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Analysis Of Solute Mixing At The Pore Scale Using Micromodels And Lattice Boltzmann Finite Volume Modeling
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Book Synopsis Analysis of Solute Mixing at the Pore-scale Using Micromodels and Lattice-Boltzmann Finite Volume Modeling by : Thomas W. Willingham
Download or read book Analysis of Solute Mixing at the Pore-scale Using Micromodels and Lattice-Boltzmann Finite Volume Modeling written by Thomas W. Willingham and published by . This book was released on 2006 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: Transverse mixing has been shown to often be the controlling mechanisms for degradation of contaminants in groundwater. For a conservative contaminant, downgradient concentrations depend on initial source zone concentrations and the extent to which the contaminant mixes (i.e., dilutes) with surrounding groundwater. For a (bio)reactive contaminant, downgradient concentrations also depend on the rate of reaction. In this work I examine the effects of porous media structure (geometry) on the extent of a bi-molecular reaction utilizing a combination of pore scale modeling and high-resolution 2D micromodels. To evaluate reactive transport, two reactive substrates are introduced into a network of pores via two separate and parallel fluid streams. The substrates mix within the porous media via transverse dispersion and react. In micromodel experiments, the reaction forms a fluorescent product which is quantified utilizing fluorescent microscopy. Experimental micromodel results are compared directly with simulations from a pore scale lattice-Boltzmann (LB) finite volume model (FVM) utilizing identical pore structures and flow rates. The LB method is used to solve for interstitial pore velocities. Reactive transport is simulated by combining pore velocities from the LB model with a reactive transport FVM model. Pore scale modeling and experimental results are up-scaled to determine transverse dispersion coefficients at the continuum scale. Results from pore scale simulations and micromodel experiments indicate that (i) LB-FVM is able to capture the mechanisms controlling mixing-limited reactive transport in 2D micromodel experiments, (ii) flow focusing in high conductivity preferential flow zones enhances reactive transport, (iii) grain orientation has a significant effect on extent of mixing and product formation, (iv) grain size (as is commonly used) is not an accurate predictor of mixing, and (v) intra-particle porosity does not have a significant effect on steady-state pore-scale transverse mixing. Finally, excellent agreement between reactive micromodel experiments and forward modeled continuum predictions of reactive transport determined from up-scaled conservative micromodel experimental results was found. This study suggests that sub-continuum effects such as grain orientation, flow focusing, and effective interfacial plume area can play an important role in overall extent of mixing and reaction in groundwater flow, and hence may need to be considered when evaluating reactive transport at the continuum scale.
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2007 with total page 960 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Lattice Boltzmann Method And Its Application In Engineering by : Zhaoli Guo
Download or read book Lattice Boltzmann Method And Its Application In Engineering written by Zhaoli Guo and published by World Scientific. This book was released on 2013-03-25 with total page 419 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lattice Boltzmann method (LBM) is a relatively new simulation technique for the modeling of complex fluid systems and has attracted interest from researchers in computational physics. Unlike the traditional CFD methods, which solve the conservation equations of macroscopic properties (i.e., mass, momentum, and energy) numerically, LBM models the fluid consisting of fictive particles, and such particles perform consecutive propagation and collision processes over a discrete lattice mesh.This book will cover the fundamental and practical application of LBM. The first part of the book consists of three chapters starting form the theory of LBM, basic models, initial and boundary conditions, theoretical analysis, to improved models. The second part of the book consists of six chapters, address applications of LBM in various aspects of computational fluid dynamic engineering, covering areas, such as thermo-hydrodynamics, compressible flows, multicomponent/multiphase flows, microscale flows, flows in porous media, turbulent flows, and suspensions.With these coverage LBM, the book intended to promote its applications, instead of the traditional computational fluid dynamic method.
Book Synopsis Pore Scale Modeling of Fluid Transport Using Lattice Boltzmann Methods by : N. S. Martys
Download or read book Pore Scale Modeling of Fluid Transport Using Lattice Boltzmann Methods written by N. S. Martys and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Accelerated Lattice Boltzmann Model for Colloidal Suspensions by : Hassan Farhat
Download or read book Accelerated Lattice Boltzmann Model for Colloidal Suspensions written by Hassan Farhat and published by Springer Science & Business Media. This book was released on 2014-04-12 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt: Colloids are ubiquitous in the food, medical, cosmetics, polymers, water purification, and pharmaceutical industries. The thermal, mechanical, and storage properties of colloids are highly dependent on their interface morphology and their rheological behavior. Numerical methods provide a convenient and reliable tool for the study of colloids. Accelerated Lattice Boltzmann Model for Colloidal Suspensions introduce the main building-blocks for an improved lattice Boltzmann–based numerical tool designed for the study of colloidal rheology and interface morphology. This book also covers the migrating multi-block used to simulate single component, multi-component, multiphase, and single component multiphase flows and their validation by experimental, numerical, and analytical solutions. Among other topics discussed are the hybrid lattice Boltzmann method (LBM) for surfactant-covered droplets; biological suspensions such as blood; used in conjunction with the suppression of coalescence for investigating the rheology of colloids and microvasculature blood flow. The presented LBM model provides a flexible numerical platform consisting of various modules that could be used separately or in combination for the study of a variety of colloids and biological flow deformation problems.
