Article
Water Resources
Alex V. L. Machado, Paulo L. C. Lage, Paulo Couto
Summary: This work introduces a new method called sub-volume analysis (SVA) for calculating macroscopic model parameters and their uncertainties from pore-scale simulations. By applying SVA to pore-network models, the longitudinal dispersion coefficient of the advection-dispersion model (ADM) is calculated. The results obtained with SVA are compared with those from breakthrough curve fitting, demonstrating the accuracy of SVA.
ADVANCES IN WATER RESOURCES
(2023)
Article
Engineering, Chemical
Saeid Khasi, Amir Fayazi, Apostolos Kantzas
Summary: The impact of acoustic excitation on dispersion and mass transfer in porous media was studied through a pore-scale model. Sonication was found to accelerate mass transfer between mobile and immobile regions, increase the dispersion coefficient, and have a greater effect on dispersion compared to mass transfer at lower injection rates. Lower frequencies and higher acceleration amplitudes of propagated waves were shown to enhance dispersion and mass transfer coefficients.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Green & Sustainable Science & Technology
Shuo Leng, Sun-Wei Li, Zhen-Zhong Hu, Hao-Yang Wu, Bin-Bin Li
Summary: The proposed MiM simulation framework aims to lower the threshold for atmospheric simulations by automating and improving the accuracy of pollutant dispersion and wind environment simulations.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Geosciences, Multidisciplinary
Fansheng Xiong, Jiawei Liu, Zhenwei Guo, Jianxin Liu
Summary: In this study, wave propagation in porous media saturated with two immiscible fluids was simulated and predicted. An improved model was proposed to address the singularity issue in the coefficient matrix and simplify the calculations. Numerical examples showed that the improved model performed similarly to the original model in a porous medium containing gas and water, while showing better predictions than the original model in a porous medium with oil and water.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Chemistry, Applied
Fei Li, Yuqi Wang, Xiong Gao, Yujun Wang
Summary: In this study, mesoporous gamma-Al2O3 nanorods with high pore volume and narrow pore size distribution were successfully synthesized via a gibbsite-AACH precursor route in a membrane dispersion microreactor. The effects of reaction temperature, (NH4)2CO3 concentration, and calcination temperature on the samples were investigated. Under optimal conditions, the as-prepared nanorods exhibited high pore volume and narrow pore size distribution. Furthermore, the adsorption performance of the nanorods for Congo red solution was evaluated, showing promising potential in adsorption and other applications.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Physics, Multidisciplinary
Dhawal Buaria, Matthew P. Clay, Katepalli R. Sreenivasan, P. K. Yeung
Summary: Passive scalars advected by three-dimensional Navier-Stokes turbulence exhibit a fundamental anomaly in odd-order moments due to characteristic ramp-cliff structures that violate small-scale isotropy. By developing a simple model, it is demonstrated how small-scale isotropy is restored in the large Schmidt number limit, suggesting a possible correction to the Batchelor length scale in the scalar field.
PHYSICAL REVIEW LETTERS
(2021)
Article
Computer Science, Interdisciplinary Applications
Joanna Badach, Wojciech Wojnowski, Jacek Gebicki
Summary: Urban planning and design solutions have an impact on urban ventilation conditions and can help mitigate atmospheric pollution. However, these solutions are not being widely implemented due to the lack of specific guidelines. Additionally, urban air quality monitoring sites often do not provide comprehensive data for effective air pollution control in relation to urban spatial policy. An integrated approach combining computational fluid dynamics and geographic information system tools were used to investigate the influence of micro-scale urban form on local ventilation conditions and pollution dispersion.
COMPUTERS ENVIRONMENT AND URBAN SYSTEMS
(2023)
Article
Water Resources
Rasoul Soufi Noughabi, Seyed Hossein Mansouri, Amir Raoof
Summary: In this study, the impact of fluid invasion process on the transport and dispersion of chemicals and contaminants in the resident phase was investigated. It was found that the morphology of the interface front and the distribution of the invading phase have a significant influence on mechanical dispersion within the resident phase. The complex distribution of the invading phase under unstable displacement greatly affects mechanical dispersion measures and alters hydrodynamic dispersion measures as well.
