Article
Engineering, Civil
CFvM. Wehlitz, J. S. Schoonees
Summary: The CubilokTM is a new trademarked armour unit developed in South Africa that can be used for various breakwater designs. It is still in the early stages of development and has not been tested in prototype conditions yet.
COASTAL ENGINEERING
(2023)
Article
Engineering, Marine
Deping Cao, Jing Yuan, Hao Chen
Summary: This study explores the feasibility of using the Morison-type equation to convert numerically simulated porous media flow in an armour layer into the forces on a single armour unit, proposing a predictor model consisting of inertial force, drag force, pressure gradient force, and lift force. The calibrated model can reasonably approximate the temporal variation of wave-induced force. However, further research is needed to provide a sufficiently large dataset for calibrating empirical formulas.
Article
Biochemistry & Molecular Biology
Hongwoo Lee, Pil Joon Seo
Summary: Research has discovered small 3D chromatin units in plant genomes that are usually established around individual genes and are influenced by chromatin accessibility. Larger contact domains containing multiple genes were also observed, depending on accessible border regions. Computational modeling successfully simulated the formation of these 3D structures.
NUCLEIC ACIDS RESEARCH
(2023)
Review
Construction & Building Technology
Jiajun Zhang, Rujin Ma, Zichao Pan, Haijun Zhou
Summary: This paper provides a systematic review of mesoscale modeling methods for concrete, focusing on aggregate modeling, collision detection algorithms, and particle-packing algorithms. The advantages, disadvantages, and current challenges of various methods are discussed.
Article
Construction & Building Technology
Xu Yang, Mingzhi Wang
Summary: The study analyzed and discussed the fractal dimension changes during the packing process of a packed particle system, showing that the fractal dimension fluctuated before major immobilization of large particles and became stable after inter-particle contact formation. The differences in fractal dimensions indicated the packed system had higher geometric complexity than the unpacked one, emphasizing the importance of distinguishing between models generated by random allocation and packed models for more realistic concrete simulation.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Engineering, Chemical
C. X. Li, J. Q. Gan, D. Pinson, A. B. Yu, Z. Y. Zhou
Summary: The study used DEM to investigate the effects of dropping height, deposition intensity, and friction coefficient on the packing properties of ellipsoidal particles. The results showed that increasing dropping height led to higher packing density but less ordered bed, significantly affecting the densification process of ellipsoids. Higher deposition intensity decreased packing density but had slight impact on orientational order, while higher sliding friction coefficient dramatically decreased both packing density and orientational order.
Article
Construction & Building Technology
Eliass El Alami, Fatima-Ezzahra Fekak, Luigi Garibaldi, Ahmed Elkhalfi
Summary: A numerical model was developed in this paper to investigate the effects of rebar corrosion on cracking of concrete cover and bond deterioration in RC structures. The results showed that pit size significantly impacts crack paths and length of tensile cracks in concrete, and the accumulation of rust in corrosion pit affects the bond between rebar and concrete cover.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Engineering, Aerospace
Ziwen Li, Xiangyuan Zeng, Tongge Wen, Yonglong Zhang
Summary: This paper introduces the application of the discrete element method (DEM) in analyzing the scientific origin/evolution of asteroids and the landing/sampling of regolith. It proposes a newly-developed DEM algorithm with the Polygonal Contact Model (PCM) to manage contact between non-spherical granules. The paper analyzes four different contact force models and compares their differences and implications in single-collision and multiple-collision scenarios. The study also discusses the feasibility of softening by decreasing the material's Young's modulus.
Article
Engineering, Manufacturing
Ze Chang, Minfei Liang, Yu Chen, Erik Schlangen, Branko Savija
Summary: This study numerically investigates the influence of early-age creep on the buildability of 3D printed concrete and validates the results with experiments. The findings highlight the significant role of initial printing time and material mix design for predicting the buildability of concrete.
