Computational Particle Mechanics最新文献

{"title":"CFD-DEM Investigation of the effects of particle size and fluidization regime on heat transfer in fluidized beds","authors":"Mahdi Alipoor,&nbsp;Saman Kazemi,&nbsp;Reza Zarghami,&nbsp;Navid Mostoufi","doi":"10.1007/s40571-025-01018-8","DOIUrl":"10.1007/s40571-025-01018-8","url":null,"abstract":"<div><p>This paper presents an in-depth study of heat transfer in fluidized beds, employing the CFD-DEM technique. The primary focus is to examine the impacts of inlet gas velocity, fluidization regime, and particle size on the thermal behavior of fluidized beds. The results revealed that thermal convection predominantly governs heat transfer in fluidized beds, accounting for the largest fraction of the overall heat transfer process. Particle–fluid–particle thermal conduction was found to contribute approximately 10–20% of the heat transfer, whereas particle–particle conduction exhibits a minor role. Upon increasing the inlet gas velocity, the convection rate intensifies, whereas the particle–fluid–particle conduction rate decreases. Furthermore, the study highlights the differences in temperature distribution between turbulent and bubbling fluidized beds. Turbulent bed demonstrated a more uniform and homogenous particle temperature compared to bubbling. At similar fluidization numbers in bubbling beds, increasing particle diameter enhances thermal convection while reducing particle–fluid–particle conduction. In contrast, the turbulent regime shows minimal differences in heat transfer mechanisms when particle size varies. Additionally, smaller particles are found to significantly improve temperature uniformity in fluidized beds. A comprehensive comparison of simulation results with experimental data validates the accuracy of the employed model, reinforcing its ability to predict heat transfer in fluidized beds reliably. This research provides valuable insights into the complex interplay of various mechanisms of heat transfer within fluidized beds, enabling engineers and researchers to optimize bed performance and enhance temperature control in various industrial applications.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 4","pages":"2037 - 2058"},"PeriodicalIF":2.8,"publicationDate":"2025-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144880838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical study of thermophoretic deposition of particles in a microchannel with multivibrating elastic ribbons","authors":"Ehsan Mehrabi Gohari,&nbsp;Meisam Mohammadi","doi":"10.1007/s40571-025-01016-w","DOIUrl":"10.1007/s40571-025-01016-w","url":null,"abstract":"<div><p>This research numerically investigates the deposition of airborne particles in a microchannel with elastic ribbons under the influence of thermophoretic forces. The finite element method and an arbitrary Lagrangian–Eulerian (ALE) formulation were employed to solve the governing equations for fluid flow, heat transfer, and particle trajectories. Simulations were conducted for various ribbon configurations and particle sizes ranging from 0.1 to 1.0 µm. Results indicate that thermophoretic forces significantly influence particle deposition in this microchannel system. Increasing the temperature difference between the channel walls, particularly by selecting the upper wall as the hot wall, enhances the thermophoretic force and leads to higher deposition rates. The presence and vibration of elastic ribbons further impact particle trajectories, particularly when placed on the upper wall. In this configuration, the combined effect of thermophoretic force and ribbon movement directs particles toward the lower wall, increasing the likelihood of deposition. Additionally, particles with a diameter of 0.1 μm are more susceptible to thermophoretic forces, resulting in higher deposition rates compared to larger particles. This study provides insights into the complex interplay between fluid flow, heat transfer, and particle transport in microchannel systems with elastic ribbons. The findings have potential applications in various fields, including microfluidic devices, air filtration, and thermal management.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 4","pages":"2021 - 2035"},"PeriodicalIF":2.8,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144880707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"GIS-driven multi-phase simulation framework for assessing rainfall-triggered landslides using SPH-FDM techniques","authors":"Avinash Sajwan,&nbsp;Sourabh Mhaski,&nbsp;G. V. Ramana","doi":"10.1007/s40571-025-01015-x","DOIUrl":"10.1007/s40571-025-01015-x","url":null,"abstract":"<div><p>Rainfall-induced landslides are critical geohazards that jeopardise infrastructure and human safety, emphasising the need for precise predictive models to enable effective management and mitigation strategies. This study introduces a GIS-enabled, multi-phase numerical framework that integrates smoothed particle