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

Hongyang Cheng*, Stefan Luding, Jens Harting, Vanessa Magnanimo

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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Abstract

Poroelasticity theory predicts wave velocities in a saturated porous medium through a coupling between the bulk deformation of the solid skeleton and porous fluid flow. The challenge emerges below the characteristic wavelengths at which hydrodynamic interactions between grains and pore fluid become important. We investigate the pressure and volume fraction dependence of compressional- and shear-wave velocities in fluid-saturated, random, isotropic, frictional granular packings. The lattice Boltzmann method (LBM) and discrete element method (DEM) are two-way coupled to capture the particle-pore fluid interactions; an acoustic source is implemented to insert a traveling wave from the fluid reservoir to the saturated medium. We extract wave velocities from the acoustic branches in the wavenumber-frequency space, for a range of confining pressures and volume fractions. For random isotropic granular media the pressure-wave velocity data collapse on a single curve when scaled properly by the volume fraction.
Original languageEnglish
Title of host publicationPowders & Grains 2021 – 9th International Conference on Micromechanics on Granular Media
DOIs
Publication statusPublished - 7 Jun 2021
Event9th International Conference on Micromechanics on Granular Media, Powders and Grains 2021 - Virtual Conference, Argentina
Duration: 5 Jul 20216 Aug 2021
Conference number: 9
https://www.powdersandgrains.org/

Publication series

NameEPJ Web of Conferences
Volume249

Conference

Conference9th International Conference on Micromechanics on Granular Media, Powders and Grains 2021
Abbreviated titlePowders and Grains 2021
Country/TerritoryArgentina
CityVirtual Conference
Period5/07/216/08/21
Internet address

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