Multiscale modeling of wave propagation in saturated granular material
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We present a multiscale approach featured by coupling two-phase material point method (MPM) with discrete element method (DEM) (MPM-DEM) to simulate the wave propagation of saturated porous media. The multiscale approach solves the solid-fluid interactions of saturated porous media in the macroscopic domain by the MPM using the u-v-p formulation, while the path-dependent effective constitutive responses for each material point under complex loading conditions are reproduced by a DEM assembly comprised of arbitrarily shaped particles. A semi-implicit integration scheme based on the fractional step algorithm is further implemented in the proposed multiscale approach to improve its overall efficiency. The proposed approach is first validated by the one-dimensional consolidation test before being further used to simulate the wave propagation in saturated porous media with anisotropic microstructure. We further investigate the influence of the elliptic particle arrangement on the wave propagation pattern and properties.
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