Computational Particle Mechanics最新文献_第8页

A numerical investigation for lithium extraction from the seawater using hydrodynamic and electromagnetic fields effects in multi-S-shaped channel 利用多 S 形通道中的流体动力学和电磁场效应从海水中提取锂的数值研究

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2023-11-04 DOI: 10.1007/s40571-023-00678-8

Bahador Abolpour, Ramtin Hekmatkhah, Hanie Abbaslou

{"title":"A numerical investigation for lithium extraction from the seawater using hydrodynamic and electromagnetic fields effects in multi-S-shaped channel","authors":"Bahador Abolpour, Ramtin Hekmatkhah, Hanie Abbaslou","doi":"10.1007/s40571-023-00678-8","DOIUrl":"10.1007/s40571-023-00678-8","url":null,"abstract":"<div><p>In this study, the separations of the soluble equal concentrations of high concentrate ions in seawaters and lithium ions are investigated, numerically. At the outlet of the S-, SS-, and SSS-shaped channels, the solution is lithium concentrated, by removing other ions. Electromagnetic force is used for this separation procedure. For this simulation, a numerical model of this process has been developed based on the finite volume method, computational fluid dynamics, and Lagrangian trajectories tracking method. For optimization of operational parameters including the electromagnetic field intensity and inlet fluid velocity, the genetic algorithm approach has been used in a homemade code in MATLAB software. It is observed that these channels enter different force directions on these ions and provide a balance between the electric and magnetic forces to control their movement. It is obtained that all of the impurities are removed in an optimum condition of a triple S-shaped electromagnetic channel, except potassium ions, and the percentage of lithium ions is increased from 20% at the inlet to 55% at the outlet, in an acceptable pressure drop of the passing fluid flow.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"11 3","pages":"1149 - 1161"},"PeriodicalIF":2.8,"publicationDate":"2023-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135774174","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

Coupled FEM/DEM modeling for the pull-out failure of corroded rockbolt 针对腐蚀性岩石螺栓拉出失效的有限元/有限元耦合建模

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2023-11-01 DOI: 10.1007/s40571-023-00680-0

Dong Zhihong, Wu Xu, Xi Xun, Li Jun, Peitao Wang, Peng Li, Pan Jiliang

{"title":"Coupled FEM/DEM modeling for the pull-out failure of corroded rockbolt","authors":"Dong Zhihong, Wu Xu, Xi Xun, Li Jun, Peitao Wang, Peng Li, Pan Jiliang","doi":"10.1007/s40571-023-00680-0","DOIUrl":"10.1007/s40571-023-00680-0","url":null,"abstract":"<div><p>Corrosion of rockbolt significantly affects the long-term performance of anchoring structures. The pull-out behavior is a reference of the most practical significance for the design and assessment of rockbolt. Existing research normally uses reduced mechanical parameters to analyze the anchoring performance of corroded rockbolt. This paper presents a novel FEM/DEM coupling numerical method for investigating the pull-out failure of corroded rockbolt. Corrosion products are modeled as a layer of particles, and rock, grouting materials and rockbolt are modeled as bulk. The pull-out experiments of corroded rockbolt are carried out. The pull-out stress–displacement curves from experiments are employed for the calibration of rust parameters. Further, unified parameters of rust particles are used to model the effects of corrosion and confining pressure on the pull-out failure of rockbolt. It has been found that, as the corrosion development, the thickness of the corrosion layer grows thicker, which causes the degradation of bond strength and critical displacement. When corrosion degree increases from 0.62 to 4.83%, the bond strength and critical displacement decrease by 68.6% and 80%, respectively. Moreover, the larger the confining pressure is, the effect of corrosion on the strength reduction is more significant. This study provides a simple and feasible way to model the pull-out failure of corroded rockbolt.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"11 4","pages":"1599 - 1611"},"PeriodicalIF":2.8,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135271734","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

Discrete element model for cracking in defective ceramics under uniaxial compression 单轴压缩下缺陷陶瓷开裂的离散元模型

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2023-10-30 DOI: 10.1007/s40571-023-00672-0

Yafeng Li, Lei Wang, Hongfei Gao, Jing Zhang

引用次数: 0

Comparison of sub-grid drag laws for modeling fluidized beds with the coarse grain DEM–CFD approach 流化床建模的子网格阻力定律与粗粒 DEM-CFD 方法的比较

