Numerical Simulation Of Stress Distribution Of Mound Breakwater Armor Blocks Under Wave Action

The rubble mound breakwater is the protective structure widely used in port and offshore engineering, and the research about strength failure of armor blocks is of great significance to prevent fracture failure of armor blocks in the extreme sea conditions. But in the physical model experiments, due to the impact of the scale effect, making the experimental results of the physical model can not truly reflect the strength of the structure of the armor blocks. Therefore carry out the numerical simulation of the sloping breakwater armor blocks strength failure under wave action is very important academic significance and value in engineeringIn this paper, a two-dimensional fluid-solid coupling numerical model, based on combined finite-discrete element method (FEM/DEM) and smooth particle hydrodynamic (SPH), is developed. This model simulate the stress distribute of mound breakwater armor blocks under wave action. The hydrodynamic conditions of the blocks are treated using the SPH method, the solid boundaries are simulated using virtual particles, this meet the boundary condition that fluid particles can not penetrate the solid boundary, and at the same time it also meet the boundary conditions of the contact force of the solid boundary. motions and deformation of blocks are simulated using the FEM/DEM model. The interaction forces between different blocks are calculated by penalty function method. The deformation of finite element is solved by central difference method.The computer graphics technology and unstructured mesh technology are introduced to build the two-dimensional fluid-solid coupling numerical rubble mound breakwater model. That not only ensure the divided grid density is uniform and have a strong adaptability on the boundary of a variety of shapes, but also ensure the surface of the block of virtual particles evenly distributed in irregular cross-section boundary. The accuracy of the method is confirmed by comparing the stress of rectangular concrete under hydrostatic pressure with the result of ANSYS under the same conditions. Based on the numerical model, the impact pressure and stress of armor blocks under wave action are provided, the stress duration curve of different points on armor blocks are analyzed.