Article
Computer Science, Interdisciplinary Applications
Jacques Franc, Romain Guibert, Pierre Horgue, Gerald Debenest, Franck Plouraboue
Summary: An image-based effective medium approximation (EMA) is developed for fast evaluation of transport properties in 3D porous media. By focusing on the local geometrical properties of throats at the pore scale, the method shows the relevance of asymptotic assumptions associated with critical points in throats. The proposed method is cost-efficient and reliable for estimating core sample permeability without the need for computational fluid dynamics computation.
COMPUTATIONAL GEOSCIENCES
(2021)
Article
Mechanics
Mojdeh Rasoulzadeh
Summary: This study investigates the transport of nonreactive tracers in a binary porous medium with randomly packed ellipse fluid-filled cavities. Anomalous transport behaviors, including early arrival time and long tailing, are observed due to the high contrast in medium properties and complex fluid velocity structure. The researchers quantify the transport features using a particle tracking method and propose a continuous time random walk (CTRW) framework to represent an upscaled model. Several key parameters, including cavity aspect ratio, porous background permeability, and the Peclet (Pe) number, are found to have significant effects on the anomalous transport process.
Article
Environmental Sciences
Tolulope Q. Agbaje, Behzad Ghanbarian, Jeffrey D. Hyman
Summary: This study investigates the scale-dependent effective permeability in matrix-fracture systems using numerical simulations and theoretical modeling. The critical fracture density and scaling exponent are found to be linked to reservoir properties and size. The theoretical estimations of effective permeability agree well with numerical simulations in six unseen fractured reservoirs.
WATER RESOURCES RESEARCH
(2023)
Article
Engineering, Multidisciplinary
Gang Lei, Qinzhuo Liao, Shirish Patil, Yang Zhao
Summary: This study presents a novel analytical model for stress dependent permeability of argillaceous porous media considering clay swelling, which has been validated by experimental data and shown to perform well. The research finds that under a given effective stress, the normalized permeability decreases with increasing clay content or increasing clay complete expansion coefficient.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2021)
Article
Mechanics
Duncan R. Hewitt
Summary: This study investigates the effect of a series of thin, horizontal, low-permeability layers on convective motion in a two-dimensional porous medium. High-resolution numerical simulations and simple analytical models are used to explore the role of the Omega parameter and reveal a transition from predominantly diffusive to predominantly advective transfer for intermediate Omega values.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Physics, Fluids & Plasmas
Gerardo Severino, Francesco Giannino, Francesco De Paola, Vittorio Di Federico
Summary: We investigate 2D incompressible inertial flows through porous media and find that the constitutive, nonlinear model can be transformed into a linear one by introducing a new parameter K* encompassing all inertial effects at small scales. For naturally occurring formations at large scales, K* varies erratically, and we analytically compute its counterpart, termed generalized effective conductivity, using the self-consistent approach (SCA). Despite its approximate nature, SCA yields simple results that agree well with Monte Carlo simulations.
Article
Engineering, Petroleum
Faruk Civan
Summary: The effective-stress coefficients of porous-rock formations vary due to different rock properties affected by physical mechanisms of rock deformation. Shock effect and hysteresis are observed in fractured-rock formations and heterogeneous porous rocks, respectively, during loading/unloading processes. A modified power-law equation provides a better correlation for the Biot-Willis coefficient compared to the semilogarithmic and basic power-law equations, offering a full range of applicability and more accurate experimental data matching.
Article
Engineering, Chemical
C. Y. Wang
Summary: This study focuses on the effective permeability of a composite material composed of staggered slats embedded in a porous medium. It is found that both the geometry of the slats and the embedding porous medium contribute to the effective permeability, which is anisotropic in the three principal directions. Detailed pressure and velocity distributions are analyzed using a semi-numerical eigenfunction expansion and point match method.
TRANSPORT IN POROUS MEDIA
(2021)
Article
Mechanics
Marco Dentz, Adama Creppy, Carine Douarche, Eric Clement, Harold Auradou
Summary: Understanding the flow and transport of bacteria in porous media is crucial for bioremediation, biomineralization, and enhanced oil recovery. Recent studies have shown that bacterial motility plays a key role in the dispersion and transport of bacteria.