ADVANCES IN WATER RESOURCES
(2023)
Article
Engineering, Chemical
Haoran Sun, Shiliang Yang, Guirong Bao, Hua Wang
Summary: The present work investigates the mixing and segregation process of premixed binary particles in a liquid-solid fluidized bed using a computational fluid dynamics-discrete element method. The study reveals the relationship between particle velocity and dispersion coefficient, and explores the effects of particle size ratio and fluidization velocity on the segregation process. The numerical results provide valuable guidance for the optimization design of similar apparatus in chemical operations.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Energy & Fuels
Zhao Chuanfeng, Zang Yuxi, Xie Peilun, Xu Zeyu
Summary: This study focuses on the impact of dead-end structures in micro-scale porous media on flow resistance, proposing a new method for calculating extra resistance. Results indicate that dead-end shape, size, and number significantly influence the extra resistance, with more complex vortex structures leading to larger resistance.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Environmental Sciences
Majid Bayatian, Mansour Rezazadeh Azari, Khosro Ashrafi, Mohammad Javad Jafari, Yadollah Mehrabi
Summary: This study utilized CFD simulation to investigate the dispersion of benzene in a petroleum refinery plant under different atmospheric conditions. It was found that the highest impacts of atmospheric parameters occurred on spring days and autumn nights, while wind speed played a critical role in benzene dispersion.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Julien Maes, Cyprien Soulaine, Hannah P. Menke
Summary: Two novel Volume-of-Solid (VoS) formulations for micro-continuum simulation of mineral dissolution at the pore-scale are presented. The accuracy and efficiency of these methods are validated through comparisons with experiments and numerical simulations.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Construction & Building Technology
Peng-Yi Cui, Feng Yang, Jia-Qi Wang, Wei-Qiu Chen, Yuan-Dong Huang, Wen-Quan Tao
Summary: In this study, numerical models validated by wind-tunnel tests were used to investigate the Re-independence issue and influence region definition for flow and dispersion within the target street-indoor scales. The study examined the effect of ventilation modes and surrounding buildings on the Re-independence of indoor flow and dispersion. The results provide guidelines for accurately modeling the flow and dispersion within the coupled indoor-outdoor scales.
BUILDING AND ENVIRONMENT
(2023)
Article
Energy & Fuels
Andres Pinilla, Miguel Asuaje, Camila Hurtado, Angela Hoyos, Luis Ramirez, Aaron Padron, Nicolas Ratkovich
Summary: Water production has become common in the oil industry, resulting in increased costs and environmental impact. The Viscous Fingering phenomenon, caused by viscosity ratios, is a major issue in heavy oil fields. By studying this phenomenon using 3D CFD modeling with scaled horizontal wells, researchers were able to simulate and analyze the effects of water production at the pore scale. This information is valuable for improving completion and recovery techniques in the oil industry.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Engineering, Chemical
Roseanna M. Neupauer, Eric J. Roth, John P. Crimaldi, David C. Mays, Lauren J. Sather
Summary: This experiment investigates solute transport behavior in the radial direction using a device filled with glass beads and glycerin. The results show that the spreading of concentrations exhibits different patterns during radial outward and inward flows, with a reversal of dispersion indicating incomplete mixing within the pore space.
