Computational Particle Mechanics最新文献_第2页

Validation and calibration of soil parameters based on EEPA contact model 基于EEPA接触模型的土壤参数验证与标定

IF 3.3 3区工程技术

Computational Particle Mechanics Pub Date : 2023-02-24 DOI: 10.1007/s40571-023-00559-0

Long Zhou, Yubin Lan, Jianqun Yu, Yang Wang, Dongxu Yan, Kai Sun, Wenjun Wang, Yulong Chen

{"title":"Validation and calibration of soil parameters based on EEPA contact model","authors":"Long Zhou, Yubin Lan, Jianqun Yu, Yang Wang, Dongxu Yan, Kai Sun, Wenjun Wang, Yulong Chen","doi":"10.1007/s40571-023-00559-0","DOIUrl":"10.1007/s40571-023-00559-0","url":null,"abstract":"<div><p>The determination of parameters is a key issue in discrete element simulation and controls the accuracy and reliability of the simulation results. In this paper, a sandy loam soil with three water contents is studied and soil particles based on the EEPA model are modelled in three shapes (spheres, columns and Triangular pyramid) to accurately represent the actual soil particle. The sensitivity of the input parameters in the EEPA model is investigated by the Plackett–Burman test. The results show that the coefficient of static friction, coefficient of rolling friction and surface energy between soil particles have a highly significant effect on the angle of repose, and the coefficient of restitution has a significant effect on the angle of repose. The sensitivity parameters are calibrated by the central combination test, and the optimal combination of parameters is obtained. The accuracy of the parameters calibrated is validated by comparing the simulation results of the direct shear test with the actual test results. Therefore, the parameters calibrated satisfy both the flow and mechanical properties of the particles.\u0000</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"10 5","pages":"1295 - 1307"},"PeriodicalIF":3.3,"publicationDate":"2023-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4927357","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}

引用次数: 2

Influence of loose gangue thickness on top coal recovery ratio in extrathick coal seam in longwall top coal caving 长壁放顶煤特厚煤层松散矸石厚度对顶煤回收率的影响

IF 3.3 3区工程技术

Computational Particle Mechanics Pub Date : 2023-02-23 DOI: 10.1007/s40571-023-00567-0

Liu Yang, Jiachen Wang, Shengli Yang, Tao Li, WeiJie Wei, Zheng Li, Fei Liu

{"title":"Influence of loose gangue thickness on top coal recovery ratio in extrathick coal seam in longwall top coal caving","authors":"Liu Yang, Jiachen Wang, Shengli Yang, Tao Li, WeiJie Wei, Zheng Li, Fei Liu","doi":"10.1007/s40571-023-00567-0","DOIUrl":"10.1007/s40571-023-00567-0","url":null,"abstract":"<div><p>This paper uses PFC<sup>2D</sup> software to carry out DEM numerical simulations of coal caving, calculates the top coal recovery under the same coal seam thickness and different rock layer thicknesses, analyzes the influence of the rock layer thickness on the top coal caving law in two different stages, and explains the necessity of a thick rock layer and the optimal thickness of the rock layer. The results show that as the thickness of the loose gangue layer increases from 1 to 8?m, the recovery ratio of top coal increases from 84 to 96%, showing zigzag growth. The lateral diameter of the drawing body gradually increases. Due to the particularity of the coal caving method, in the subsequent coal caving stage, the uneven thickness of the top rock layer causes the direction of the drawing body to change, and the existence of a coal ridge causes the displacement field on the right side of the rock to be larger than that on the left side above the drawing opening. This leads to different sizes of the left and right secondary coal ridges. Through simple geometric relationship analysis, this paper explains the principle that gangue particles intrude into coal seams due to the weakening of rock constraints and an increase in the free movement of coal particles. This further demonstrates the necessity of a loose and thick rock layer. The optimum thickness of the rock layer and the relationship between the thickness of coal and rock and parameters of coal caving are calculated. Finally, the necessity of a thick rock layer is extended to three typical top coal caving methods to verify the universality of this necessity.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"10 5","pages":"1281 - 1294"},"PeriodicalIF":3.3,"publicationDate":"2023-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40571-023-00567-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4893024","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}

引用次数: 2

Diffusion of dual diffusive chemically reactive Casson nanofluid under Darcy–Forchheimer porosity and Robin conditions from a vertical convective surface: a comparative analysis using HAM and collocation procedures 达西-福克海默孔隙率和罗宾条件下双重扩散化学反应卡松纳米流体从垂直对流表面的扩散：使用 HAM 和配位程序的比较分析