JOURNAL OF FLUID MECHANICS
(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
S. Sheikhi, C. K. Sahu, M. R. Flynn
Summary: We developed a theoretical model to study two-dimensional gravity current flow in a laterally extensive porous medium with leakage through a discrete fissure. The model considers dispersive mixing between the gravity current and the surrounding ambient and characterizes the degree of dispersion by estimating the buoyancy of the dispersed phase and the separation distance between the bulk nose and the dispersed nose. The amount of dispersion is found to depend on various factors, including the flow conditions upstream of the fissure and the permeability and dimensions of the fissure. The study also shows that dispersion is greater when the gravity current propagates along an inclined barrier compared to a horizontal barrier.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Acoustics
Nicholas P. Chotiros
Summary: The extended Biot model for sands and silts is repurposed to include mud, with modifications to the boundary between pore water and skeletal frame. Revil's relationships are used to simplify input parameters, and the frame elasticity equations are corrected to accommodate the sparse skeletal frame behavior. The model is compared with measurements from different sediments, showing a need for modifications to fit the current data.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2021)
Article
Engineering, Environmental
Shahab Karimifard, Xu Li, Christian Elowsky, Yusong Li
Summary: The study demonstrates that the overall permeability of porous media, flow pathways, and overall/local pressure gradients are highly dependent on biofilm ratio and biofilm permeability when biofilm levels are high and intermediate. However, the impact of biofilm porosity is moderate in these cases. Simplified biofilm geometries can provide reasonable approximations of permeability when biofilm structures are well developed.
Article
Physics, Fluids & Plasmas
Bowen Hu, J. G. Wang
Summary: The study presents a combination approach of fractal theory and lattice Boltzmann method (LBM) to simulate gas diffusion in fractal multiscale microstructures of a nanoporous medium. It is found that effective gas diffusivity in a microstructure is higher for a smaller range of Knudsen number, and bigger pore diameter fractal dimension and smaller tortuosity fractal dimension lead to lower gas diffusion resistance and higher effective gas diffusivity. This combination approach offers a powerful tool for estimating effective gas diffusivity in complex nanoporous media.
Article
Engineering, Chemical
Samuel Richesson, Muhammad Sahimi
Summary: This paper introduces a theoretical approach to compute the effective permeability and electrical conductivity of porous media under pressure deformation, and validates the method's effectiveness through experimental data comparison.
TRANSPORT IN POROUS MEDIA
(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)
Article
Geosciences, Multidisciplinary
Serveh Kamrava, Jinwoo Im, Felipe P. J. de Barros, Muhammad Sahimi
Summary: The combination of deep convolutional neural network (DCNN) and random-walk particle-tracking (RWPT) simulation provides a powerful tool for rapidly and accurately estimating the longitudinal dispersion coefficient DL in flow through porous media, allowing for the study of flow-related phenomena and properties in geological formations.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Engineering, Petroleum
Brandon A. Yokeley, Behzad Ghanbarian, Muhammad Sahimi
Summary: In this study, a new rock typing method based on two-phase flow data was proposed, classifying rocks based on their similarities in the critical pore radius at the same effective water saturation. By converting S-w - k(rw) plots to S-e - r(c) curves and applying a curve clustering method, similar rocks were identified.
Article
Engineering, Chemical
Samuel Richesson, Muhammad Sahimi
Summary: This study presents a novel model for estimating the flow and transport properties of porous media under external pressure, utilizing elastic deformation and particle contact theory. The model accurately predicts the effective permeability of different types of sandstones under varying pressure levels, demonstrating excellent agreement with experimental data.
TRANSPORT IN POROUS MEDIA
(2021)
Article
Engineering, Chemical
Samuel Richesson, Muhammad Sahimi
Summary: This paper introduces a theoretical approach to compute the effective permeability and electrical conductivity of porous media under pressure deformation, and validates the method's effectiveness through experimental data comparison.
TRANSPORT IN POROUS MEDIA
(2021)
Article
Engineering, Chemical
Salome M. S. Shokri-Kuehni, Muhammad Sahimi, Nima Shokri
Summary: This paper summarizes the open challenges regarding saline water evaporation from porous media, focusing on the formation of crystallized porous salt layers during drying and their impact on water losses. Suggestions for future research directions in predicting saline water evaporation from porous media are also provided.