Book Synopsis Pore Scale Computational Fluid Dynamic Modeling by : Joshua Larsen
Download or read book Pore Scale Computational Fluid Dynamic Modeling written by Joshua Larsen and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Applied Groundwater Modeling by : Mary P. Anderson
Download or read book Applied Groundwater Modeling written by Mary P. Anderson and published by Academic Press. This book was released on 2015-08-13 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt: This second edition is extensively revised throughout with expanded discussion of modeling fundamentals and coverage of advances in model calibration and uncertainty analysis that are revolutionizing the science of groundwater modeling. The text is intended for undergraduate and graduate level courses in applied groundwater modeling and as a comprehensive reference for environmental consultants and scientists/engineers in industry and governmental agencies. Explains how to formulate a conceptual model of a groundwater system and translate it into a numerical model Demonstrates how modeling concepts, including boundary conditions, are implemented in two groundwater flow codes-- MODFLOW (for finite differences) and FEFLOW (for finite elements) Discusses particle tracking methods and codes for flowpath analysis and advective transport of contaminants Summarizes parameter estimation and uncertainty analysis approaches using the code PEST to illustrate how concepts are implemented Discusses modeling ethics and preparation of the modeling report Includes Boxes that amplify and supplement topics covered in the text Each chapter presents lists of common modeling errors and problem sets that illustrate concepts
Book Synopsis Reactive Transport in Porous Media by : Peter C. Lichtner
Download or read book Reactive Transport in Porous Media written by Peter C. Lichtner and published by Walter de Gruyter GmbH & Co KG. This book was released on 2018-12-17 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume 34 of Reviews in Mineralogy focuses on methods to describe the extent and consequences of reactive flow and transport in natural subsurface systems. Since the field of reactive transport within the Earth Sciences is a highly multidisciplinary area of research, including geochemistry, geology, physics, chemistry, hydrology, and engineering, this book is an attempt to some extent bridge the gap between these different disciplines. This volume contains the contributions presented at a short course held in Golden, Colorado, October 25-27, 1996 in conjunction with the Mineralogical Society of America's (MSA) Annual Meeting with the Geological Society of America in Denver, Colorado.
Book Synopsis Introduction To The Lattice Boltzmann Method, An: A Numerical Method For Complex Boundary And Moving Boundary Flows by : Takaji Inamuro
Download or read book Introduction To The Lattice Boltzmann Method, An: A Numerical Method For Complex Boundary And Moving Boundary Flows written by Takaji Inamuro and published by World Scientific. This book was released on 2021-11-19 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book introduces the fundamentals and applications of the lattice Boltzmann method (LBM) for incompressible viscous flows. It is written clearly and easy to understand for graduate students and researchers.The book is organized as follows. In Chapter 1, the SRT- and MRT-LBM schemes are derived from the discrete Boltzmann equation for lattice gases and the relation between the LBM and the Navier-Stokes equation is explained by using the asymptotic expansion (not the Chapman-Enskog expansion). Chapter 2 presents the lattice kinetic scheme (LKS) which is an extension method of the LBM and can save memory because of needlessness for storing the velocity distribution functions. In addition, an improved LKS which can stably simulate high Reynolds number flows is presented. In Chapter 3, the LBM combined with the immersed boundary method (IB-LBM) is presented. The IB-LBM is well suitable for moving boundary flows. In Chapter 4, the two-phase LBM is explained from the point of view of the difficulty in computing two-phase flows with large density ratio. Then, a two-phase LBM for large density ratios is presented. In Appendix, sample codes (available for download) are given for users.