IF 3.3 3区工程技术

Computational Particle Mechanics Pub Date : 2023-02-18 DOI: 10.1007/s40571-022-00547-w

Muhammad Nasir, Muhammad Waqas, Nurnadiah Zamri, Nidhal Ben Khedher, Kamel Guedri

{"title":"Diffusion of dual diffusive chemically reactive Casson nanofluid under Darcy–Forchheimer porosity and Robin conditions from a vertical convective surface: a comparative analysis using HAM and collocation procedures","authors":"Muhammad Nasir, Muhammad Waqas, Nurnadiah Zamri, Nidhal Ben Khedher, Kamel Guedri","doi":"10.1007/s40571-022-00547-w","DOIUrl":"10.1007/s40571-022-00547-w","url":null,"abstract":"<div><p>This investigation reports Casson liquid stretching flow persuaded by convectively heated permeable surface. Porous medium effects under Darcy–Forchheimer relation are scrutinized. Nonlinear version of thermo-solutal buoyant forces (i.e., nonlinear mixed convection) is introduced. Nanoliquid model features thermophoresis and Brownian diffusions. Characteristics of heat transfer are elaborated considering heat absorption, thermal radiation, Robin conditions and heat generation. Mass transfer effects are addressed considering chemical reaction. Similarity approach assists to simplify governing expressions (partial differential equations) into the ordinary ones, and these ordinary differential expressions are tackled analytically (via homotopy analysis scheme) and numerically (via bvp4c scheme). The obtained results via homotopy and bvp4c methods are also validated. Besides, the consequence of multiple emerging parameters on dimensionless profiles is investigated via graphs and tables. It is scrutinized that velocity is strongly enhanced with increasing nonlinear mixed convection parameter while it diminishes with increasing Casson fluid parameter, inertia coefficient parameter and porosity parameter.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"10 5","pages":"1267 - 1279"},"PeriodicalIF":3.3,"publicationDate":"2023-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40571-022-00547-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4717125","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}

引用次数: 7

Numerical study on failure mechanism and acoustic emission characteristics of granite after thermal treatment 花岗岩热处理后破坏机制及声发射特性数值研究

IF 3.3 3区工程技术

Computational Particle Mechanics Pub Date : 2023-02-16 DOI: 10.1007/s40571-023-00556-3

Yike Dang, Zheng Yang, Xiaoyu Liu, Chunting Lu

{"title":"Numerical study on failure mechanism and acoustic emission characteristics of granite after thermal treatment","authors":"Yike Dang, Zheng Yang, Xiaoyu Liu, Chunting Lu","doi":"10.1007/s40571-023-00556-3","DOIUrl":"10.1007/s40571-023-00556-3","url":null,"abstract":"<div><p>To investigate the strength characteristics and failure mechanism of granite after thermal treatment are critical for geothermal energy storage and development. Acoustic emission (AE) is widely used to deduce the process of rock crack generation, development and penetration in laboratory tests, thus revealing the mechanism of rock failure. However, previous investigations have shown that laboratory tests cannot directly observe the interaction of thermal cracks and thermal stress, and more than 90<span>(%)</span> of AE tensile failure sources cannot be captured. This paper investigates the generation mechanism of thermal cracks and thermal stress distribution in thermally treated specimens using the discrete element method. After that, the evolution of AE failure sources is quantitatively analyzed by the moment tensor inversion results. The results showed that: (1) Thermal cracks destroy the internal structure of the specimen, thus weakening its mechanical properties. The number of thermal cracks increases with the temperature, further aggravating the damage to the mechanical properties of specimens; (2) as the temperature increases, the failure mode of the specimen changes from splitting failure to shear failure. Moment tensor inversion revealed that tensile failure dominated the final damage of samples. The shear and compaction failure sources increase with temperature, while tensile failure sources decrease; (3) the <i>b</i> value increased by 215<span>(%)</span> from 25 <span>(^{circ })</span>C to 1000 <span>(^{circ })</span>C. As the number of microcracks in a single AE event increases, the AE frequency decays exponentially, and most AE events have 1–5 microcracks.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"10 5","pages":"1245 - 1266"},"PeriodicalIF":3.3,"publicationDate":"2023-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4642033","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}

引用次数: 3

Interaction of wet dam-break flows with a structure: on the effects of surface tension and gate opening velocity in water surface evolution using MPS method 湿溃坝水流与构筑物的相互作用:表面张力和开闸速度对水面演化的影响

IF 3.3 3区工程技术

Computational Particle Mechanics Pub Date : 2023-02-14 DOI: 10.1007/s40571-023-00561-6