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2023-10-27 DOI: 10.1007/s40571-023-00671-1

Janna Grabowski, Nico Jurtz, Viktor Brandt, Harald Kruggel-Emden, Matthias Kraume

{"title":"Comparison of sub-grid drag laws for modeling fluidized beds with the coarse grain DEM–CFD approach","authors":"Janna Grabowski, Nico Jurtz, Viktor Brandt, Harald Kruggel-Emden, Matthias Kraume","doi":"10.1007/s40571-023-00671-1","DOIUrl":"10.1007/s40571-023-00671-1","url":null,"abstract":"<div><p>Fluidized particulate systems can be well described by coupling the discrete element method (DEM) with computational fluid dynamics (CFD). However, the simulations are computationally very demanding. The computational demand is drastically reduced by applying the coarse grain (CG) approach, where several particles are summarized into larger grains. Scaling rules are applied to the dominant forces to obtain precise solutions. However, with growing grain size, an adequate representation of the interaction forces and, thus, representation of sub-grid effects such as bubble and cluster formation in the fluidized particulate system becomes challenging. As a result, particle drag can be overestimated, leading to an increase in average particle height. In this work, limitations of the system-to-grain ratio are identified but also a dependency on system width. To address this issue, sub-grid drag models are often applied to increase the accuracy of simulations. Nonetheless, the sub-grid models tend to have an ad hoc fitting, and thorough testing of the system configurations is often missing. Here, five different sub-grid drag models are compared and tested on fluidized bed systems with different Geldart group particles, fluidization velocity, and system-to-grain diameter ratios.\u0000</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"11 3","pages":"1035 - 1054"},"PeriodicalIF":2.8,"publicationDate":"2023-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40571-023-00671-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136262279","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

Microscopic mechanical analysis of K0 of granular soils with particle size distribution and rolling resistance effects 具有粒度分布和滚动阻力效应的粒状土 K0 的微观力学分析

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2023-10-25 DOI: 10.1007/s40571-023-00669-9

Tao Zhang, Sui Wang, Shuyang Yu, Zhaohua Sun, Chuanfeng Fang, Shuren Wang

{"title":"Microscopic mechanical analysis of K0 of granular soils with particle size distribution and rolling resistance effects","authors":"Tao Zhang, Sui Wang, Shuyang Yu, Zhaohua Sun, Chuanfeng Fang, Shuren Wang","doi":"10.1007/s40571-023-00669-9","DOIUrl":"10.1007/s40571-023-00669-9","url":null,"abstract":"<div><p>The coefficient of lateral earth pressure at rest, <i>K</i><sub>0</sub>, is an essential parameter for analyzing earth pressure distribution and the safe reliability of structures in geotechnical engineering. This paper presents a series of numerical one-dimensional compression tests on granular soils with particle size distribution (PSD) and rolling resistance (RR) effects using a real-particle 3D discrete element model. The corresponding macro–micro behaviors are investigated in a parallel way. Both PSD and RR affect <i>K</i><sub>0</sub> and the related compression characteristics. A higher coefficient of uniformity (<i>C</i><sub><i>u</i></sub>) or rolling resistance coefficient (<i>μ</i><sub><i>r</i></sub>) results in a monotonic decrease in the mean coordination number, and too much consideration of RR makes the mean coordination number less realistic in a particle system. The influence of PSD is more sensitive to the local-ordering structure and contact force network than the RR. The inhomogeneity of normal contact forces enhances as <i>C</i><sub><i>u</i></sub> increases and slightly reduces as <i>μ</i><sub><i>r</i></sub> increases. The strong contacts are much more anisotropic than the weak ones. Specimen with lower <i>C</i><sub><i>u</i></sub> or higher <i>μ</i><sub><i>r</i></sub> induces higher anisotropy and more strong contacts during compression, in which a lower <i>K</i><sub>0</sub> is measured. A unique macro–micro relationship exists between <i>K</i><sub>0</sub> and deviatoric fabric when strong contacts are considered only.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"11 3","pages":"1007 - 1020"},"PeriodicalIF":2.8,"publicationDate":"2023-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134973903","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

Study on macro–micro mechanical behavior of rock like samples with hole and cracks 带有孔洞和裂缝的类岩石样品的宏观-微观力学行为研究

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2023-10-23 DOI: 10.1007/s40571-023-00674-y

