Article
Mechanics
A. Vamsi Krishna Reddy, Sonu Kumar, K. Anki Reddy
Summary: The study utilized discrete element method simulations to analyze the discharge dynamics of heterogeneous mixtures of dumbbells and discs in two different regimes. The results showed a decrease in flow rate with an increase in the fraction of dumbbells, attributed to geometrical interlocking and hindered rotation of dumbbells. Additionally, stagnant zones and particle blockages were identified as factors contributing to the decrease in flow rate.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
Graham P. Benham, Mike J. Bickle, Jerome A. Neufeld
Summary: This study focuses on upscaling the effect of heterogeneities in porous media, specifically in relation to multiphase flow and the transition between viscous and capillary flow regimes. By modifying the classic Buckley-Leverett problem, the study demonstrates how and where the flow transitions between these regimes and its impact on flooding speeds. The implications of these results in the context of carbon dioxide sequestration are also discussed and compared with field data.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
L. C. Auton, S. Pramanik, M. P. Dalwadi, C. W. MacMinn, I. M. Griffiths
Summary: The study explores the link between microstructure and macroscale flow and transport through the use of homogenisation theory with idealised microstructures. The research focuses on the impact of obstacle size and spacing on macroscopic properties and provides insights for designing filters or studying transport impacts in soft porous media.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Geosciences, Multidisciplinary
Yaniv Edery, Martin Stolar, Giovanni Porta, Alberto Guadagnini
Summary: The study reveals that dissolution and precipitation occur in different locations within the system, with preferential flow paths associated with high conductivity values contributing to a sustained feedback between transport and reaction processes. This leads to the emergence of non-Fickian effective transport features over time.
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2021)
Article
Environmental Sciences
Silvia De Simone, Olivier Bour, Philippe Davy
Summary: Heat transport in fractured aquifers is influenced by the heterogeneity of flow velocity in the fracture system as well as the diffusive exchange between fluid and rock matrix. This study focuses on the impact of diffusive exchange on heat transport response, compared to solute transport governed by pure advective displacement. The behavior observed after the peak differs from matrix diffusion and is driven by the variability of velocity field and fracture aperture field. Theoretical models are derived to predict these pre-asymptotic tails under extreme cases related to specific network structures.
WATER RESOURCES RESEARCH
(2023)
Article
Engineering, Multidisciplinary
Yiran Wang, Eric Chung, Shubin Fu
Summary: In this paper, a local-global multiscale method is proposed for highly heterogeneous stochastic groundwater flow problems. The method combines the reduced basis method and the generalized multiscale finite element method to achieve computational efficiency. The authors provide rigorous analysis and extensive numerical examples to demonstrate the accuracy and efficiency of the method.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Engineering, Mechanical
Ji Lang, Liyun Wang, Qianhong Wu
Summary: This theoretical study discusses the transient squeezing flow through a thin porous gap driven by an oscillating boundary, considering viscous, inertial, and Darcy effects. It reveals that increasing the squeezing depth enhances the oscillation of the velocity profiles due to the alternating dominance of viscous and inertial effects. The presence of porous media stabilizes the fluid field, showcasing potential applications in fields such as biomedical and industrial processes.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Mechanics
Chiyu Xie, Wenhai Lei, Matthew T. Balhoff, Moran Wang, Shiyi Chen
Summary: The use of dispersed polymer microspheres in controlling preferential flow has proven to be more efficient and cost-effective than traditional methods by inducing pressure fluctuations to smartly control the flow. This intelligent mechanism allows for better performance in efficiency and economic aspects, with potential applications in enhancing oil recovery and soil wetting techniques.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Computer Science, Interdisciplinary Applications
He Chen, Shi-Jin Feng
Summary: This study evaluates the abilities of fractal-based hydraulic constitutive models in describing two-phase flows and investigates their application in NAPL-contaminated low-permeability sites. Comparison with experimental results shows that the fractal model accurately describes the two-phase flow behavior. The fractal dimension and intrinsic permeability of soils significantly affect the flow, and the lower part of the low-permeability layer is recommended as the main fracturing and injection zone for optimal efficiency.
