Multiscale Modeling of Soil-Fluid-Structure Interaction

U. El Shamy, Y. Abdelhamid
dem, Discrete element method, Fluid, Lattice Boltzmann Method, Multiscale, Particles, Simulation

We present early results of a fully coupled transient two-dimensional model employed to study fundamentals of flood-induced failure of geotechnical systems while taking into consideration the effect of soil-fluid-structure interaction. The interaction of the liquid and solid phases is the key mechanism related to flood-induced failures of geotechnical systems. The solid phase is idealized at a particle scale by using the discrete element method. The fluid phase is modeled at a mesoscale level and solved using the lattice Boltzmann method. The structure is modeled as a rigid wall that interacts with the particles and fluid. The proposed approach is used to model a sheet pile wall subjected to an increasing water pressure. The velocity of the particles and fluid are monitored during the simulation. The simulation provides the fluid velocity in the pores. The classical seepage total head contours are retrieved from the numerical simulation. As the hydraulic head difference increases, the upstream bed surface settles and the downstream bed surface heaves.

Keywords: DEM, Discrete Element Method, Simulation, Lattice Boltzmann method, Particles, Fluid, Multiscale

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