SPH-DEM連成解析による洗堀現象シミュレーションにおける乱流の影響

<p>The mechanisms of the seawall destruction have been studied and the following three causes have been investigated in general; 1) horizontal force due to the water level difference, 2) soil scour and erosion behind the seawall during overflow, 3) seepage failure associated with the reduction of the bearing capacity. Whereas, the collapse predictions by complex destruction factors have not ever been realized. Hence, to predict various destruction due to interaction between water and soil, a multiphase flow simulator utilizing the Incompressible Smoothed Particle Hydrodynamics method (ISPH method) for water and Discrete Element method (DEM) for soil is developed in our research group. In this research, scouring phenomena in particularly gravel compared between vertical jet flow experiment and simulation. The authors proposed modifying drag force model in the vicinity of ground focused on gravel movement affected by turbulent eddy. We confirmed necessity of modified drag force in turbulent through comparison between experiment and calculation.</p>