Numerical modeling of wave-porous structure interaction process with an SPH model

This paper presents a smoothed particle hydrodynamics (SPH) model for modeling the fluid-structure interaction of waves and porous structures with high permeability. In the proposed model, the solid and fluid phases are discretized with two types of SPH particles; thus, the model can be applied to study heterogeneous problems directly. We use a varying smoothing length model to preserve the numerical accuracy inside and outside the porous media. The SPH artificial numerical viscosity mode is used in this study to achieve stable numerical solutions. Furthermore, the well-known Forchheimer model has also been used to model the flow in porous media with high Reynolds numbers. With the current model, the experimental observation of the water-level evolutions of a wave-dam interaction benchmark problem has been reproduced. We have also investigated a scenario with a heterogeneous distribution of porosities and compared the simulation results to those of the benchmark problem. Consequently, our model can determine how porous structures can reduce the kinetic energy induced by the waves around the coast.