Abstract
At the heavy rain in Kyushu in northern Kyushu in July 2017, a large number of reservoirs were damaged, and they were destroyed. Even in the sea area, lakes and reservoirs, waves are generated by sediment inflow due to slope collapse. The wave may cause damage to surrounding structures and people. In this study, we use OpenFOAM to treat sediment as density flow. The validity of the model for the phenomenon due to the influx of earth and sand into the hydrostatic area was examined. We conducted experiments as accuracy verification and reproduced by numerical analysis. OpenFOAM needs reproducibility by tuning with the kinematic viscosity coefficient ν of sediment and density ρ, and the surface tension σ of interfaces related to sediment. From the analysis results, it was possible to grasp the flow velocity distribution around the sediment flow. We were able to grasp the formation process of nose and head at the tip of sediment flow.