TRANSPORT IN POROUS MEDIA
(2023)
Review
Mechanics
Brian D. Wood, Xiaoliang He, Sourabh V. Apte
ANNUAL REVIEW OF FLUID MECHANICS, VOL 52
(2020)
Editorial Material
Water Resources
Didier Lasseux, Francisco J. Valdes-Parada, Brian D. Wood
ADVANCES IN WATER RESOURCES
(2021)
Article
Environmental Sciences
Zhangshuan Hou, Huiying Ren, Christopher J. Murray, Xuehang Song, Yilin Fang, Evan Arntzen, Xingyuan Chen, James C. Stegen, Maoyi Huang, Jesus D. Gomez-Velez, Zhuoran Duan, William A. Perkins, Marshall C. Richmond, Timothy D. Scheibe
Summary: The study discusses the importance of hydrologic exchange between river channels and adjacent subsurface environments in influencing water quality and ecosystem function, as well as the need for predictive numerical models to support sustainable watershed management. By using hydromorphic classification to extrapolate outputs from local-scale models to reduced-order models, there is potential to improve predictions of large-scale river corridor hydrobiogeochemical processes.
ENVIRONMENTAL RESEARCH LETTERS
(2021)
Article
Engineering, Civil
Xuehang Song, Yilin Fang, Jie Bao, Huiying Ren, Zhuoran Duan, William Perkins, Huifen Zhou, Zhangshuan Hou, Yunxiang Chen, Tim Scheibe
Summary: Hydrological exchange flows (HEFs) and transit time in a river-aquifer system are important for contaminant plume migration and biogeochemical processes. This study used a sophisticated model to assess the spatial variability of HEFs and transit time in a large river corridor, showing strong correlations between aquifer hydrogeological structure and exchange flux extent. The transit time patterns are complex and influenced by various factors, providing insights for developing reduced-order models for large river systems.
JOURNAL OF HYDROLOGY
(2021)
Article
Chemistry, Physical
Fatemeh Razmjooei, Tobias Morawietz, Ehsan Taghizadeh, Efi Hadjixenophontos, Lukas Mues, Martina Gerle, Brian D. Wood, Corinna Harms, Aldo Saul Gago, Syed Asif Ansar, Kaspar Andreas Friedrich
Summary: In order to enhance the performance of AEMWE, a well-designed liquid/gas diffusion layer (LGDL) termed NiMPL-PTL was developed, which reduced transport polarization and increased contact area, leading to measurable performance improvements in AEMWE.
Article
Water Resources
Beibei Gao, Ehsan Taghizadeh, Brian D. Wood, Roseanne M. Ford
Summary: Chemotactic bacteria facilitate bioremediation of NAPL by transporting oil-degrading bacteria more efficiently to contaminants in groundwater aquifers. Simulation results show that chemotactic bacteria exhibit localized hotspots near NAPL ganglia, but the presence of oil ganglia reduces the recovery rate of bacteria.
ADVANCES IN WATER RESOURCES
(2022)
Article
Computer Science, Interdisciplinary Applications
Jie Bao, Yunxiang Chen, Yilin Fang, Xuehang Song, William Perkins, Zhuoran Duan, Pin Shuai, Huiying Ren, Zhangshuan Hou, Marshall Richmond, Xiaoliang He, Timothy Scheibe
Summary: In this study, a modeling framework is developed to evaluate the hydrologic exchange fluxes and residence times at the river and subsurface interface. The results show that hydrodynamic pressure has an impact on the water exchange between the river and subsurface domain.
ENVIRONMENTAL MODELLING & SOFTWARE
(2022)
Article
Computer Science, Interdisciplinary Applications
Ehsan Taghizadeh, Helen M. Byrne, Brian D. Wood
Summary: In this study, a combination of formal upscaling and data-driven machine learning was used to explicitly close nonlinear transport and reaction process in multiscale tissues. The neural network trained to model the closure problem exhibited good generalizability and high fidelity in predicting the effectiveness factor for tissues with different scale and complexity. This approach not only resulted in an upscaled nonlinear PDE but also identified important source terms for closure and improved the accuracy of the models predicting correction factors.
JOURNAL OF COMPUTATIONAL PHYSICS
(2022)
Article
Engineering, Civil
Xingyuan Chen, Raymond Mark Lee, Dipankar Dwivedi, Kyongho Son, Yilin Fang, Xuesong Zhang, Emily Graham, James Stegen, Joshua B. Fisher, David Moulton, Timothy D. Scheibe
Summary: Watersheds are crucial for water supply and ecosystem health, yet there is a lack of quantification in studying the impacts of extreme events. It is essential to understand the effects of environmental perturbations on watershed systems and develop a data-model fusion system for assessment and parameterization.
