Journal
INTERNATIONAL JOURNAL OF COMPUTATIONAL FLUID DYNAMICS
Volume 22, Issue 7, Pages 493-505Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/10618560802238259
Keywords
porous medium; saturated soil; pore-scale flow; direct numerical simulation; lattice Boltzmann method; colloid retention
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The microscale flow in soil porous media determines the transport of colloids contained in groundwater. In this paper, two completely different computational approaches, namely a mesoscopic lattice Boltzmann approach and a Navier-Stokes based hybrid approach, are applied to simulate pore-scale viscous flows. The porous medium is represented by a channel partially filled with circular (in 2D) or spherical (in 3D) particles. We demonstrate that the two approaches produce almost identical pore-scale flow field, providing a rigorous cross-validation for each approach. A Lagrangian particle-tracking approach is then used to study the transport of colloids in these flows. Due to the competing effects of hydrodynamic forces and electro-chemical interactions, it is shown that enhanced removal of colloids from the fluid by solid surfaces occurs when the residence time of colloids in a given flow passage is increased, in qualitative agreement with pore-scale visualisation experiments using confocal microscopy.
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