ADDITIVE MANUFACTURING
(2023)
Article
Engineering, Mechanical
Javier Sanchez-Haro, Ignacio Lombillo, Guillermo Capellan
Summary: Traditionally, the impact on structures did not take into account the effect of gravitational force due to limited knowledge. It is unclear where the limit is and whether the type of structure affects this limit. This paper introduces a simplified model to calculate the displacement and contact force considering gravity's impact on the structural response. The model is validated with experimental tests on beams and finite element models, and a coefficient is proposed to evaluate if gravity significantly influences the impact before analysis.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2023)
Article
Engineering, Civil
Tolga Kuskun, Jerzy Smardzewski, Ali Kasal
Summary: This study designed and manufactured different types of auxetic dowels, analyzing their installation force, contact pressure, and friction coefficient in particleboard. The auxetic dowels have negative Poisson's ratios, lower installation force than non-auxetic dowels, and lower contact pressures on their surface.
ENGINEERING STRUCTURES
(2021)
Article
Green & Sustainable Science & Technology
Sebastien Remond, Mohamed El Karim Bouarroudj
Summary: The aim of this study is to develop a numerical model to optimize the mixture proportions of concentrated suspensions based on very limited entry data. By applying the model, the numerically determined optimum proportions are successfully compared to experimental results.
Article
Polymer Science
Jingzhou Lu, Han Huang, Yunkai Li, Tong Mou
Summary: The axial compression behavior of FRP-confined concrete-core-encased rebar (FCCC-R) was studied through monotonic axial compression tests on seven groups of FCCC-R specimens and three groups of pure rebar specimens. The tests considered different parameters such as FRP winding angle, number of layers, and slenderness ratio. The results showed that FCCC-R exhibited significant improvement in axial compression behavior compared to pure rebar. A finite element model was constructed and used for parametric analysis, which revealed the impact of different factors on the axial compression behavior of FCCC-R.
Article
Engineering, Civil
Chunfeng Zhao, Kaicheng He, Lunhai Zhi, Xin Lu, Rong Pan, Avinash Gautam, Jingfeng Wang, Xiaojie Li
Summary: The steel-concrete composite structure is gradually being used in seismic and explosion-resistant designs due to its energy dissipation and impact resistance capabilities. Experimental and numerical studies have investigated the blast capacities of different composite slabs and have shown that the steel plate plays a dominant role in resisting blast loads and preventing damage due to its high tensile strength. The proposed empirical formula for mid-span deflection of composite slabs can accurately predict their behavior under blast conditions.
ENGINEERING STRUCTURES
(2021)
Article
Engineering, Chemical
Takeru Yano, Shuji Ohsaki, Hideya Nakamura, Satoru Watano
Summary: This study investigates the effects of particle cohesiveness and plasticity on the compression of bimodal powders using the discrete element method. It finds that the plasticity of particles enhances the effects of fine particle addition. The study emphasizes the importance of determining the optimal addition ratio of fine particles based on the plastic deformability of the material.
ADVANCED POWDER TECHNOLOGY
(2023)
Article
Mathematics, Interdisciplinary Applications
Clement Joulin, Jiansheng Xiang, John-Paul Latham
COMPUTATIONAL PARTICLE MECHANICS
(2020)
Article
Engineering, Chemical
Ado Farsi, Jiansheng Xiang, John-Paul Latham, Mikeal Carlsson, Hugh Stitt, Michele Marigo
Summary: A new component of the combined finite-discrete element method (FDEM) was used to estimate the effects of geometrical features, friction, and energy dissipation parameters on the bulk properties of rigid pellet packs. The study confirmed the applicability of FDEM methods for simulating multi-body problems and provided a basis for further research on multi-physical engineering systems involving catalyst pellets. The numerical simulations matched experimental results, demonstrating the accuracy of the simulated topology of the pellet pack.
Article
Engineering, Marine
Giulio Scaravaglione, John-Paul Latham, Jiansheng Xiang
Summary: This paper evaluates the structural strength of unreinforced concrete armor units Cubipod(R) through a numerical methodology and discusses the sensitivity of breakage to tensile strength and collision angle. The calibration process and validation study provide insights into the crushing and cracking damage of this unit under drop test impact conditions.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Computer Science, Interdisciplinary Applications
Asiri Obeysekara, Pablo Salinas, Claire E. Heaney, Lyes Kahouadji, Lluis Via-Estrem, Jiansheng Xiang, Narakorn Srinil, Andre Nicolle, Omar K. Matar, Christopher C. Pain
Summary: An integrated and parallelized modelling approach is proposed in this paper to solve complex multiphase flow problems, combining various high-order numerical methods and algorithms to increase the accuracy of physics representation and maximize computational efficiency.