Book Synopsis Pore-scale Simulation of Multiphase Flow Using Lattice Boltzmann Method by : Jingwei Huang
Download or read book Pore-scale Simulation of Multiphase Flow Using Lattice Boltzmann Method written by Jingwei Huang and published by . This book was released on 2016 with total page 89 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Modeling Solute Diffusion in the Presence of Pore-Scale Heterogeneity by :
Download or read book Modeling Solute Diffusion in the Presence of Pore-Scale Heterogeneity written by and published by . This book was released on 1999 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: A range of pore diffusivities, D{sub p}, is implied by the high degree of pore-scale heterogeneity observed in core samples of the Culebra (dolomite) Member of the Rustler formation, NM. Earlier tracer tests in the culebra at the field-scale have confirmed significant heterogeneity in diffusion rate coefficients (the combination of D{sub p} and matrix block size). In this study, expressions for solute diffusion in the presence of multiple simultaneous matrix diffusivities are presented and used to model data from eight laboratory-scale diffusion experiments performed on five Culebra samples. A lognormal distribution of D{sub p} is assumed within each of the lab samples. The estimated standard deviation ([sigma]{sub d}) of In(D{sub p}) within each sample ranges from 0 to 1, with most values lying between 0.5 and 1. The variability over all samples leads to a combined [sigma]{sub d} in the range of 1.0 to 1.2, which appears to be consistent with a best-fit statistical distribution of formation factor measurements for similar Culebra samples. A comparison of the estimation results to other rock properties suggests that, at the lab-scale, the geometric mean of D{sub p} increases with bulk porosity and the quantity of macroscopic features such as vugs and fractures. However, [sigma]{sub d} appears to be determined by variability within such macroscopic features and/or by micropore-scale heterogeneity. In addition, comparison of these experiments to those at larger spatial scales suggests that increasing sample volume results in an increase in [sigma]{sub d}.
Book Synopsis Modeling Single-phase Flow and Solute Transport Across Scales by : Yashar Mehmani
Download or read book Modeling Single-phase Flow and Solute Transport Across Scales written by Yashar Mehmani and published by . This book was released on 2014 with total page 586 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flow and transport phenomena in the subsurface often span a wide range of length (nanometers to kilometers) and time (nanoseconds to years) scales, and frequently arise in applications of CO2 sequestration, pollutant transport, and near-well acid stimulation. Reliable field-scale predictions depend on our predictive capacity at each individual scale as well as our ability to accurately propagate information across scales. Pore-scale modeling (coupled with experiments) has assumed an important role in improving our fundamental understanding at the small scale, and is frequently used to inform/guide modeling efforts at larger scales. Among the various methods, there often exists a trade-off between computational efficiency/simplicity and accuracy. While high-resolution methods are very accurate, they are computationally limited to relatively small domains. Since macroscopic properties of a porous medium are statistically representative only when sample sizes are sufficiently large, simple and efficient pore-scale methods are more attractive. In this work, two Eulerian pore-network models for simulating single-phase flow and solute transport are developed. The models focus on capturing two key pore-level mechanisms: a) partial mixing within pores (large void volumes), and b) shear dispersion within throats (narrow constrictions connecting the pores), which are shown to have a substantial impact on transverse and longitudinal dispersion coefficients at the macro scale. The models are verified with high-resolution pore-scale methods and validated against micromodel experiments as well as experimental data from the literature. Studies regarding the significance of different pore-level mixing assumptions (perfect mixing vs. partial mixing) in disordered media, as well as the predictive capacity of network modeling as a whole for ordered media are conducted. A mortar domain decomposition framework is additionally developed, under which efficient and accurate simulations on even larger and highly heterogeneous pore-scale domains are feasible. The mortar methods are verified and parallel scalability is demonstrated. It is shown that they can be used as "hybrid" methods for coupling localized pore-scale inclusions to a surrounding continuum (when insufficient scale separation exists). The framework further permits multi-model simulations within the same computational domain. An application of the methods studying "emergent" behavior during calcite precipitation in the context of geologic CO2 sequestration is provided.
Book Synopsis Pore-scale Lattice Boltzmann Simulations of Inertial Flows in Realistic Porous Media by : Chukwudi Chukwudozie
Download or read book Pore-scale Lattice Boltzmann Simulations of Inertial Flows in Realistic Porous Media written by Chukwudi Chukwudozie and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Lattice-Boltzmann Accuracy in Pore-scale Flow Simulation by : Robert Sullivan Maier
Download or read book Lattice-Boltzmann Accuracy in Pore-scale Flow Simulation written by Robert Sullivan Maier and published by . This book was released on 2010 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Lattice Boltzmann Simulation of Immiscible Two Phase Flow at the Pore Scale by : Wenshi Chen
Download or read book Lattice Boltzmann Simulation of Immiscible Two Phase Flow at the Pore Scale written by Wenshi Chen and published by . This book was released on 2011 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Pore-scale Flow and Transport Calculations Using the Lattice Boltzmann Method by : Robert Sullivan Maier
Download or read book Pore-scale Flow and Transport Calculations Using the Lattice Boltzmann Method written by Robert Sullivan Maier and published by . This book was released on 1998 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Pore-scale Study on Porous Media Flows with Chemical Reaction Using Lattice Boltzmann Method by : Timan Lei
Download or read book Pore-scale Study on Porous Media Flows with Chemical Reaction Using Lattice Boltzmann Method written by Timan Lei and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