hydrodynamics (SPH) for modelling landslide initiation and the finite difference method (FDM) for analysing post-failure mass flow dynamics. The SPH-based landslide initiation model (LIM) simulates rainfall infiltration and transient seepage effects on slope stability to identify potential failure zones. Subsequently, the FDM-based landslide propagation model (LPM) evaluates the kinematic behaviour of the failed material, providing detailed insights into post-failure mechanics. The framework was validated using benchmark scenarios to confirm its accuracy and robustness. It was then applied to a case study near a hydropower structure, where cumulative rainfall of 282 mm over six days resulted in significant deformation in approximately 7% of the 0.35 km² study area. Depth of failure analysis estimated a release volume of 1.35 <span>(times )</span> 10⁴ m³, with the displaced mass reaching a maximum height of 10.6 m and a peak velocity of 30.1 m/s in narrow gullies. This integrated framework significantly advances the understanding of landslide processes in complex terrains and offers a computationally efficient tool for hazard assessment and infrastructure resilience planning. Future research should prioritise incorporating obstacle–flow interactions within the framework to optimise the design of protective measures and enhance disaster mitigation strategies.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 4","pages":"1999 - 2020"},"PeriodicalIF":2.8,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144880702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modeling concrete cracking induced by non-uniform rebar corrosion using experiments and mesoscale peridynamics","authors":"Wei Sun,&nbsp;Wanchuan Zou,&nbsp;Shicheng Bao,&nbsp;Qiuhao Du,&nbsp;Ran Song","doi":"10.1007/s40571-025-01007-x","DOIUrl":"10.1007/s40571-025-01007-x","url":null,"abstract":"<div><p>With rapid advancements in civil engineering, reinforced concrete (RC) structures are extensively used in large infrastructure projects, such as sea-crossing bridges, port terminals, tunnels, and dams. However, exposure to seawater makes these structures highly susceptible to corrosion, accelerating deterioration and reducing their service life. This study investigates concrete cracking induced by non-uniform rebar corrosion through experimental tests and mesoscale peridynamic (PD) modeling. Two sets of accelerated corrosion tests were conducted, and a novel method for generating the heterogeneous mesoscale bond-based PD model was developed, utilizing meshless discretization directly. The model incorporates a time-dependent, non-uniform corrosion approach with a semi-elliptical distribution to represent the evolution and uneven expansion of corrosion products. The numerical method was validated against experimental data, showing strong agreement. The parametric study reveals that thicker concrete covers delay crack initiation, leads to longer and widely distributed cracks, and increase expansion pressure, while larger rebar diameters result in wider cracks and smaller expansion pressure. The shape of the aggregates has minimal impact on crack propagation. Additionally, the presence of multiple rebars accelerates the cracking process, potentially leading to concrete cover spalling. These findings enhance the understanding of corrosion-induced cracking in RC structures and offer valuable insights for improving structural durability and maintenance strategies.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 4","pages":"1981 - 1998"},"PeriodicalIF":2.8,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144880703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of calendering on double-layer capacitor electrodes using the discrete element method","authors":"Jianfei Tu,&nbsp;Guitao Yu,&nbsp;Zhijun Qiao,&nbsp;Gangming Wang,&nbsp;Guoping Li","doi":"10.1007/s40571-025-01002-2","DOIUrl":"10.1007/s40571-025-01002-2","url":null,"abstract":"<div><p>This article reports the in-depth analysis, software simulation, and experimental validation of the negative effects of roller compaction on the electrodes of double-layer capacitors, including particle detachment and current collector elongation. The main component of the coatings of double-layer capacitors is porous-particle-type activated carbon containing agglomerates. This study analyzed the interactions between activated carbon particles and agglomerates and constructed electrode models comprising particles of various shapes based on the results of the aforementioned analyses. A bonded particle model implemented in the discrete element method simulation software was employed to simulate and analyze the vertical pressing and bidirectional movements of the particles. Additionally, the simulation results were validated through roller compaction experiments on the electrodes of double-layer capacitors. The results of the simulations and experiments indicated that the roller compaction of double-layer-capacitor electrodes improved their performance and lifespan but lead to various issues such as particle detachment, current collector elongation, and electrode-thickness rebound. Roller compaction degree, compaction speed, and particle shape were found to be the major factors affecting the outcome of calendering. A greater degree of compaction resulted in greater particle detachment, and increased irregularity of particle shapes had a considerable negative impact on electrodes, which can be alleviated by appropriately increasing the compaction speed.