A Study of Pore Geometry Effects on Anisotropy in Hydraulic Permeability Using the Lattice-Boltzmann Method

Journal Article · Fri Sep 01 04:00:00 EDT 2006 · Advances in Water Resources, 29(9):1328-1340

DOI:https://doi.org/10.1016/j.advwatres.2005.10.012· OSTI ID:891419

Stewart, Mark L; Ward, Andy L; Rector, David R

We hypothesize that anisotropy in soil properties arises from pore-scale heterogeneity caused by the alignment of aspherical soil particles. We developed a method to predict the permeability tensor from particle shape and packing structure. Digital geometry maps were created for the pore space in regular cubic and random packs of particles with various aspect ratios using a numerical packing algorithm. The lattice-Boltzmann method was used to simulate saturated flow through these packs, and the effect of particle shape and degree of alignment on the permeability tensor was characterized. Results show that the degree of anisotropy in permeability depends not only upon particle shape and alignment, but also on the three-dimensional structure of the pack. In random packs, more oblate particles and higher degrees of particle alignment lead to reduced permeability perpendicular to the direction of particle alignment compared to the direction parallel to particle alignment.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 891419
• Report Number(s): PNNL-SA-47141; 2248; 2384a; 6290
• Journal Information: Advances in Water Resources, 29(9):1328-1340, Journal Name: Advances in Water Resources, 29(9):1328-1340
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
ALIGNMENT
ANISOTROPY
ASPECT RATIO
Environmental Molecular Sciences Laboratory
GEOMETRY
HYDRAULICS
PERMEABILITY
SHAPE
SOILS
lattice-Boltzmann
particle alignment
permeability
pore connectivity
pore-scale anisotropy