Considering that the wave dissipation effect of marine protective structures under long-period wave conditions is not ideal,this paper proposes a breakwater structure of submerged embankments and arc plates.Based on the open-source fluid dynamics platform OpenFOAM,a numerical model of the interaction between waves and submerged breakwaters with curved plate breakwaters is established using the continuous equation and Reynolds averaged Stokes equation as the fluid control equations.Using a numerical model validated by experimental results,the influence of arc width and submergence depth on the wave dissipation performance of a submerged breakwater arc plate breakwater is analyzed,and the distribution characteristics of wave pressure on the upper and lower surfaces of the submerged breakwater arc plate breakwater arc plate are explored.The results show that within the wave period range set in this article,the transmission coefficient of the submerged breakwater and the arc plate breakwater decreases with the increase of submerged depth and arc plate width.Its reflection coefficient increases with increasing depth and plate width.The positive and negative wave pressures on the lower surfaces of the submerged breakwater and arc plate breakwater are approximately symmetrical about the horizontal axis,while there are significant differences in the positive and negative pressure values between different measurement points on the upper surface.The research results can provide certain theoretical and technical guidance for engineering applications.