Abstract
In a wave or flow simulation including a porous media, a drag force is given to a fluid inside a porous media to simulate flow resistance due to a porous body. However, in a case that a water surface exists inside a porous media such as a wave absorbing block area, a volume conservation cannot be satisfied without taking a porosity of a porous media into consideration. An apparent volume change of a fluid particle on the basis of the porosity is one way to solve this problem in a particle method. In this study, a wave analysis on a wave absorbing seawall is carried out using an improved multi-resolution MPS method. In this simulation, it is shown that an apparent volume change works very well to estimate a wave overtopping discharge more accurately and the calculated result for the case with volume change is in much better agreement with an experimental result than the one without volume change. Besides, it is found that the introduction of a turbulence model can be effective for a more accurate estimation of a wave overtopping discharge.