Joel Sanchez-Mondragon, Jassiel V. H. Fontes, Marco Polo Espinoza-Haro, Paulo T. T. Esperança

{"title":"Interaction of wet dam-break flows with a structure: on the effects of surface tension and gate opening velocity in water surface evolution using MPS method","authors":"Joel Sanchez-Mondragon, Jassiel V. H. Fontes, Marco Polo Espinoza-Haro, Paulo T. T. Esperança","doi":"10.1007/s40571-023-00561-6","DOIUrl":"10.1007/s40571-023-00561-6","url":null,"abstract":"<div><p>This paper presents an experimental and numerical investigation of the interaction of wet dam-break flows with a fixed structure. These flows presented breaking features and caused bow run-up and shipping water events on the deck of the structure. Wet dam-break experiments were performed using high-speed video to capture the stages of wave generation, interaction with the structure and propagation on its deck. Two different incoming flows were generated, varying the freeboard, and keeping the same wet dam-break ratio. These were numerically simulated using Moving Particle Semi-implicit (MPS) method. The purpose was to compare MPS numerical simulations based on two surface tension models previously proposed in the literature and a geometric-based surface tension model proposed in this work, this to improve free surface performance to represent breaking wave features more realistically. First, the different approaches were compared with experimental results. Then, the proposed model was implemented to analyze the effect of the velocity applied to gate opening on the water surface during wave generation, wave-bow interaction and water propagation over the deck. The distribution of particles, pressure and velocity fields was presented in this analysis. Results showed that the proposed surface tension model performed well in representing the free surface. It was seen that surface tension effects can be relevant during the wave formation effects. Furthermore, it was verified that variating the gate opening velocity, dynamic interactions of the resulting waves with the structure was affected, causing energetic processes variations. It is recommended to consider this velocity for validation purposes.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"10 5","pages":"1221 - 1244"},"PeriodicalIF":3.3,"publicationDate":"2023-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4571430","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}

引用次数: 0

Dynamic stability model and analysis of mechanical properties for railway operations 铁路运行动力稳定性模型及力学性能分析

IF 3.3 3区工程技术

Computational Particle Mechanics Pub Date : 2023-02-11 DOI: 10.1007/s40571-023-00560-7

Xiao Hong, Wang Xiaoyu, Zhang zhihai, Mahantesh M. Nadakatti, Jin Jiaqi, Chi Yihao

{"title":"Dynamic stability model and analysis of mechanical properties for railway operations","authors":"Xiao Hong, Wang Xiaoyu, Zhang zhihai, Mahantesh M. Nadakatti, Jin Jiaqi, Chi Yihao","doi":"10.1007/s40571-023-00560-7","DOIUrl":"10.1007/s40571-023-00560-7","url":null,"abstract":"<div><p>Dynamic track stabilizers have been widely used in the maintenance of ballast track, but limited studies have been carried out for the theoretical analysis of track stabilizing operations. In the present study, the structure of ballast track is innovatively established using bi-directional coupling modeling method which include discrete element method and multi-body dynamics method. The model is verified by field experimental data. Based on the tamping operation model, the mechanical properties of the ballast bed after tamping are obtained. Later simulation analysis of stabilizing operation is carried out to explore the change rule of sleeper displacement, particle contact, compaction, resistance and support stiffness of ballast bed. The results show that stabilizing operation can force the sleeper of the new railway line to move down quickly by 5.56 mm. The most significant improvement to the average coordination number between ballast was in the top layer of the crib area, which increased by 19.3%. The most significant area for improving the compactness of the ballast bed is the uppermost layer at the bottom of a sleeper, with an improvement rate of 6.4%. After stabilizing operation, the longitudinal and lateral resistances and supporting stiffness of the ballast track increased by 45.1%, 37.9% and 172.0%, respectively.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"10 5","pages":"1205 - 1219"},"PeriodicalIF":3.3,"publicationDate":"2023-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4455319","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}

引用次数: 3

A unified and modular coupling of particle methods with fem for civil engineering problems 土木工程问题中粒子法与有限元的统一模块化耦合

IF 3.3 3区工程技术

Computational Particle Mechanics Pub Date : 2023-02-06 DOI: 10.1007/s40571-023-00558-1

Carlos Eulogio Flores, Klaus Bernd Sautter, Philipp Bucher, Alejandro Cornejo, Alessandro Franci, Kai-Uwe Bletzinger, Roland Wüchner

