A5059887008- Groundwater flow and contamination studies
- CO2 Sequestration and Geologic Interactions
- Radioactive element chemistry and processing
- Hydrocarbon exploration and reservoir analysis
- Hydraulic Fracturing and Reservoir Analysis
- Enhanced Oil Recovery Techniques
- Lattice Boltzmann Simulation Studies
- Methane Hydrates and Related Phenomena
- Soil and Unsaturated Flow
- Groundwater and Isotope Geochemistry
- Radioactive contamination and transfer
- Mine drainage and remediation techniques
- Nuclear physics research studies
- Advanced Mathematical Modeling in Engineering
- Heat and Mass Transfer in Porous Media
- Drilling and Well Engineering
- Reservoir Engineering and Simulation Methods
- Nuclear and radioactivity studies
- Scientific Computing and Data Management
- Geological Modeling and Analysis
- Distributed and Parallel Computing Systems
- Geothermal Energy Systems and Applications
- Molecular spectroscopy and chirality
- Atmospheric and Environmental Gas Dynamics
- Geochemistry and Geologic Mapping
University of New Mexico
2018-2023
OFM Research (United States)
2013-2021
Southwest Sciences (United States)
2015-2017
Norte Maar
2016
Sandia National Laboratories California
2015
Los Alamos National Laboratory
2005-2014
United States Department of Commerce
2010
Pacific Northwest National Laboratory
2010
Office of Scientific and Technical Information
2010
National Technical Information Service
2010
A general description of the mathematical and numerical formulations used in modern reactive transport codes relevant for subsurface environmental simulations is presented. The are followed by short descriptions commonly available simulators that consider continuum representations flow, transport, reactions porous media. These applicable to most benchmark problems included this special issue. list described briefly here includes PHREEQC, HPx, PHT3D, OpenGeoSys (OGS), HYTEC, ORCHESTRA,...
[1] To better inform the subsurface scientist on expected performance of parallel simulators, this work investigates reactive multiphase flow and multicomponent biogeochemical transport code PFLOTRAN as it is applied to several realistic modeling scenarios run Jaguar supercomputer. After a brief introduction code's layout design, PFLOTRAN's (measured through strong weak scalability analyses) evaluated in context conceptual model layout, software algorithmic known hardware limitations. scales...
In this work, a multicomponent lattice Boltzmann (LB) model is presented for simulating reactive transport in porous media at the pore scale. model, set of distribution functions introduced to simulate fluid flow and solute transport. The takes into account advection, diffusion, homogeneous reactions among multiple aqueous species, heterogeneous between solution minerals, as well changes solid geometry. Homogeneous are described through local equilibrium mass action relations. Mineral...
In this paper, we improve the lattice Boltzmann pore‐scale model for multicomponent reactive transport in porous media developed a previous study. Instead of applying thermal boundary condition to solute transport, rigorously derive distribution function total concentration. This is achieved first by correcting an expression particle terms corresponding concentration and its gradient then deriving using relation that nonequilibrium portion opposite directions takes on signs. We implement new...
Laboratory experiments, pore‐scale simulations, and continuum (Darcy) ‐scale simulations were used to study mixing‐induced precipitation in porous media. In the experimental investigation, solutions containing Na 2 CO 3 CaCl each injected different halves of a quasi two‐dimensional flow cell filled with quartz sand. As result situ mixing between two solutions, narrow calcite precipitate layer (less than 5 mm wide) more or less uniform width was formed individual solutions. Pore‐scale...
High‐resolution, three‐dimensional, reactive flow and transport simulations are carried out to describe the migration of hexavalent uranium [U(VI)] at Hanford 300 Area bordering Columbia River better understand persistence plume site. The computer code PFLOTRAN developed under a DOE SciDAC‐2 project is employed in that executed on ORNL's Cray XT4/XT5 supercomputer Jaguar. conceptual model used based recognition three distinct phases or time periods evolution U(VI) plume. These correspond (1)...
Abstract. Degradation of near-surface permafrost due to changes in the climate is expected impact hydrological, ecological and biogeochemical responses Arctic tundra. From a hydrological perspective, it important understand movement various phases water (gas, liquid ice) during freezing thawing soils. We present new non-isothermal, single-component (water), three-phase formulation that treats air as an inactive component. This single component model works well produces similar results more...
CO<sub>2</sub> trapping mechanisms in geologic sequestration are the specific processes that hold underground porous formations after it is injected. The main of interest include (1) fundamental confinement mobile phase under low-permeability caprocks, or stratigraphic trapping, (2) conversion to mineral precipitates, (3) dissolution <i>in situ</i> fluid, solubility and (4) by surface tension (capillary force) and, correspondingly, remaining media as an immobile phase, residual trapping....
Reactive transport equations are solved at the pore scale using lattice Boltzmann (LB) method, and results upscaled volume averaging over a representative elemental fit to multiscale continuum model. The model accounts for local concentration gradients within diffusion‐dominated matrix domains that coupled primary fluid. In general it is found formulation required pore‐scale results. However, also demonstrated in some cases, processes may be represented by single‐continuum employing...
We develop a new, lattice effects‐free Boltzmann model for simulating crystal growth from supersaturated solution. Simulations of single or multiple nuclei in domain initially filled with solution are presented, such as the case gas hydrate formation. find that process changes diffusion‐controlled to surface reaction‐controlled, transforms open cluster‐type structure, via compact coral‐type circular and correspondingly, fractal dimension structure increases value close diffusion‐limited...