Article
Energy & Fuels
Li Tao, Li Qian, Hu Yong, Peng Xian, Feng Xi, Zhu Zjanmei, Zhao Zihan
Summary: The study examined the effects of fracture aperture, strike, and connectivity on the permeability of fractured porous media, revealing that a greater strike factor and smaller tortuosity lead to higher permeability. Moreover, higher connectivity coefficient in the fracture network results in higher permeability for fracture-pore media, with a tendency toward dominant channel effects. Ultimately, connectivity in the fracture network has a greater impact on the seepage ability of fracture-pore media compared to fracture aperture and strike.
PETROLEUM EXPLORATION AND DEVELOPMENT
(2021)
Article
Energy & Fuels
Chengfei Luo, Huan Wan, Jinding Chen, Xiangsheng Huang, Shuheng Cui, Jungan Qin, Zhuoyu Yan, Dan Qiao, Zhiqiang Shi
Summary: Estimating core permeability using thin-section images is an economical and less time-consuming method. This study proposes a Fluid-MLP workflow that combines 2D images and fluid flow simulations to estimate 3D permeability models.
Article
Engineering, Chemical
Jianlin Zhao, Feifei Qin, Qinjun Kang, Dominique Derome, Jan Carmeliet
Summary: In this work, a hybrid method coupling a pseudo-potential lattice Boltzmann model (LBM) and a pore network model (PNM) is proposed to simulate drying in porous media. By subdividing the porous medium into pore regions and using different models for different types of pores, the hybrid method combines the accuracy of LBM and the efficiency of PNM, leading to significant reduction of computation time in larger porous systems.
Article
Engineering, Geological
Huaiguang Xiao, Lei He, Jianchun Li, Chunjiang Zou, Chengmeng Shao
Summary: The digital twin modeling technology generates homologous and heterogeneous digital sandstone models based on a single two-dimensional image, showing similarity to CT reconstruction in morphology and parameters of porous media. This study proposes an accurate, stable, rapid, and cost-effective method for predicting the permeability of porous media.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
Article
Water Resources
Ying Da Wang, Traiwit Chung, Arash Rabbani, Ryan T. Armstrong, Peyman Mostaghimi
Summary: Permeability and flow fields are analyzed using PNM and SAS, with a faster and more accurate solution achieved by coupling with LBM. The errors in PNM/SAS can be eliminated with LBM coupling, reaching steady-state conditions in significantly fewer timesteps than LBM-only simulations in tight domains.
ADVANCES IN WATER RESOURCES
(2021)
Article
Thermodynamics
Jiajun Wang, Gangtao Liang, Xiangwei Yin, Shengqiang Shen
Summary: In this study, pool boiling on micro-pillar structured surfaces was investigated using a three-dimensional pseudo potential phase-change lattice Boltzmann method. The joint enhancing effects of surface wettability and pillar geometrical parameters on bubble nucleation and boiling performance were analyzed. It was found that on neutral and hydrophobic surfaces, increasing the spacing of micro pillars delayed nucleation, but reduced the temperature inside the vapor film and improved heat conduction. On hydrophilic surfaces, the impact of pillar spacing on nucleation was non-monotonic and more complex, with an enhanced heat flux and significantly different nucleation positions.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Multidisciplinary Sciences
Fengchang Yang, Andrew G. Stack, Vitalii Starchenko
Summary: Rates and extents of mineral precipitation in porous media are difficult to predict, requiring complex numerical simulation methods. Researchers have developed a multiphase solver that can accurately simulate the dynamic evolution of interfaces and crystal growth directions in the process of mineral precipitation.
SCIENTIFIC REPORTS
(2021)
Article
Environmental Sciences
Yu Bai, Yizhou Xiao, Yiting Qi, Jinglin Qian, Weidong Xuan, Suli Pan, Guojin Sun
Summary: This study uses the Lattice Boltzmann method to simulate the hydrodynamics and pollutant transport in a river network, and optimizes the layout of artificial floating islands. The research provides theoretical reference for the selection and location of artificial floating islands in practical engineering.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Thermodynamics
Yongzan Wen, Guanhua Ni, Xinyue Zhang, Yicheng Zheng, Gang Wang, Zhenyang Wang, Qiming Huang
Summary: This paper investigates the effect of acidification erosion on the pore structure of anthracite using various methods. The results show that HCl has the highest removal efficiency of minerals, leading to improved pore structure and fluid transport capacity in coal samples.
Article
Mechanics
Dong Zhao, Jian Hou, Bei Wei, Haihu Liu, Qingjun Du, Yang Zhang, Zezheng Sun
Summary: This study presents a fast method for predicting displacement fronts in different heterogeneous porous media using deep learning and orthogonal design. By generating displacement schemes with different permeability contrasts, capillary numbers, and viscosity ratios through orthogonal design, and obtaining datasets of displacement fronts through lattice Boltzmann simulation, a prediction network is established based on the U-Net structure. The results show that this method significantly reduces the time required for dataset establishment and network training, and greatly reduces the time needed for network prediction compared to lattice Boltzmann simulation.