{"title":"A unified and modular coupling of particle methods with fem for civil engineering problems","authors":"Carlos Eulogio Flores, Klaus Bernd Sautter, Philipp Bucher, Alejandro Cornejo, Alessandro Franci, Kai-Uwe Bletzinger, Roland Wüchner","doi":"10.1007/s40571-023-00558-1","DOIUrl":"10.1007/s40571-023-00558-1","url":null,"abstract":"<div><p>In this work, a modular coupling approach for particle methods with the FEM (finite element method) is presented. The proposed coupled strategy takes advantage from the ability of particle methods of dealing with large displacements and deformations, especially when solving complex fluid–structure and solid–structure interaction problems. The coupling between the FEM and particle methods is done using a co-simulation approach implemented in the open-source Kratos Multiphysics framework. The particle methods considered in this work are the DEM (discrete element method) and the PFEM (particle finite element method). The Lagrangian description of the PFEM is well suited for modeling fluids undergoing large deformations and free-surface motions, and the DEM can be used to simulate rocks, debris and other solid objects. To accelerate the convergence of the coupled strategy, a block Gauss–Seidel algorithm with Aitken relaxation is used. Several numerical examples, with an emphasis on natural hazards, are presented to test and validate the proposed coupled method.\u0000</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"10 5","pages":"1181 - 1203"},"PeriodicalIF":3.3,"publicationDate":"2023-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40571-023-00558-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4248687","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}

引用次数: 0

Movement of C100 fullerene in a closed carbon nanocontainer C100富勒烯在封闭碳纳米容器中的运动

IF 3.3 3区工程技术

Computational Particle Mechanics Pub Date : 2023-01-27 DOI: 10.1007/s40571-023-00552-7

Vladislav I. Borodin, Alexey M. Bubenchikov, Mikhail A. Bubenchikov, Anna S. Chelnokova, Dmitriy V. Mamontov

引用次数: 1

Simulation of dense gas-particle flow using a USM-θ model, combined with a frictional stress model 结合摩擦应力模型的USM-θ模型模拟致密气粒流

IF 3.3 3区工程技术

Computational Particle Mechanics Pub Date : 2023-01-27 DOI: 10.1007/s40571-023-00554-5

Lixing Zhou, Yang Liu

引用次数: 0

Variation characteristics analysis of sandstone strength parameters in discrete element method by using internal scale ratio 采用内标度比的离散元法分析砂岩强度参数变化特征

IF 3.3 3区工程技术

Computational Particle Mechanics Pub Date : 2023-01-20 DOI: 10.1007/s40571-022-00551-0

Yao Zhang, Shaoqiang Guo, Xiaotao Yin

{"title":"Variation characteristics analysis of sandstone strength parameters in discrete element method by using internal scale ratio","authors":"Yao Zhang, Shaoqiang Guo, Xiaotao Yin","doi":"10.1007/s40571-022-00551-0","DOIUrl":"10.1007/s40571-022-00551-0","url":null,"abstract":"<div><p>The mesostructural characteristics of sandstone determine its macro-engineering characteristics. To better understand the relationship between cohesion of sandstone particles and strength in the present study, the FISH programming language was used to design a particle flow test program and conduct uniaxial compression tests of geomaterials. Twelve numerical specimens with diameters of 0.05, 0.1, 0.2, 0.4, 0.6, 0.8, 1.0, 1.2, 1.4, 1.6, 1.8, and 2.0?mm were designed for uniaxial compression tests. A total of 41 tests were carried out to simulate three bond strengths between particles with no friction and 19 internal friction angles from 0° to 90° under weak and strong bonding conditions. According to the failure modes and stress–strain curves of the specimens, the influence of the inner scale ratio on the particle flow was analyzed. The following particular phenomena were observed: (1) With the increase in the bond strength between particles, it was more difficult for the particles to rupture, and the number of micro-cracks was drastically reduced. (2) When the bond strength remained constant, the failure modes before and after the internal friction angle of 45° were completely different, which was related to the shear failure angle. (3) The curve dropped significantly after the strong bonding peak, and the brittle failure characteristics were evident. (4) The changes in the strength parameters between particles did not change the energy transfer mode, and the change of the bond strength increased the proportion of the strain energy in the input energy. (5) In the case of weak bonding, the proportion of the strain energy in the input energy gradually decreased with the increase in the internal friction angle. When the bond was strong, the proportion of the strain energy was stable, with an insignificant decrease as the internal friction angle increased.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"10 5","pages":"1145 - 1160"},"PeriodicalIF":3.3,"publicationDate":"2023-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40571-022-00551-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4793094","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}

引用次数: 0