Research On The Hydrodynamic Performance Of Arc-Crown Wall Floating Breakwater

With the advancement of the marine power strategy and the gradual development of marine exploitation and engineering into deep-sea areas,traditional gravity-type breakwaters have problems such as high construction costs,difficulty in construction,and incompatibility with wave energy distribution.Floating breakwaters have almost no construction cost constraints based on water depth and seabed conditions and can fully utilize the characteristic of wave energy concentration on the water surface,they have broad application prospects in coastal and ocean engineering.However,the wave attenuation effect of the current floating breakwaters is still not ideal.Therefore,this article proposes a new type of arc-crown wall floating breakwater structure and conducts research on its hydrodynamic performance under different mooring forms.This article is based on the theory of fluid mechanics and computational fluid dynamics(CFD),using the Navier-Stokes equations as the governing equations,combined with the continuity equation and momentum equation to describe the movement of incompressible viscous fluids.The turbulent model is used to close the equation system,and the VOF method is used to capture the free surface of the fluid.The coupled motion equations of floating bodies and wave motion equations are realized by establishing an overlapping grid.The wave generation is achieved by using the velocity boundary method,and wave attenuation is achieved using a damping layer.A 2D numerical model of wave interaction with arc-crown wall floating breakwater is constructed using Star-CCM+ software.The numerical model is validated for wave generation and attenuation,grid independence,and accuracy of the tank length,ensuring the accuracy and rationality of the numerical model.The established numerical model is used to study the hydrodynamic performance of arc-crown wall floating breakwater under both pile-anchor and chain-anchor mooring systems.The effects of parameters such as relative height,relative wave height,relative draft,relative radius,and chain angle on the hydrodynamic performance of curved-wall floating breakwaters are discussed.The results obtained from numerical simulations indicate that the numerical model developed is capable of effectively replicating the interaction between waves and an arc-crown wall floating breakwater.Under pile-anchor mooring,reducing relative height and increasing relative wave height can effectively reduce the transmission coefficient,dissipation coefficient,and heave motion response.Under chain-anchor mooring,reducing relative height and increasing relative draft can effectively reduce the transmission coefficient.Overall,the wave attenuation capacity of the curved-wall floating breakwater under pile-anchor mooring is better than that under chain-anchor mooring.