Article
Mechanics
Weiwei Wu, Xu Deng, Shuang Ding, Yanjun Zhang, Bing Tang, Binquan Shi
Summary: The laying process is crucial in printing Al2O3 parts using stereolithography technology. In this study, numerical analysis was conducted to investigate the flow behavior. The rheological type of the slurry was determined through measurement of its rheological behavior, and a Sisko model was proposed to describe the non-Newtonian behavior. The modified multiple relaxation time lattice Boltzmann method was validated to improve simulation stability. The study examined the laying process with and without printed solids in the previous layer, considering laying velocity and layer thickness as important factors. The presence of printed solids disrupted the smooth flow, causing vortices and disturbances in both horizontal and vertical velocity components.
Article
Geochemistry & Geophysics
Jiangtao Zheng, Wenhai Lei, Yang Ju, Moran Wang
Summary: The spontaneous imbibition behavior driven by capillary force in the pore space under actual reservoir conditions was studied using an improved multi-component pseudo-potential lattice Boltzmann method. The results showed that imbibition was two times faster and snap-off oil droplets phenomenon was observed under reservoir conditions. Investigating spontaneous imbibition in a real porous structure and under actual reservoir conditions is crucial for understanding the process and uncovering controlling mechanisms.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Engineering, Marine
Yang Liu, Yong Peng
Summary: Through verification and application, this improved LBM model can accurately predict the collapse of cavitation bubbles, including heat transfer, and for the first time, includes the interaction between density and temperature fields in the LBM model.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Engineering, Electrical & Electronic
Wang Xiukun, Chen Hongfei, Li Jingjun, Zhang Lei
Summary: A novel membrane resonant droplet ejector (MRDE) for viscous industrial liquids is proposed in the paper. The effects of voltage amplitude and driving frequency on droplet volume and velocity are explored, and the critical thresholds for MRDE are analyzed, showing a wider printable range compared with traditional piezoelectric printheads.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Article
Chemistry, Multidisciplinary
Andrey Olhin, Aleksey Vishnyakov
Summary: This paper presents characterization of the pore structure and permeability estimation in tight-pore sandstones using Lattice-Boltzmann method simulations. Porosity is characterized by pore volume distribution, pore throat connectivity, and tortuosity. The LBM simulations show good agreement with experiments and existing simulation methods, providing a practical and computationally sound approach for estimating permeability in tight pores.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Geological
K. M. A. S. Bandara, P. G. Ranjith, W. G. P. Kumari
Summary: The study revealed that fractures generated in shale and siltstone formations during hydraulic fracturing exhibit different characteristics, and flow behavior is influenced by factors such as fracture tortuosity and proppant concentration.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Engineering, Environmental
Yi Xue, Jia Liu, P. G. Ranjith, Zhizhen Zhang, Feng Gao, Songhe Wang
Summary: This study conducted triaxial compression tests on coal under different gas pressure conditions to explore the influence mechanism of gas pressure on coal deformation, failure, and energy evolution. The mechanical properties, acoustic emission energy characteristics, and nonlinear characteristics of coal containing gas were obtained based on the test data. A theoretical formula for analyzing energy evolution was introduced and verified by test data. The research results indicate that energy rate can be used as a new effective mechanical parameter to analyze and predict the damage and failure characteristics of coal. The findings on energy dissipation characteristics and the defined ratio of dissipative energy rate and input energy rate provide insights for understanding the fracturing evolution and energy driving mechanism of coal.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)
Article
Construction & Building Technology
M. H. Samarakoon, P. G. Ranjith, W. A. M. Wanniarachchi
Summary: This study examines the effects of carbonation on the properties and mechanisms of cement, showing that alkali-activated cements with higher calcium content exhibit better mechanical properties and a denser microstructure when exposed to carbonate brine.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Thermodynamics
Jizhao Xu, Cheng Zhai, Pathegama Gamage Ranjith, Shuxun Sang, Yong Sun, Yuzhou Cong, Wei Tang, Yangfeng Zheng
Summary: The study investigated the effects of liquid CO2 on coal strength, finding that the coupled effects of liquid CO2 temperature and adsorption can influence coal fracture behavior and crack morphology.
Article
Energy & Fuels
Jizhao Xu, Cheng Zhai, P. G. Ranjith, Shuxun Sang, Xu Yu, Yong Sun, Yuzhou Cong, Yangfeng Zheng, Wei Tang
Summary: The study found that coal affected by liquid CO2 exhibited more complex destruction patterns, larger fractal dimensions, and greater structure degradation. The affected coals showed diverse mechanical responses, with temperature shock and CO2 adsorption potentially leading to crack growth and strength deterioration, ultimately destroying the coal with smaller yield strength.
