A SIMPLIFIED MODELING OF WAVE-DISSIPATING BLOCKS FOR PARTICLE-BASED SIMULATION OF WAVE OVERTOPPING

Abstract

 For modeling of wave-dissipating blocks in simulations of wave overtopping, the so-called porous model has been widely used. The conventional model evaluates the fluid resistance by using semi-empirical experimental constants uniformly over the entire permeable area, and thus local flow velocities inside the block are not considered, resulting in poor reproducibility, especially under wave breaking where complex flows inside the block become more significant. In this study, a new permeable layer model is developed to reproduce the complexity of the local flows between wave-dissipating blocks. It explicitly describes the existence of the shielding area and void channel by distributing a modeled block composed of fixed particles, and simulations are performed by incorporating the model into the particle method, which is superior in reproducing breaking waves. Wave overtopping simultaion on wave-dissipating blocks is conducted to show the reproducibility of the overtopping flow volume, and further, the wide applicability of the model is shown through the simulation of the seepage process through the space between crushed rocks.