Article
Mechanics
Senyou An, Muhammad Sahimi, Takshak Shende, Masoud Babaei, Vahid Niasar
Summary: In this paper, a pore network model is proposed to simulate thermal transport in flow through three-dimensional unstructured pore networks. The study investigates the effects of pore space heterogeneity, injection flow rate, and shear-thinning rheology on thermal-viscous fingering instability in porous media. The results highlight the importance of designing optimal flow conditions for application purposes.
Article
Engineering, Chemical
Muhammad Sahimi
Summary: Experiments, simulations, and models have shown that the dynamic permeability of porous media can be described by a universal function of the rescaled frequency, regardless of the morphology. Two approaches, the dynamic effective-medium approximation and critical-path analysis, both support the universality of the rescaled dynamic permeability in heterogeneous porous media. This has important implications for the electrical conductivity, formation factor, and diffusion coefficients of porous media.
TRANSPORT IN POROUS MEDIA
(2022)
Article
Chemistry, Physical
Nasrin Torabi, Fatemeh Ebrahimi, G. R. Maktabdaran, Muhammad Sahimi
Summary: This article investigates the impact of nano-junctions on the rate of water transport in a nanostructured system. It reveals that the wall-water friction coefficient increases dramatically with roughness, but water flow in relatively complex nanochannels is still significantly enhanced.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Review
Engineering, Chemical
Muhammad Sahimi, Pejman Tahmasebi
Summary: This article discusses the development of quantum computer algorithms and their potential applications in geoscience. Despite the challenges that still need to be overcome, there are already intermediate-scale quantum computers available for various problems.
TRANSPORT IN POROUS MEDIA
(2022)
Article
Environmental Sciences
Senyou An, Muhammad Sahimi, Vahid Niasar
Summary: Hydrodynamic dispersion in flow through porous media is an essential phenomenon in many geosystems. However, limited studies have focused on dispersion in flow of non-Newtonian fluids. This study used pore-scale simulations to investigate the effects of rheology and flow dynamics on hydrodynamic dispersion. Surprisingly, the simulations revealed a non-monotonic relationship between injection rate and dispersivity, highlighting the need for improved theories of transport in porous materials for non-Newtonian fluids.
WATER RESOURCES RESEARCH
(2022)
Article
Engineering, Chemical
Mehryar Amir Hosseini, Serveh Kamrava, Muhammad Sahimi, Pejman Tahmasebi
Summary: The wettability of porous media significantly impacts the spatial distribution of fluid phases. Computer simulations show that contact angle affects particle dynamics, fluid velocity, and rupture in the pore space. Additionally, increasing contact angle reduces inter-particle interactions and increases drag force, leading to larger particle displacement.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Physics, Fluids & Plasmas
Jinwoo Im, Felipe P. J. de Barros, Sami Masri, Muhammad Sahimi, Robert M. Ziff
Summary: With advancements in instrumentation and computational power, we now have access to large amounts of data for complex phenomena in macroscopically heterogeneous media. The traditional method of averaging equations over heterogeneity is no longer valid, leading to an open question of discovering governing equations for flow and transport processes. In this study, a data-driven approach using stochastic optimization and symbolic regression is proposed to discover these equations, which can be based on experimental data or microscopic simulation. As an example, the equation for anomalous diffusion on the critical percolation cluster is discovered and found to agree with previous proposals.
Retraction
Physics, Fluids & Plasmas
Serveh Kamrava, Pejman Tahmasebi, Muhammad Sahimi, Sepehr Arbabi
Article
Physics, Fluids & Plasmas
Sepehr Arbabi, Muhammad Sahimi
Summary: Extensive simulations of rigidity percolation in large body-centered cubic (bcc) lattices show that topological properties and elastic moduli may undergo a first-order phase transition at a critical point p(ce). This transition is characterized by a stairwise behavior of elastic moduli and the formation of compact, non-fractal clusters as the lattice size increases, indicating a departure from second-order phase transitions typically associated with scale-invariant clusters.
