UNIFIED NUMERICAL ANAYSIS BETWEEN THE EXTENDED DARCY'S LAW AND NAVIER-STOKES EQUATION BY USING STABILIZED ISPH METHOD

Abstract

In 2011, Tohoku-Kanto earthquake tsunami caused serious damage on the port structures such as breakwater and seawall. Dam age mechanisms of these structures have been studied in the past, and there are mainly three causes; I. horizontal force due to the water level difference between the front and rear breakwater, II. soil scour and erosion behind the seawall during overflow and III. piping destruction associated with the decline of the bearing capacity by seepage flow. Fluid-Structure-Soil coupling simulation is desired for a systematic comprehension of seawall collapse mechanism, and it may help to develop next disaster prevention method. In this study, a particle simulation tool based on the SPH has been developed to solve seepage failure problem. This simulation should treat the surface flow and seepage flow interactions, and the particle simulation tool has been modified and improved to solve this interaction problem. In this study, as a first step, surface flow and seepage flow are described by the same government equation, and a SPH formulation has been developed. After that , efficiency and adequacy of the proposed simulation technique has been validated through an application to one test. This numerical result shows a reasonable surface flow and seepage flow behavior. In the future works, quantitative comparison with experimental results is required, and this tool may be developed to a Fluid-Structure-Soil coupling simulator.