Dongmei Huang, Shuyu Qiao, Xikun Chang, Xinzhao Wang, Huanhuan Lu, Xin Pan

{"title":"Study on macro–micro mechanical behavior of rock like samples with hole and cracks","authors":"Dongmei Huang, Shuyu Qiao, Xikun Chang, Xinzhao Wang, Huanhuan Lu, Xin Pan","doi":"10.1007/s40571-023-00674-y","DOIUrl":"10.1007/s40571-023-00674-y","url":null,"abstract":"<div><p>There are many holes and cracks in the rock, which significantly affect the strength of the rock mass. In this paper, the influence of holes and crack spacing on the uniaxial compressive strength and failure mode of rock samples with holes and cracks is studied. Through uniaxial compression testing, the macroscopic mechanical behavior of rock-like samples is summarized. Based on the experimental results, the microscopic parameters of the numerical model established in PFC<sup>3D</sup> are calibrated. Then, the uniaxial loading process is simulated to verify the numerical model. According to the simulation results, the influence of holes and crack spacing on the micro-failure mechanism of rock-like samples is analyzed from the perspective of mechanical properties, particle displacement, and failure mode. The results show that the uniaxial compressive strength and elastic modulus of the sample with holes are lower than those of the intact sample, but higher than those of the sample with single hole and double cracks. As the spacing between cracks increases, the peak strength and elastic modulus of the sample show a trend of first increasing and then decreasing. The maximum displacement of particles and the number of microcracks both show a trend of first increasing and then decreasing. During the loading process, there is a phenomenon of stress concentration on both sides of the hole and the crack tip, which can generate a large number of microcracks. Acoustic emission events can be divided into three stages: silent emission stage, stable stage, and rapid growth stage. The damage evolution process of the specimen can be divided into three stages: no damage stage, stable damage growth stage, and damage failure stage.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"11 4","pages":"1579 - 1598"},"PeriodicalIF":2.8,"publicationDate":"2023-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135411517","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

Research on dynamic characteristics of granular flow based on the material point method 基于材料点法的粒状流动态特性研究

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2023-10-21 DOI: 10.1007/s40571-023-00670-2

Yunyun Fan, Fuxuan Wang, Fang Zhang

{"title":"Research on dynamic characteristics of granular flow based on the material point method","authors":"Yunyun Fan, Fuxuan Wang, Fang Zhang","doi":"10.1007/s40571-023-00670-2","DOIUrl":"10.1007/s40571-023-00670-2","url":null,"abstract":"<div><p>The dynamic characteristics of granular flow is very important to improve the understanding of disaster development. The material point method was used to study the dynamic characteristics of granular flow, and the analytical and experimental examples were used to verify the correctness of the numerical simulation. Numerical result shows that the material point method has high accuracy and resolution when simulating the dam-break problem with discontinuous characteristic. The numerical information provided can be used to study the dynamic characteristics of the granular flow, but the numerical information is not easy to be measured by experiment. The numerical result shows that with the change of Froude number, the granular flow mainly goes through several stages: initial start-up, accelerated development, full development and deceleration deposition. The velocity profile changes from the power function distribution in the initial start-up stage to the linear distribution in the accelerated development stage, and forms a more uniform velocity profile in the full development stage. In the deceleration deposition stage, the velocity approaches zero to complete the final deposition. In different development stages, the lateral pressure coefficient of the section is associated with the motion state, but the lateral pressure coefficient is between the limit active state and the limit passive state obtained by the Savage and Hutter theory (SH theory). Unlike SH theory, which assumes that the lateral pressure coefficient can only be selected from two limit values, the lateral pressure coefficient should be continuously changed, which is reflected in the material point method. For large granular flow moving at high speed, the traditional depth-integrated model is effective because the main motion is in the full development stage. However, for complex granular flow processes, the material point method has wider applicability with fewer assumptions.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"11 3","pages":"1021 - 1034"},"PeriodicalIF":2.8,"publicationDate":"2023-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135511580","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

Saturation ratio influence on perforation and penetration of concrete subjected to missile impact: a DEM approach 饱和比对遭受导弹冲击的混凝土穿孔和渗透的影响：DEM 方法

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2023-10-17 DOI: 10.1007/s40571-023-00654-2

Abdallah Accary, Hicham Benniou, Yann Malecot, Matthieu Briffaut, Laurent Daudeville

