. In the BFC system, the governing equations contain continuity equation and Reynolds equations. Two equations κ—ε model is used to close the equations. The transformed SIMPLE algorithm in the BFC system based staggered grid is proposed to correct the pressure-velocity field. The transformed VOF method is used to trace the free surface in BFC system. The numerical model based on BFC-VOF method is established to solve the wave force on the arc crown wall. The BFC model is verified by the experimental results. Meanwhile, the numerical analysis on the characteristics of flow fields near the arc crown wall is carried out by the BFC model. The effect of the arc radius on the wave force and wave moment on the arc crown wall is discussed.