SPH Modeling Of Wave Interaction With Partially Perforated Caissons

The perforated caissons are widely used to decrease wave forces and reflection effectively in costal engineering. Recently, the nonlinear interactions between waves and partially perforated caissons are mainly concentrated on experiments. Theoretical researches are only concentrated on some simple models, though there are a little research results calculated by traditional numerical simulations. Because it is hard to capture free water surface and deal with large deformation for traditional numerical simulations. Being a meshfree Lagrangian method. Smoothed Particle Hydrodynamics model does not require the explicit surface capturing scheme in treating strong nonlinear flows with large free surface deformation and enables the easy modeling of coastal structures with complex geometrical boundaries. SPH has attracted favorable attention in ocean and coastal engineering and been utilized to solve a variety of nonlinear problems.In present paper, an improved WCSPH model is developed to investigate the wave interaction with partially perforated breakwaters. The Corrective Smoothed Particle Method (CSPM) is used to renormalize the kernel function and the kernel gradient. The DBPs condition is used to treat the solid boundary. In order to compensate the effect of the truncated compact support on the estimation of the pressures, a correct procedure is proposed to evaluate the dynamic pressures on the body surface. The nonlinear interactions between the waves and the partially perforated breakwaters are investigated.The performance of the model is validated by the surface elevations in and out of the sponger layer and the analytical solution of the surface elevations and wave pressures in front of the vertical wall. The SPH results of the reflection coefficients of the perforated caissons are compared with the available experimental data and good agreements are obtained. The effects of the relative wave chamber width B/Lc, the porosity ? of the perforated wall and wave steepness Hi/Lc on the wave energy dissipation of the perforated caissons are discussed. The wave pressures on the perforated front wall and the rear wall are analyzed.