引用次数: 0

Surface tension simulations with corrected ALE-ISPH and density-based shifting technique 利用校正 ALE-ISPH 和基于密度的移动技术进行表面张力模拟

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2023-10-14 DOI: 10.1007/s40571-023-00666-y

Daniel Shigueo Morikawa, Mitsuteru Asai

{"title":"Surface tension simulations with corrected ALE-ISPH and density-based shifting technique","authors":"Daniel Shigueo Morikawa, Mitsuteru Asai","doi":"10.1007/s40571-023-00666-y","DOIUrl":"10.1007/s40571-023-00666-y","url":null,"abstract":"<div><p>This work shows the extension of a corrected Arbitrary Lagrangian Eulerian Incompressible Smoothed Particle Hydrodynamics (ALE-ISPH) method to surface tension simulations. In this context, the term “corrected” refers to the fact that all derivative operators are modified to enable first-order accuracy. Moreover, particles move according to a transport velocity, which is the summation of the material velocity and a small shifting of particle location to promote a smooth particle distribution at every step; hence, it is based on an ALE formulation. Using this method as a basis, we propose some small empirical modifications to the conventional curvature-based calculation of surface tension forces to simulate this phenomenon. Furthermore, we propose a special wall boundary treatment including ghost particles to reproduce the desired contact angles. Validation and verification tests include the obtaining of the theoretical Laplace pressure in a water droplet, the analysis of the frequency of an oscillating 3D droplet, the comparison of the capillary rise with the theoretical value and the collision of water droplets compared to physical experiments. All numerical simulations were successful, so we consider this to be a reasonable method to simulate the phenomena of surface tension under a wide range of conditions.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"11 3","pages":"965 - 976"},"PeriodicalIF":2.8,"publicationDate":"2023-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135803569","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

Experimental and DEM analysis of granite multi-angle centrally single-cracked Brazilian disks (CSCBD) fracture behaviors 花岗岩多角度集中单裂巴西盘（CSCBD）断裂行为的实验和 DEM 分析

IF 2.8 3区工程技术

Computational Particle Mechanics Pub Date : 2023-10-10 DOI: 10.1007/s40571-023-00665-z

Yunhe Ao, Baoxin Jia, Chuang Sun, Dongxu Chen

{"title":"Experimental and DEM analysis of granite multi-angle centrally single-cracked Brazilian disks (CSCBD) fracture behaviors","authors":"Yunhe Ao, Baoxin Jia, Chuang Sun, Dongxu Chen","doi":"10.1007/s40571-023-00665-z","DOIUrl":"10.1007/s40571-023-00665-z","url":null,"abstract":"<div><p>Brazilian splitting tests were performed on granite disk samples (<i>ϕ</i>50 mm × 25 mm) with five-angle (0°, 20°, 40°, 60°, and 90°) cracked fissures to study the fracture characteristics of granite multi-angle centrally single-cracked Brazilian disks (CSCBD). The loading rate in the laboratory test and the numerical simulation were both 0.10 mm/min. The stress–strain response, crack extension, and distribution were obtained. The change patterns of peak strength, peak strain, and elastic modulus and the correlation of acoustic emission characteristics with the fracture mode were analyzed. An efficient three-dimensional clump (3D-Clump) numerical model construction method for pre-cracked granite in three-dimensional particle flow code (PFC3D) based on the discrete element method (DEM) was used to construct five-angle centrally cracked granite Brazilian disk samples. The failure pattern of samples and the evolution characteristics of interparticle parallel bond force in the numerical simulation were explored. Results indicate that the single crack surface significantly affects the damage strength of the disk samples, and the strength of the samples has a prominent difference with different angles of the single crack. When the angle is 0°, 20°, 40°, and 60°, the cracking point of the sample deviates from the endpoint of the precast fissure. When the sample undergoes a significant brittle fracture, the acoustic emission count curves mainly show the characteristics of peak distribution. The failure modes in computational experiments are similar to those in the laboratory experiments. The samples show mainly tensile damage, with more red tensile cracks than green shear cracks. With the increasing damage, the parallel bond force between the particles reaches the loading limit, breaking the bond. At this time, the local damage of the sample gets its limit, forming macroscopic cracks.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"11 3","pages":"951 - 963"},"PeriodicalIF":2.8,"publicationDate":"2023-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136294766","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