COMPUTERS AND GEOTECHNICS
(2023)
Review
Chemistry, Multidisciplinary
Ana Sousa-Castillo, Andrea Marino-Lopez, Begona Puertolas, Miguel A. Correa-Duarte
Summary: Bioorthogonal chemistry has provided a powerful tool for performing biocompatible chemospecific reactions in living systems, particularly in the areas of genetic encoding systems, bioimaging, and cancer therapy. This Minireview focuses on recent advances in the use of heterogeneous catalysts for bioorthogonal reactions, discussing the synthetic strategies of Pd-, Au-, and Cu-based materials, their applications in activating caged fluorophores and prodrugs, and the potential of using external stimuli for targeted drug release in diseased tissues. The review also highlights future directions and challenges in this emerging field.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Environmental Sciences
Gerardo Severino, Francesco De Paola
Summary: This study investigates the steady flow generated by an injecting and a pumping well in a porous formation with spatially variable hydraulic conductivity. The breakthrough curve (BTC) and its moments are computed to analyze the transportation of a solute. By adopting assumptions and simplifications, a simple analytical solution is obtained and the statistical properties of the travel time along the central trajectory are calculated. It is found that the spatial variability enhances dispersion of fluid particles, especially in the early arrivals.
WATER RESOURCES RESEARCH
(2022)
Article
Water Resources
Catherine Spurin, Tom Bultreys, Maja Ruecker, Gaetano Garfi, Christian M. Schleputz, Vladimir Novak, Steffen Berg, Martin J. Blunt, Samuel Krevor
Summary: Intermittent fluid flow has been found to play a significant role in the transport of subsurface multiphase fluids, impacting properties like relative permeability. Higher capillary numbers lead to increased volume of intermittent fluid fluctuations, expanding the flow network and reducing the influence of inertial forces on flow. The study shows that intermittent pathway flow is energetically positioned between laminar and turbulent flow through connected pathways, with implications on relative permeability.
ADVANCES IN WATER RESOURCES
(2021)
Article
Mechanics
Samer A. A. Alokaily
Summary: In this paper, numerical simulations are used to study flow fields in a triple-layer channel with heterogeneous permeable layers. The effects of various parameters such as Darcy number, Reynolds number, porous media model, pressure gradient, etc. on interfacial strain rate and velocity are investigated. The results show that interfacial velocity scales with pressure gradient and Reynolds number, increases with Darcy number, and decreases as the Forchheimer coefficient increases. Interfacial strain rate is found to scale with pressure gradient, Reynolds number, and free-space layer thickness for low Reynolds numbers, and is independent of Darcy number when certain conditions are met.
Article
Materials Science, Multidisciplinary
Paul Seibert, Marreddy Ambati, Alexander Rassloff, Markus Kaestner
Summary: This study approaches reconstruction as a differentiable optimization problem, utilizing a differentiable version of spatial correlations and a multigrid scheme to achieve scalability. Through this approach, exact statistical equivalence is demonstrated with low errors in a short period of time, showing potential to reduce computational effort in reconstructing general random heterogeneous media.
COMPUTATIONAL MATERIALS SCIENCE
(2021)
Article
Water Resources
Abdullah Aljasmi, Muhammad Sahimi
Summary: Advances in instrumentation have enabled high-resolution imaging of heterogeneous porous media, leading to the feasibility of direct numerical simulation of multiphase flow in two- and three-dimensional images. A bottleneck for image-based simulation is the lengthy computation time, which a new approach aims to overcome by utilizing curvelet transformations for denoising and faster computation. The proposed method demonstrates significant speedup in computational efficiency while maintaining accuracy in simulating multiphase flow in porous media.
ADVANCES IN WATER RESOURCES
(2021)