ADVANCES IN ENGINEERING SOFTWARE
(2021)
Article
Energy & Fuels
Huajian Wang, Hualin Liao, Jun Wei, Yongwang Liu, Wenlong Niu, John-Paul Latham, Jiansheng Xiang, Jiansheng Liu, Jingkai Chen
Summary: A new model combining plunger movement and nozzle pressure drop is proposed to study the design of intensifiers and characteristics of water jets, with the pressurization performance mainly influenced by the spring.
JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME
(2022)
Article
Engineering, Geological
Bin Chen, Jiansheng Xiang, John-Paul Latham
Summary: In this paper, the influence of inter-grain cementation stiffness on the effective elastic properties of porous sandstone was investigated using an advanced numerical workflow and a theoretical model. The 3D realistic microstructure of Bentheim sandstone was constructed using a micro-CT scan based approach, and loading simulations were run with different inter-grain cementation stiffness. The numerical and theoretical results both indicate that the influence of inter-grain cementation stiffness on the effective elastic properties of porous sandstone is significant.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2023)
Article
Engineering, Geological
Jiansheng Xiang, Bin Chen, John-Paul Latham, Christopher Pain
Summary: Water jet drilling is an effective technique for drilling micro-holes in the subsurface. This study investigates the failure mechanism of rock during water jet drilling and assesses its performance before drilling. The numerical simulations show that rock failure mainly occurs in the weakest Gildehaus sandstone, with most cracks being tensile failures. Increased water back pressure significantly suppresses jet erosion.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2022)
Article
Automation & Control Systems
Bo Zhang, Ziang Hu, Pin Wu, Haiwang Huang, Jiansheng Xiang
Summary: The main causes of earthquakes are crustal movements, plate movements, and collisions. Researchers have been predicting earthquakes using historical seismic data, but this approach ignores the internal patterns of crustal motion and plate movement. This paper proposes a data-driven deep learning model called EPT, which uses gated feature extraction blocks (GFEB) to identify potential patterns in global seismic data and improve mainshock prediction. The experiments show that this approach increases prediction accuracy by up to 50%.
ENGINEERING APPLICATIONS OF ARTIFICIAL INTELLIGENCE
(2023)
Article
Computer Science, Interdisciplinary Applications
Bin Chen, Yuan Wang, Shaoqing Cui, Jiansheng Xiang, John-Paul Latham, Jinlong Fu
Summary: This study developed a new method for generating 2D and 3D granite microstructure models from a 2D image by combining a heterogeneous material reconstruction method with Voronoi tessellation.
ENGINEERING COMPUTATIONS
(2023)
Article
Energy & Fuels
Hua-Jian Wang, Hua-Lin Liao, Jun Wei, Jian-Sheng Liu, Wen-Long Niu, Yong-Wang Liu, Zhi-Chuan Guan, Hedi Sellami, John-Paul Latham
Summary: To solve the problem of rock strength increase caused by high in-situ stress, the study proposes a stress release method using an ultra-high-pressure water jet to create a rock slot in the bottom hole. The stress conditions before and after slotting are analyzed, and the stress release mechanism is clarified. The results show that slotting releases stress through the relief of horizontal stress, distancing the stress concentration zone from the cutting face, and increasing pore pressure due to rock mass expansion. The method and simulation results have significant implications for improving rock-breaking efficiency and understanding the technique.
Article
Engineering, Civil
Kuifeng Zhao, Yufei Wang, Philip L. -F. Liu
Summary: This note provides guidelines for selecting appropriate analytical periodic water wave solutions based on two physical parameters. The guidelines are summarized in a graphic format and the dividing lines between applicable wave theories are determined by the nonlinearity and frequency dispersion ratios.