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 4","pages":"1933 - 1946"},"PeriodicalIF":2.8,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144880699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of shallow coal seam mining on the surface in loess gully region: insights from numerical simulation and discrete physical model experiments","authors":"Wenyong Bai,&nbsp;Yingwei Hu,&nbsp;Qingyun Xu,&nbsp;Yuandong Qiao,&nbsp;Tongda Li,&nbsp;Lijuan Yi,&nbsp;Yongming Li,&nbsp;Shengli Wei,&nbsp;Bowen Xu,&nbsp;Xiaolong Yang,&nbsp;Xiong He","doi":"10.1007/s40571-025-01005-z","DOIUrl":"10.1007/s40571-025-01005-z","url":null,"abstract":"<div><p>The extraction of coal resources can greatly affect surface ecology. This impact is particularly seen in loess gully regions (LGRs), where surface cracks form and expand, threatening land stability and ecological safety. To tackle these concerns, this study combines discrete physical simulation experiments with numerical simulations. It focuses on the 135,201 working face of a typical coal mine in the LGR. A 1:100 discrete physical model is created to simulate surface crack generation and expansion across different mining stages. This model enables the analysis of overburden fissure evolution, surface crack development, and surface movement patterns. The research reveals that the development of surface cracks is jointly influenced by the characteristics of mining—induced overburden pressure and the surface topography. During the second mining stage (the Bottom of the Gully Mining Stage), underground mining has a relatively small impact on the surface. However, in the third stage (the Back of the Gully Mining Stage), the surface is more frequently and severely affected by underground excavation, with the same underground mining distance causing more intense surface disturbance. Numerical simulations are also used to study the failure, stress, and surface movement and deformation of the overlying rock layer in the mining area. Field observations further analyse the initiation, active, and recession stages of surface subsidence in the LGR during coal mining. Calculations of tilt and curvature variations between adjacent measurement points show that surface tilt and curvature changes along the inclination observation line are more regular, with maximum tilt values reaching 61.7 mm/m and 60.8 mm/m. However, variations along the strike observation line are influenced by the complex local topography and geomorphology. Overall, the results offer useful insights for coal mining and surface protection in similar geological settings, especially through the physical model experiments applied in this study.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 4","pages":"1955 - 1979"},"PeriodicalIF":2.8,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144880831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modelling of permeability reduction caused by suspended fine particles migrating in homogeneous sand sediment using lattice Boltzmann method","authors":"Keisuke Mitsuhori,&nbsp;Toru Sato,&nbsp;Jiro Nagao,&nbsp;Norio Tenma","doi":"10.1007/s40571-025-01003-1","DOIUrl":"10.1007/s40571-025-01003-1","url":null,"abstract":"<div><p>The reduction in permeability of sediments due to blockages caused by suspended fine particles is a common concern for the extraction processes of oil, natural gas, or methane gas from methane hydrate. In this study, the permeability reduction caused by suspended fine particles was newly modelled. Solid–water two-phase flow in frame sand sediment was numerically simulated by a three-dimensional Lattice Boltzmann method. For frame sand, shapes of real sand grains were extracted by series expansion of spherical harmonics from CT-scan images and packed in a microscopic computational domain. For each fine particle, a motion equation is solved using the pressure integrated on its surface with considering its collision to the frame sand surfaces. The calculated relative permeability could not be modelled solely by the volume saturation of the fine particles, but also their specific surface area was required.