Article
Computer Science, Interdisciplinary Applications
Guang-Yu Liu, Wen-Jie Xu, Qian Zhou
Summary: This study classifies the contact detection algorithms for spherical and polyhedral particles into polyhedron-polyhedron and sphere-polyhedron contacts based on energy conservation. Through experiments and simulation studies, the effectiveness, stability, and calculation efficiency of the algorithms are validated.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Chemical
Changhua Xie, Huaqing Ma, Tao Song, Yongzhi Zhao
Summary: A polyhedron-sphere contact model based on the deepest point method is proposed for accurate simulation in ore milling process. Experiment and simulation studies demonstrate that the polyhedron-sphere grinding system shows advantages over the traditional spherical system in terms of particle charging, power consumption, energy utilization efficiency, and liner wear. This new model is necessary for more accurate prediction of the grinding process.
Review
Engineering, Chemical
Huaqing Ma, Lianyong Zhou, Zihan Liu, Mengyao Chen, Xiuhao Xia, Yongzhi Zhao
Summary: This paper reviews the development of CFD-DEM investigations for non-spherical particles in the past six years. It covers theoretical models, coupling methods, and applications. The research provides a deeper understanding of the complex flow behaviors between non-spherical particles and fluids, and improves the performance of related industrial processes.
Review
Engineering, Chemical
Kamyar Kildashti, Kejun Dong, Aibing Yu
Summary: This paper reviews the current status of contact force models for non-spherical particles, focusing on their relationships with the geometrical, material, and mechanical properties of the particles. The aim of the review is to improve the existing simplified contact force models used in discrete element method (DEM) simulations by selecting better models. The review covers contact force models based on the extension of the classical Hertz theory, the effects of different variables on contact force, and tangential force models for non-spherical particles. Based on the review, a set of improved contact force models for DEM is recommended to accurately predict contact force and area in emerging areas such as nanoparticles and additive manufacturing.
Article
Engineering, Chemical
Kimiaki Washino, Ei L. Chan, Yukiko Nishida, Takuya Tsuji
Summary: This study examines the validity of the Scaled-Up Particle (SUP) model as a novel coarse grain model for Discrete Element Method (DEM) in simulating a flow of non-spherical and poly-dispersed particles. The SUP model is based on the authors' previous work and the scaling law derived from the continuum assumption of an arbitrary particles flow. The study shows that the SUP model is applicable to both spherical and mono-dispersed particles as well as non-spherical and poly-dispersed particles, as long as the resolution is sufficiently high.
Article
Engineering, Chemical
Hamed Aali, Saman Kazemi, Roxana Saghafian Larijani, Reza Zarghami, Navid Mostoufi
Summary: This study aims to simulate the breakage of nonspherical rod-shaped particles in a pseudo-2D fluidized bed using a coupled computational fluid dynamics and discrete element method. The effect of inlet gas velocity and size of particles on breakage rate and bed height was examined. It was observed that the breakage phenomenon is more severe at the beginning of simulation, and its intensity decreases over time. The breakage rate is directly related to the diameter of constituent spheres of particles and fluidization gas velocity, and most breakages occur near the bed wall.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2023)
Article
Computer Science, Interdisciplinary Applications
Xi Wang, Wei Wu, Hehua Zhu, Hong Zhang, Jeen-Shang Lin, Antonio Bobet
Summary: This study proposes a novel Global Direct Search (GDS) method for accurately detecting contact between arbitrarily shaped convex polyhedral blocks. Compared to the commonly used Common Plane (CP) and GJK algorithms, the GDS method is not affected by false contacts and vanishing contacts, and has higher accuracy and robustness.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Pharmacology & Pharmacy
Sorathan Tanprasert, Chanida Kampeewichean, Shuichi Shiratori, Ratchanon Piemjaiswang, Benjapon Chalermsinsuwan
Summary: In this study, the transport of non-spherical drug particles in the human airway was analyzed using Weibel's airway model. The results showed that the size, shape, and density of drug particles affected the drug deposition, and the airway geometry also played a role in the deposition. These findings provide important recommendations for the design of drug delivery devices and the treatment of patients receiving pharmaceutical aerosols.
