A coupled numerical model is presented for the simulation of wave transformation in porous structures. The model is developed combining porous flow model and two-phase flow model. The porous flow model is based on the spatially averaged Navier-Stokes equations. In two-phase flow model, air zone of finite thickness above the water surface is incorporated and a unique solution domain is established with the special treatment of interface boundary between water and air. Free surface advection is modeled by the volume of fluid method with newly developed fluid advection algorithm. The parameters representing the resistance to flow in porous medium due to the presence of solid skeleton are calibrated for different wave conditions. The model is then applied to simulate wave attack on porous structure for several wave and structural conditions. There exist optimum structure width and porosity that can maximize the hydraulic performances.
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