Estimation of hydraulic anisotropy of unconsolidated granular packs using finite element methods

Lateef Akanji, Ghasem G. Nasr, Stephan K. Matthai

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The effect of particle shape and heterogeneity on hydraulic anisotropy of unconsolidated granular packs is hereby investigated. Direct simulation was carried out on synthetically generated spherical, aspherical, ellipsoidal (aspect ratio of 2 and 3) and lenticular samples. Single phase Stokes equation was solved on models discretised on finite element geometries and hydraulic permeability computed in the horizontal and vertical directions to estimate the degree of anisotropy.

The spherical and aspherical packs with varying degrees of particle shapes and heterogeneities are virtually isotropic. Ellipses with aspect ratios 2 and 3 have higher anisotropy ratios compared to the spherical and aspherical geometries while the lenticular geometry is the most anisotropic. This is attributable to the preferential alignment of the grains in the horizontal flow direction during random dynamic settling under gravity.
Original languageEnglish
Pages (from-to)153-166
Number of pages14
JournalThe International Journal of Multiphysics
Volume7
Issue number2
DOIs
Publication statusPublished - Jun 2013

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