INTERNATIONAL JOURNAL OF PHARMACEUTICS
(2023)
Article
Engineering, Chemical
Miguel Angel Romero-Valle, Christoph Goniva, Hermann Nirschl
Summary: The rapid advancement of functional material systems with non-spherical particles has created a demand for technical tools to support process design and understanding of such systems. A novel approach for calculating drag forces and torques for non-spherical particles in liquid media has been proposed in this study.
Article
Engineering, Chemical
C. C. Lai, A. N. Huang, C. Y. Chen, W. Y. Hsu, J. P. K. Seville, H. P. Kuo
Summary: The paper presents an improved spring-damping model for granular flow simulations using contact velocity-dependent restitution coefficient approaches. The model achieves accurate predictions of rebound velocities for different hardness levels of spherical particles.
Article
Construction & Building Technology
Qiang Zhang, Chaojun Jia, Jun Yu, Jiawen Zhou
Summary: A novel algorithm has been developed to accurately represent complex-shaped particles for DEM modeling. The algorithm involves placing spheres in three steps to form a clump, determining the mass properties of the clump based on the corresponding polyhedral particle, and validating the algorithm's performance through an example.
ADVANCES IN CIVIL ENGINEERING
(2021)
Article
Computer Science, Interdisciplinary Applications
Jiayuan Liu, Kevin J. Hanley
Summary: In this study, a series of coupled CFD-DEM simulations were conducted to investigate the influence of particle shape on the pressure distribution, void fraction, and permeability in slurry filtration column tests. The results showed that particles with larger aspect ratios can effectively seal infiltration channels and transfer slurry pressure to effective pressure, thereby contributing to the stability of the tunnel face.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Chemical
Fulei Chen, Huaqing Ma, Zihan Liu, Lianyong Zhou, Yongzhi Zhao
Summary: A particle breakage model based on the particle replacement scheme, using the polyhedral model to describe particles, is proposed in this work to accurately describe the breakage of a large number of particles. Additionally, a fast-cutting algorithm is proposed to reproduce the size distribution of progeny particles determined by the breakage model. The validation and simulation results show satisfactory accuracy, efficiency, and stability of the algorithm.
Article
Engineering, Chemical
Kimiaki Washino, Ei L. Chan, Taichi Tsujimoto, Takuya Tsuji, Toshitsugu Tanaka
Summary: In this work, a CFD-DEM coupling model is developed to simulate gas-liquid-solid flows with non-spherical particles. The model captures the particle shape implicitly using a superquadric function. The model successfully predicts the hydrodynamic and capillary forces on particles with different shapes and contact angles. Virtual experiments of chemical engineering processes show that particle shape significantly affects fluid-particle interactions and particle movement, leading to segregation and preferential alignment.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Engineering, Chemical
Sheng Zhang, Qingsong Zhao, Xueqian Ni
Summary: Field investigations have shown that sand with a history of liquefaction may re-liquefy and cause more severe disasters. The fabric formed during the previous liquefaction plays a significant role in influencing the sand's resistance to re-liquefaction. However, the understanding of fabric evolution during the re-liquefaction process from a microscopic viewpoint is still insufficient. This research aims to numerically study the fabric evolution of sand with different liquefaction histories using 3D DEM.
Article
Engineering, Geological
Lidija Zdravkovic, Richard J. Jardine, David M. G. Taborda, David Abadias, Harvey J. Burd, Byron W. Byrne, Kenneth G. Gavin, Guy T. Houlsby, David J. P. Igoe, Tingfa Liu, Christopher M. Martin, Ross A. McAdam, Alastair Muir Wood, David M. Potts, Jesper Skov Gretlund, Emil Ushev
Article
Energy & Fuels
Ahmad M. Firdaus, Guy T. Houlsby, Thomas A. A. Adcock
PROCEEDINGS OF THE INSTITUTION OF CIVIL ENGINEERS-ENERGY
(2020)
Article
Engineering, Geological
Harvey J. Burd, David M. G. Taborda, Lidija Zdravkovic, Christelle N. Abadie, Byron W. Byrne, Guy T. Houlsby, Kenneth G. Gavin, David J. P. Igoe, Richard J. Jardine, Christopher M. Martin, Ross A. McAdam, Antonio M. G. Pedro, David M. Potts
Article
Engineering, Geological
Byron W. Byrne, Guy T. Houlsby, Harvey J. Burd, Kenneth G. Gavin, David J. P. Igoe, Richard J. Jardine, Christopher M. Martin, Ross A. McAdam, David M. Potts, David M. G. Taborda, Lidija Zdravkovic
Article
Engineering, Geological
Giulia Macaro, Stefano Utili, Christopher M. Martin
Summary: Realistic modelling of transverse pipe-soil interaction is crucial for predicting the behavior of untrenched offshore pipelines. This paper uses the DEM method to study the behavior of a partially embedded pipe segment in sand, providing quantitative predictions of vertical and horizontal forces, displacement trajectory, and qualitative insights into soil failure mechanisms.