JOURNAL OF HYDROLOGY
(2021)
Article
Engineering, Environmental
Lazaro J. Perez, Rishi Parashar, Andrew Plymale, Timothy D. Scheibe
Summary: Microbial biofilms are widely present in porous media, affecting the physical properties and solute transport. The study finds that biofilms play a major role in shaping the observed transport dynamics, enhancing anomalous characteristics and extending the tailing. The presence of biofilm leads to spatially correlated pore structure and intermittent behavior.
Article
Environmental Sciences
Gabriel Perez, Jesus D. Gomez-Velez, Xingyuan Chen, T. Scheibe, Yunxiang Chen, Jie Bao
Summary: Analytical solutions for the three-dimensional groundwater flow equation have been widely used to gain insight about subsurface flow structure. This study demonstrates the advantages of using a pre-assigned frequency spectrum targeting dominant frequencies based on rigorous statistical analysis. The new approach better describes fluxes and residence times for well-defined spatial scales, while presenting similar performance for more complex scenarios.
WATER RESOURCES RESEARCH
(2021)
Review
Environmental Sciences
Dipankar Dwivedi, Carl Steefel, Bhavna Arora, Jill Banfield, John Bargar, Maxim Boyanov, Scott C. Brooks, Xingyuan Chen, Susan S. Hubbard, Dan Kaplan, Kenneth M. Kemner, Peter S. Nico, Edward J. O'Loughlin, Eric M. Pierce, Scott L. Painter, Timothy D. Scheibe, Haruko M. Wainwright, Kenneth H. Williams, Mavrik Zavarin
Summary: This paper reviews the extensive research conducted by the US Department of Energy at representative sites and testbeds, exploring the distribution of contaminants and nutrients in water resources and their interactions with carbon and nitrogen dynamics. The paper also describes state-of-the-art characterization approaches and models for predicting contaminant fate and transport.
ENVIRONMENTAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Yunxiang Chen, Jie Bao, Yilin Fang, William A. Perkins, Huiying Ren, Xuehang Song, Zhuoran Duan, Zhangshuan Hou, Xiaoliang He, Timothy D. Scheibe
Summary: Developing accurate and efficient modeling techniques for streamflow at the tens-of-kilometers spatial scale and multi-year temporal scale is critical for evaluating and predicting the impact of climate- and human-induced discharge variations on river hydrodynamics. In this study, the authors demonstrate the feasibility of three-dimensional hydrodynamic modeling of natural rivers at a 30 km and 5-year scale using OpenFOAM. Through the integration of various techniques, accurate modeling results were achieved with high computational efficiency.
GEOSCIENTIFIC MODEL DEVELOPMENT
(2022)
Article
Computer Science, Artificial Intelligence
Huiying Ren, Xuehang Song, Yilin Fang, Z. Jason Hou, Timothy D. Scheibe
Summary: This study developed simplified models of hydrologic exchange flows and transit time distributions using machine learning methods, integrating field observations and simulation data. The results showed that Random Forest and Extreme Gradient Boosting models achieved 70% to 80% accuracy in the Columbia River Corridor, serving as effective alternatives to computationally demanding numerical models.
FRONTIERS IN ARTIFICIAL INTELLIGENCE
(2021)
Article
Water Resources
Hyun-Seob Song, James C. Stegen, Emily B. Graham, Timothy D. Scheibe
Summary: The development of reliable biogeochemical models requires consideration of microbial interactions with hydrology. The resilience of microbial communities to hydrologic perturbations, influenced by historical contingency, plays a critical role in understanding microbial functional dynamics. Specialized microbial functions exhibit greater historical contingency in resilience compared to redundant functions, with hysteresis predicted in transitions across conditions.
FRONTIERS IN WATER
(2021)