Direct numerical simulation of wave propagation in saturated random granular packings using coupled LBM-DEM

Poroelasticity theory predicts wave velocities in a saturated porous medium through coupling between the bulk deformation of solid skeleton and fluid flow. The challenge emerges below characteristic wavelengths at which hydrodynamic interactions grains pore become important. We investigate pressure volume fraction dependence compressional- shear-wave fluid-saturated, random, isotropic, frictional granular packings. lattice Boltzmann method (LBM) discrete element (DEM) are two-way coupled to capture particle-pore interactions; an acoustic source is implemented insert traveling from reservoir medium. extract branches wavenumber-frequency space, for range confining pressures fractions. For random isotropic media pressure-wave velocity data collapse on single curve when scaled properly by fraction.