Article
Energy & Fuels
David Lall, Vikram Vishal, M. V. Lall, P. G. Ranjith
Summary: The study found that gas production was less efficient in the presence of a permeable heterogeneity compared to other scenarios. The permeability affects the vertical extent of dissolved methane volume during thermal stimulation and huff and puff, while well depth influences the radial extent of dissociated molecules.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Shashika Gajanayake, Ranjith Pathegama Gamage, Pabasara Wanniarachchige, Decheng Zhang
Summary: This study conducted molecular dynamic simulations to investigate the effects of temperature, pressure, and initial CO2 concentration on gas replacement characteristics for methane recovery and CO2 storage. The results showed that higher temperatures resulted in greater methane recovery, but diminished CO2 storage capacity. Higher initial CO2 concentrations facilitated better CO2 penetration into the hydrate structure, leading to increased methane recovery and improved CO2 storage.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2022)
Article
Thermodynamics
P. Cheng, C. P. Zhang, Z. Y. Ma, J. P. Zhou, D. C. Zhang, X. F. Liu, H. Chen, P. G. Ranjith
Summary: Nanoindentation tests were conducted to investigate the effects of ScCO2-water treatment on shale matrix micromechanics, revealing significant heterogeneity in the properties of different minerals. Observation of indentation morphologies showed that considerable micro-fractures were generated in clay minerals, correlated to significant plastic deformation and layered crystal structures.
Article
Energy & Fuels
Decheng Zhang, Hao Tang, Xiaogang Zhang, P. G. Ranjith, M. S. A. Perera
Summary: This study investigates the effects of roughness, slit width, and pressure on methane adsorption characteristics by constructing nanoscale slits using graphene instead of shale. The results show that the adsorption configurations depend on the slit width and surface roughness. Rough slits have discontinuous adsorption layers, and weak second adsorption layers form in large slits under high pressures. The inaccessible volume increases with roughness, leading to a reduction in accessible volume. Excess and absolute adsorption decrease with roughness but increase with slit width at the microscopic scale. The Langmuir-Freundlich model fits well with excess adsorption isotherms. Adsorption is found to be more stable in smaller and rougher slits due to the superposition of adsorption potentials.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Geological
K. M. A. S. Bandara, P. G. Ranjith, W. Zheng, D. D. Tannant, V. R. S. De Silva, T. D. Rathnaweera
Summary: This study provides a grain-scale analysis of the fracture evolution mechanisms of proppant crushing, rock fracture damage during proppant embedment, and the influence of realistic reservoir/fracture fluid on proppant embedment. The results reveal that the selection of an appropriate proppant type is vital in quantifying the degree of proppant crushing and embedment within fractures.
Article
Thermodynamics
Guanglei Zhang, P. G. Ranjith, Qiao Lyu
Summary: This study reveals the effects of CO2 on the micro and nano-scale properties of coal, confirms the softening effects of CO2 on coal, and indicates that these changes are reversible to some extent.
Article
Energy & Fuels
B. Balinee, P. G. Ranjith, Herbert E. Huppert
Summary: The article discusses the impact of building material production on global carbon emissions and presents methods to reduce environmental impact through the use of waste and carbon sequestration. By incorporating discarded aluminum foil and industrial waste gases into cement, the performance and sustainability of cement can be improved. This approach significantly reduces carbon emissions, lowers costs, and stores a large amount of CO2.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2022)
Review
Energy & Fuels
T. Amirthan, M. S. A. Perera
Summary: This article presents an overview of different storage technologies and their roles in developing the hydrogen economy. Underground storage methods are suitable for large-scale seasonal storage, while surface storage methods are suitable for smaller capacity and rapid storage cycles.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Geological
V. R. S. De Silva, H. Konietzky, H. Mearten, P. G. Ranjith, W. G. P. Kumari
Summary: This study proposes a novel approach called the hybrid rock pre-conditioning method to enhance the sustainability and efficiency of low-grade ore mining. The method involves the use of soundless cracking demolition agents (SCDAs) to initiate radial fractures in a predrilled host rock, followed by hydraulic stimulation to extend the fractures. The results show that this method can create a high density of fractures around the injection well, and key factors such as rock mass heterogeneity and stress anisotropy affect its performance.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Energy & Fuels
M. H. Samarakoon, P. G. Ranjith
Summary: Ensuring the intactness of cement sheaths is crucial for deep well applications in extreme underground conditions. This study investigates the behavior of wellbore materials, including steel casing, annulus cement sheaths, and surrounding rock formations, under continuous steam injection. The results show that materials in carbonate formations are more vulnerable to stress than those in sandstone formations, and the retention time of maximum temperature in cement sheaths is shorter in sandstone than in carbonate. It is also found that the cement sheaths in compliant formations like sandstone may fail due to tensile cracking along the thinnest thickness.
GEOENERGY SCIENCE AND ENGINEERING
(2023)