Article
Engineering, Geological
Harvey J. Burd, Christelle N. Abadie, Byron W. Byrne, Guy T. Houlsby, Christopher M. Martin, Ross A. McAdam, Richard J. Jardine, Antonio M. G. Pedro, David M. Potts, David M. G. Taborda, Lidija Zdravkovic, Miguel Pacheco Andrade
Article
Engineering, Geological
I. A. Richards, M. F. Bransby, B. W. Byrne, C. Gaudin, G. T. Houlsby
Summary: This study investigates the response of monopile foundations to cyclic lateral loading at different stress levels using various physical modeling techniques. The research shows that a combination of modeling techniques is most effective in exploring the response of monopile foundations, with centrifuge testing being able to simulate full-scale stress levels. Additionally, the results highlight the significant impact of stress level variations on the response of monopile foundations.
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
(2021)
Article
Computer Science, Interdisciplinary Applications
Vasileios Angelidakis, Sadegh Nadimi, Stefano Utili
Summary: The research introduces a code that characterizes the shape of three-dimensional particles, allowing for efficient processing of irregular particles in large samples and generating simplified particle geometries for numerical simulations to characterize the mechanical behavior of particulate assemblies.
COMPUTER PHYSICS COMMUNICATIONS
(2021)
Article
Computer Science, Software Engineering
Vasileios Angelidakis, Sadegh Nadimi, Masahide Otsubo, Stefano Utili
Summary: This study focuses on the role of particle shape in the mechanical and rheological behavior of particulate and granular materials. It introduces a unified framework for generating clumps or clusters to approximate particle morphology, along with a novel generation technique. The effects of clump-generation techniques on granular assemblies' mechanical behavior are investigated through triaxial compression tests.
Article
Computer Science, Interdisciplinary Applications
Stephen K. Suryasentana, Guy T. Houlsby
Summary: The paper introduces a theoretical framework called the convex modular modelling (CMM) framework, which allows for the systematic construction of increasingly complex constitutive models by mixing and matching reusable components from a library of convex base functions. It demonstrates the use of the modified LogSumExp (MLSE) function to develop new yield functions, providing a more accessible path for constitutive modellers to develop robust constitutive models within the hyperplasticity framework.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Engineering, Geological
Yara Barbosa Franco, Stefano Utili, Jefferson Lins Da Silva
Summary: A semi-analytical method has been developed to consider the contribution of the facing element in the stability of geosynthetic reinforced soil walls. The analysis reveals that accounting for cohesion and the presence of the facing element can lead to savings in the amount of reinforcement required.
Article
Engineering, Geological
Y. P. Dong, H. J. Burd, G. T. Houlsby
Summary: Excavation-induced ground movements can have a detrimental influence on nearby structures and facilities. Previous studies have focused on understanding the ground response during excavation and evaluating potential damage. Finite-element analysis has been shown to effectively capture observed excavation behavior. This paper extends a previous case study to investigate settlement effects on nearby buildings and pipelines, considering various factors such as building weight, stiffness, foundation type, ground improvement measures, and pipeline characteristics. The findings provide insights for future applications.
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
(2022)
Article
Multidisciplinary Sciences
Chuang Song, Chen Yu, Zhenhong Li, Stefano Utili, Paolo Frattini, Giovanni Crosta, Jianbing Peng
Summary: This study uses satellite radar observations to investigate the triggering and recovery mechanisms of landslides that are accelerated by earthquakes without immediate failures but showing a prolonged response.