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 4","pages":"1947 - 1954"},"PeriodicalIF":2.8,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40571-025-01003-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144880771","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Progress and prospect of particle finite element method for large deformation simulation in geotechnical engineering","authors":"Wei Zhang,&nbsp;Wenrui Sun,&nbsp;Weihai Yuan,&nbsp;Ming Liu","doi":"10.1007/s40571-025-01000-4","DOIUrl":"10.1007/s40571-025-01000-4","url":null,"abstract":"<div><p>Particle finite element method (PFEM) can effectively simulate large deformation problems in geotechnical disasters such as landslides, debris flows, and dam breaks. In recent years, PFEM has attracted much attention at home and abroad. The research progress of PFEM for large deformation simulation in geotechnical engineering is reviewed. Firstly, the development history and basic idea of the PFEM are introduced. Then, the theoretical progress of the computational theory for PFEM in geotechnical engineering is presented. Finally, the application progress of the PFEM for large deformation simulation in geotechnical engineering is introduced, including collapse and landslide problems, structure–soil coupling large deformation problems, hydromechanical coupled problems, etc. Through the review of the research progress of PFEM for large deformation simulation in geotechnical engineering, the cognition of relevant researchers in this field is deepened, and the development of large deformation simulation theory and engineering application of PFEM for geotechnical engineering is promoted.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 4","pages":"1893 - 1911"},"PeriodicalIF":2.8,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144880973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cumulative gangue mixing ratio prediction model for image-based in situ coal/gangue identification","authors":"Jinwang Zhang,&nbsp;Jialin Zhao,&nbsp;Geng He,&nbsp;Xiaohang Wan,&nbsp;Melih Geniş,&nbsp;Haobo Zhang,&nbsp;Weijie Wei,&nbsp;Lianghui Li,&nbsp;Ahmet Özarslan,&nbsp;Dongliang Cheng,&nbsp;Jingzheng Wang","doi":"10.1007/s40571-025-01001-3","DOIUrl":"10.1007/s40571-025-01001-3","url":null,"abstract":"<div><p>Image-based in situ coal/gangue identification has emerged as a pivotal tool for monitoring instantaneous gangue mixing ratios (IGMR) in fully mechanized top coal caving operations. However, intelligent coal caving control requires dynamic optimization based on the \"top coal recovery rate–cumulative gangue mixing ratio (CGMR)\" curve. This study establishes a predictive framework linking IGMR to CGMR through numerical simulations and machine learning. The authors proposed a particle swarm optimization–random forest (PSO–RF) hybrid model that outperforms conventional RF, achieving <i>R</i>² values of 0.937 (advancing direction) and 0.962 (layout direction). Feature importance analysis reveals scraper speed, coal caving position, and sequential/interval caving strategies as dominant factors influencing CGMR. Physical experiments validate the model's robustness, demonstrating a 56% reduction in prediction error compared to baseline methods.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 4","pages":"1913 - 1932"},"PeriodicalIF":2.8,"publicationDate":"2025-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144880732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"DEM investigations on the effects of confining pressure and particle breakage on the mechanical behavior of tailings","authors":"Xueting Li,&nbsp;Chao Zhang,&nbsp;Qinglin Chen,&nbsp;Changkun Ma,&nbsp;Zhenkai Pan","doi":"10.1007/s40571-025-00933-0","DOIUrl":"10.1007/s40571-025-00933-0","url":null,"abstract":"<div><p>The effects of confining pressure and particle breakage on the mechanical behavior of tailings were investigated using the discrete-element method to simulate conventional triaxial tests. The particle breakage was simulated using the octahedral shear stress breakage criterion and 14 Apollonian fragments replacement method. The macroscopic behavior of tailings revealed that the peak shear stress ratio is sensitive to confining pressure and the critical shear stress ratio is less sensitive to particle breakage. Confining pressure and particle breakage affect shear expansion, leading to changes in shear damage patterns. The quantitative study shows that particle breakage is the main factor influencing the nonlinear variation of the tailing strength. However, the influence proportion of particle breakage is gradually decreasing with the increase in the confining pressure. Microscopic analysis reveals a positive correlation between the overall anisotropy and the shear stress ratio, with the anisotropy of the normal contact force distribution contributing the most. The variation of the overall anisotropy is caused by the variation of the contact state, in which the sliding contact state is the main influencing factor.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 4","pages":"2517 - 2532"},"PeriodicalIF":2.8,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144880877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}