COASTAL ENGINEERING
(2024)
Article
Engineering, Civil
Jana Haddad, Johanna H. Rosman, Richard A. Luettich, Christine M. Voss
Summary: Understanding wave transformation in marsh vegetation canopies is crucial for assessing nature-based shoreline strategies. This study investigates the challenges of accurately modeling wave dissipation in coastal marshes and proposes a new dimensionless parameter to represent the canopy drag coefficient (C-D). The study finds that uncertainties in vegetation measurements lead to variations in C-D expressions, and suggests using the Cauchy number (Ca) as the more appropriate parameter for larger waves.
COASTAL ENGINEERING
(2024)
Article
Engineering, Civil
Dirk P. Rijnsdorp, Arnold van Rooijen, Ad Reniers, Marion Tissier, Floris de Wit, Marcel Zijlema
Summary: This paper extends the non-hydrostatic wave-flow model SWASH to account for the influence of a depth-uniform ambient current on wave dynamics. The model's ability is verified by comparing predictions to results from linear theory, laboratory experiments, and a spectral wave model. The extended model accurately captures current-induced changes in the wave field and simulations of wave dynamics in the presence of strong opposing currents.
COASTAL ENGINEERING
(2024)
Article
Engineering, Civil
Zhihao Shen, Duruo Huang, Gang Wang, Feng Jin
Summary: In this study, a resolved CFD-DEM coupling procedure was proposed to study the interaction of waves and irregularly shaped armour units. The model was validated by comparing the numerical results with a flume wave erosion test. The influence of armour shape on overtopping discharge, pressure distribution, and vortex structure was also studied.
COASTAL ENGINEERING
(2024)
Article
Engineering, Civil
Xinyu Hou, Zhonghua Weng, Xin Chen, Gengfa Chen
Summary: A single-phase model is proposed to predict sediment motion on vortex rippled bed under wave action. The model takes into account the acceleration effect of bottom sediment, the development of asymmetric boundary layer, and the sediment phase-lag, and successfully predicts the velocity, concentration, and development of sediment cloud on vortex ripples.
COASTAL ENGINEERING
(2024)
Article
Engineering, Civil
Mark Loveland, Eirik Valseth, Jessica Meixner, Clint Dawson
Summary: This article discusses the importance of using numerical models to predict the wind wave spectrum of the ocean. The article explores various finite element discretizations of the Wave Action Balance Equation and examines their convergence properties through simplified 2-D test cases. It also introduces a new spectral wind wave model called WAVEx and its implementation method.
COASTAL ENGINEERING
(2024)
Article
Engineering, Civil
Yuan Li, Chi Zhang, Shaohua Zhao, Hongshuai Qi, Feng Cai, Jinhai Zheng
Summary: Sandy-muddy transitional beaches (SMT-Beaches) are a type of coastal formation consisting of upper sandy beach and lower mudflat. This study examined the morphological characteristics of SMT-Beaches and the mechanisms of the formation of sandmud transition (SMT) boundary. Field surveys were conducted on SMT-Beaches in South China Coasts and a new equilibrium profile function for SMT-Beaches was developed. The function demonstrated good performance and improved accuracy compared to traditional methods. It was also found that sediment characteristics differ on both sides of the SMT boundary, with clay-to-silt grains increasing seaward.
COASTAL ENGINEERING
(2024)
Article
Engineering, Civil
He Ma, Ludi Xu, Samuel Ukpong Okon, Peng Hu, Wei Li, Huabin Shi, Zhiguo He
Summary: This study presents a coupled model to predict morphodynamic changes during storm surges. The model accurately simulates the morphological evolution of the Santa Rosa barrier island caused by Hurricane Ivan's storm surge.
COASTAL ENGINEERING
(2024)
Article
Engineering, Civil
Myung Jin Koh, Hyoungsu Park, Albert S. Kim
Summary: A framework combining tsunami flow model and debris transport model is developed to evaluate the kinematics of multiple debris and sequential hazards in a coastal community. The impact of tsunami-driven debris at Honolulu Harbor, Hawaii is assessed by simulating the motion of 2500 shipping containers under a hypothetical tsunami event. New types of intensity measures for tsunami-driven debris hazards are introduced, and hazard maps showing the potential impact loadings from debris dispersion are presented.
COASTAL ENGINEERING
(2024)