NATURE COMMUNICATIONS
(2022)
Article
Computer Science, Interdisciplinary Applications
G. T. Houlsby, I. A. Richards
Summary: We develop a series of models of the bounding surface type within the context of hyperplasticity theory, in which models are completely defined by the specification of two potentials. We first describe a simple bounding surface type model, based on an equivalent multi-surface model, but with the advantages that (a) only a single yield surface is required and (b) a smooth rather than piecewise linear response is achieved. We then generalise this model in a way that allows it to be calibrated against real data with similar facility to a multi-surface model. Each model is presented in a simple one dimensional form, with generalisations to two dimensions and to a full tensorial form. Finally we give an example of the newly developed model calibrated against a monotonic test, and present comparisons with one-way and two way cycling and two complex bi-directional tests.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Geological
G. T. Houlsby
GEOTECHNICAL ENGINEERING
(2020)
Article
Computer Science, Interdisciplinary Applications
Yinghao Deng, Yang Xia, Di Wang, Yan Jin
Summary: This study investigates the mechanism of hydraulic fracture propagation in laminated shale, develops a numerical solver, and validates the effectiveness of the method through simulation experiments. The study also examines the influence of the interaction between hydraulic fractures and weak interfaces on the mechanical properties of shale.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Zhichao Zhang, Mingfei Feng, Guangshuo Zhou, Zhenglong Xu
Summary: A thermodynamic constitutive model for structured and destructured clays is proposed in this paper. The model includes state-dependent relations of hyperelasticity and plasticity without the concept of yielding surface. The proposed model captures the couplings between elasticity and plasticity and the effects of bonding structure.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Deze Yang, Xihua Chu
Summary: Creep and stress relaxation behaviors in granular materials are influenced by the time-dependent changes in their microstructure, with particle shape playing a significant role. However, the effects of particle shape on these behaviors are still not well understood. In this study, 3D DEM models incorporating the rate process theory and superellipsoids are used to simulate creep and stress relaxation in granular samples with different aspect ratios and blockiness. The results show that both aspect ratio and blockiness have a significant influence on creep and stress relaxation, with aspect ratio affecting creep through contact force ratio and blockiness affecting stress relaxation through variation in normal contact force anisotropy. These findings provide insights into the effects of particle shape on creep and stress relaxation in granular assemblies.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Shahab Amanat, Kourosh Gholami, Reza Rafiee-Dehkharghani, Dipanshu Bansal
Summary: This paper investigates the optimal design of wave barriers using the modified non-dominated sorting genetic algorithm-II (NSGA-II) and the Bloch-Floquet theory. The aim is to find the optimal design of plane wave barriers with a wide bandgap at a low-frequency range and low construction cost. The study develops a modified NSGA-II algorithm to determine the optimal arrangement of concrete in wave barrier unit cells. The performance of the optimal barriers is examined through finite element simulation and their efficacy in attenuating plane S-waves is verified.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Yanlin Su, Guoqing Cai, Fengjie Yin, Yepeng Shan, Annan Zhou
Summary: This paper presents a novel elastic-viscoplastic constitutive model that takes into account particle breakage to reproduce the time-dependent behavior of coarse-grained soil. The model integrates the Unified Hardening (UH) model, the elastic-viscoplastic (EVP) model, and the overstress theory. The relationship between particle breakage and loading rate is established, and state variables associated with the critical state of coarse-grained soil are derived to consider both time and particle breakage. A three-dimensional elastic-viscoplastic constitutive model is constructed by combining a one-dimensional viscoplastic hardening parameter with a secondary consolidation coefficient considering particle breakage. The proposed model requires 19 parameters and effectively describes the influence of time-dependency and particle breakage on the shear, dilatancy, and compression behaviors of coarse-grained soil with different confining pressures or initial void ratios. Experimental data comparisons validate the model's ability to replicate the time-dependent behavior of coarse-grained soil.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Shichao Zhang, Yaqiong Wang, Qidong Gao, Xiaobo Ma, Haixiao Zhou, Zhifeng Wang
