Three-dimensional microscale flow simulation and colloid transport modeling in saturated soil porous media

Gao, Hui; Qiu, Charmaine Q.; Fan, Dimin; Jin, Yan; Wang, Lian‐Ping

doi:10.1016/j.camwa.2009.08.057

Cited by 10 publications

(5 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The model developed in our study provides a useful framework that can be systematically made more complex and accurate by including factors and physical processes not considered in this study. Recently, we have extended the model to three‐dimensional porous media (Gao et al, 2010). The Lagrangian trajectory approach allows consideration of chemical and physical heterogeneities, such as charge variations and surface roughness.…”

Section: Discussionmentioning

confidence: 99%

Pore‐Scale Numerical and Experimental Investigation of Colloid Retention at the Secondary Energy Minimum

Qiu

Han

Gao

et al. 2012

Vadose Zone Journal

Self Cite

View full text Add to dashboard Cite

Mechanistic understanding of colloid retention and transport in porous media is important in many environmental processes and applications. In this study, we characterized and quantified colloid retention under unfavorable attachment conditions through modeling coupled with pore‐scale experiments, focusing on the effects of solution ionic strength and interstitial flow speed. A computational approach was developed to simulate the motion of colloids suspended in pore‐scale flow through a network of grain packing in a bounded channel. Simulation results showed that colloids could only be retained at the secondary energy minimum (SEmin) due to the presence of the high repulsive energy barrier (above 1500 kT). The fraction of colloids that can move into the SEmin well and be subsequently retained by the attractive van der Waals force is controlled by the competition of hydrodynamic transport along the streamline and Brownian shifting across the streamline. The tangential hydrodynamic force could slowly drive retained colloids toward the rear stagnation region along the surface, leading to accumulation of retained colloids. The retention at SEmin is dynamically irreversible when the SEmin depth reaches about −4 kT. These mechanistic insights explain well the dependence of the retention ratio on flow speed at a given ionic strength as well as the saturation of the retention ratio with ionic strength at a prescribed flow speed. Furthermore, for a given ionic strength, there is a critical flow speed below which Brownian motion dominates the colloid retention rate, leading to a very strong dependence of surface coverage on flow speed. These simulation results were confirmed by experimental confocal‐microscopy observations in capillary porous channels as well as by other published results, supporting the mechanistic findings.

show abstract

Section: Discussionmentioning

confidence: 99%

Pore‐Scale Numerical and Experimental Investigation of Colloid Retention at the Secondary Energy Minimum

Qiu

Han

Gao

et al. 2012

Vadose Zone Journal

Self Cite

View full text Add to dashboard Cite

show abstract

“…The fact that multiple alternative models with significantly different process conceptualizations could fit the column‐scale observations equally well underlines the potential danger of inferring validity of assumed process models from their ability to be fitted to limited observations. Interestingly, this situation has motivated a new line of ongoing research based on pore‐scale simulation and observation of colloidal transport (Li et al 2006, 2010a, 2010b; Johnson et al 2007; Torkzaban et al 2008; Gao et al, 2010) that holds promise for elucidating the actual mechanisms that are responsible for the observed phenomena. Combining observations of bacterial breakthrough with profiles in adsorbed bacteria at the field scale, however, has yet to be accomplished and will be critical to scaling up from the pore‐scale to kilometer scale.…”

Section: Shortcomings Of Cft For Quantifying Bacterial Transport Procmentioning

confidence: 99%

Lessons Learned from Bacterial Transport Research at the South Oyster Site

Scheibe¹,

Hubbard

Onstott

et al. 2011

Ground Water

View full text Add to dashboard Cite

“…From a computational viewpoint, the advantages of LBM include its algorithm simplicity, intrinsic data locality (thus straightforward to perform parallel computation), and capability to conveniently incorporate complex fluid-solid and fluid-fluid boundary conditions. Hence, LBM has been widely employed in simulations of complex fluid systems, such as multiphase flows [3,4], complex viscous flows with deformable boundary and complex geometry such as porous media [5][6][7], and micro-scale flows [8,9].…”

Section: Introductionmentioning

confidence: 99%

Designing correct fluid hydrodynamics on a rectangular grid using MRT lattice Boltzmann approach

Zong

Peng

Guo

et al. 2016

Computers & Mathematics with Applications

Self Cite

View full text Add to dashboard Cite

a b s t r a c tWhile the lattice Boltzmann method (LBM) has become a powerful numerical approach for solving complex flows, the standard lattice Boltzmann method typically uses a square lattice grid in two spatial dimensions and cubic lattice grid in three dimensions. For inhomogeneous and anisotropic flows, it is desirable to have a LBM model that utilizes a rectangular grid. There were two previous attempts to extend the multiple-relaxationtime (MRT) LBM to a rectangular lattice grid in 2D, however, the resulting hydrodynamic momentum equation was not fully consistent with the Navier-Stokes equation, due to anisotropy of the transport coefficients. In the present work, a new MRT model with an additional degree of freedom is developed in order to match precisely the Navier-Stokes equation when a rectangular lattice grid is used. We first revisit the previous attempts to understand the origin and nature of anisotropic transport coefficients by conducting an inverse design analysis within the Chapman-Enskog procedure. Then an additional adjustable parameter that governs the relative orientation in the energy-normal stress subspace is introduced. It is shown that this adjustable parameter can be used to fully eliminate the anisotropy of transport coefficients, thus the exact Navier-Stokes equation can be derived on a rectangular grid. Our theoretical findings are confirmed by numerical solutions using three two-dimension benchmark problems, i.e. the channel flow, the cavity flow, and the decaying Taylor-Green vortex flow. The numerical results demonstrate that the proposed model shows remarkably good performance with appropriate choice of model parameters.

show abstract

Three-dimensional microscale flow simulation and colloid transport modeling in saturated soil porous media

Cited by 10 publications

References 29 publications

Pore‐Scale Numerical and Experimental Investigation of Colloid Retention at the Secondary Energy Minimum

Pore‐Scale Numerical and Experimental Investigation of Colloid Retention at the Secondary Energy Minimum

Lessons Learned from Bacterial Transport Research at the South Oyster Site

Designing correct fluid hydrodynamics on a rectangular grid using MRT lattice Boltzmann approach

Contact Info

Product

Resources

About