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Shimohata, Kazuki*; Aoki, Takayuki*; Sitompul, Y.; Watanabe, Seiya*
no journal, ,
Debris flow is one of severe disasters for human lives and the damages are increased when large rocks are included. In this study, we carry out a debris free-surface flow simulation coupled with the rock motion. The cumulant Lattice Boltzmann Method is employed for the fluid dynamics and the Discrete Element Method is used to describe the collisions between rocks and between rocks and dykes. A non-Newtonian Bingham model is applied to the debris flow. A debris flow including 1,000 rocks is accelerated on the slope and most large rocks are trapped by the dyke.
Shimohata, Kazuki*; Aoki, Takayuki*; Sitompul, Y.; Watanabe, Seiya*; Dawei, S.*
no journal, ,
The debris flow is very harmful to the safety of human lives and properties when it accompanies floating objects such as rocks, damage is multiplied. In this study, computational fluid dynamics (CFD) based simulations for the motion and mechanical properties of rock are carried out. The cumulant lattice Boltzmann method (LBM) and discrete element method (DEM) are utilized to simulate fluid phase and solid phase respectively. Non-Newtonian fluid is applied to the fluid phase. For the interface capturing method, a conservative Allen-Cahn equation is employed to maintain the mass conservation. In order to increase the computational efficiency, CUDA programming and adaptive mesh refinement (AMR) method are applied.