Summary: Accurately evaluating and predicting ground settlement during tunnel excavation is essential for ensuring tunnel stability. This study conducted a probabilistic analysis of ground settlement under uncertain soil properties. The results demonstrate that spatially variable soils significantly influence the ground settlement in the vertical direction.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Xu Zhang, Bin Luo, Youjun Xu, Zhiwen Yang
Summary: This paper presents an analytical solution for horizontal displacements induced by small radius curve shield tunneling. The formula is derived based on the image method and Mindlin solution, considering additional thrust, frictional resistance, ground loss, and grouting pressure. The solution is validated with on-site data, demonstrating its reliability and providing a new approach for predicting and controlling stratum horizontal displacements in curve shield tunneling. The study finds that ground loss has the most significant influence on displacements, and soil closer to the tunnel exhibits larger horizontal displacements.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Jian-Hong Wan, Ali Zaoui
Summary: Ground vibrations during earthquakes can cause soil strength loss and structural damage. Rubber-soil mixtures (RSM) have shown promise in reducing residual ground deformation. This study used molecular dynamics simulations to investigate the friction behavior of the rubber-clay interface in RSM systems. The results revealed a direct correlation between normal stress and friction force, with denser soil systems exhibiting higher friction forces.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Hongying Wang, Qiang Zhang, Peinan Wu, Yanjing Li, Lijun Han, Guilei Han
Summary: In addition to the Mohr-Coulomb and Hoek-Brown criteria, other nonlinear functions are used to describe the plastic response of rock mass. This paper derived the equivalent cohesive strength, frictional angle, and dilatancy angle for nonlinear yield and plastic flow rock masses. The solution for a circular tunnel in any nonlinear yield and plastic flow rock masses was derived and verified using a numerical procedure. The analysis of strain-softening rock masses under two assumed nonlinear yield criteria was also studied.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Zhijun Wu, You Wu, Lei Weng, Mengyi Li, Zhiyang Wang, Zhaofei Chu
Summary: This study proposed a machine learning approach to predict the uniaxial compression strength (UCS) and elastic modulus (E) of rocks. By measuring meso-mechanical parameters and developing grain-based models, a database with 225 groups of data was established for prediction models. The optimized kernel ridge regression (KRR) and gaussian process regression (GPR) models achieved excellent performance in predicting UCS and E.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Mingjun Zhou, Zhenming Shi, Chong Peng, Ming Peng, Kahlil Fredrick E. Cui, Bo Li, Limin Zhang, Gordon G. D. Zhou
Summary: In this paper, the erosion and deposition processes during overtopping dam breaching are simulated using a novel method (ED-SPH). The proposed model is able to capture the complex behaviors of dam soil erosion, entrainment, and depositions. Soil deposition hinders particle movement and reduces water velocity at the water-soil interface.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
C. Chavez-Negrete, F. J. Dominguez-Mota, R. Roman-Gutierrez
Summary: To accurately simulate groundwater flow in porous layered media, it is important to consider all environmental factors and use a generalized finite differences scheme as a meshless method for spatial discretization. This approach ensures robustness and accuracy of the numerical solution.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Shuairun Zhu, Lulu Zhang, Lizhou Wu, Lin Tan, Haolong Chen
Summary: This paper investigates the effectiveness of the cascadic multigrid method applied to the improved Picard iteration method for solving nonlinear problems in deforming variably saturated porous media. Two improved Picard iteration methods are proposed, and their effectiveness is verified through numerical examples. The results show that the improved methods have faster convergence and higher computational efficiency compared to the classical method.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Yuan Cao, Yan-Guo Zhou, Kyohei Ueda, Yun-Min Chen
Summary: Investigated shear stress responses of enclosed soil in deep soil mixing (DSM) grid-improved ground, and revealed the characteristics of the waist effect and mathematical model for shear stress reduction ratio.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Jinfan Chen, Zhihong Zhao, Jintong Zhang
Summary: This study develops data-driven criteria to estimate the peak shear strength (PSS) of rock fractures, considering the effects of surface roughness features. A high-quality dataset is created using particle-based discrete element method and diamond-square algorithm. Tree-based models and convolutional neural network are trained to predict the PSS of rock fractures, and their reliability is verified using experimental data.
COMPUTERS AND GEOTECHNICS
(2024)