Computational Particle Mechanics最新文献

{"title":"An explicit incompressible scheme based on the MPS method to simulate slump flow","authors":"Tibing Xu,&nbsp;Seiichi Koshizuka,&nbsp;Yohei Inaba,&nbsp;Yuichiro Gakuhari","doi":"10.1007/s40571-024-00848-2","DOIUrl":"10.1007/s40571-024-00848-2","url":null,"abstract":"<div><p>In this study, an explicit incompressible scheme based on the Moving Particle Semi-implicit method (MPS) is applied to simulate slump flow. In the numerical method, the pressure Poisson equation is explicitly solved to obtain the pressure field. In simulating slump flow caused by fresh concrete, the fluid is treated to be non-Newtonian fluid and a regularized Bingham model is employed to calculate the viscosity. Flow characteristics in the slump flow are reproduced by the numerical method, and in good agreement with experimental measurements. The parameters including the rheological regularized parameter, yield stress, plastic viscosity, and particle distance, are examined in the simulations. It is found that the explicit incompressible scheme can well reproduce the concrete spreading. The yield stress in the rheology model affects the spreading distance significantly while the plastic viscosity plays an important role in the acceleration stage of the material spreading.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 2","pages":"971 - 985"},"PeriodicalIF":2.8,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40571-024-00848-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143918970","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":"Study of penetration performance of embowed linear-shaped charge based on SPH method","authors":"Shenhe Zhang,&nbsp;Zhifan Zhang,&nbsp;Longkan Wang,&nbsp;Zhi Zong,&nbsp;Guiyong Zhang","doi":"10.1007/s40571-024-00849-1","DOIUrl":"10.1007/s40571-024-00849-1","url":null,"abstract":"<div><p>Linear-shaped charges (LSCs) are widely used to incise or demolish target structures in civilian and defense industries. In such tasks as removing submarine pipelines, or cutting thin-walled structures in offshore platforms, causing a long penetration hole is considered as the primary objective for LSCs. For the improvement of the penetration performance of LSCs, especially increasing the penetration length, a novel linear-shaped charge called embowed linear-shaped charge (ELSC) is proposed in this paper. Based on smoothed particle hydrodynamics (SPH) method, numerical models of the ELSC and the LSC with equal charge are established. Then, the results of jet formation and penetration performance of the ELSC and the LSC are compared and analyzed. It is found that the longitudinal length of the jet of the ELSC before penetration is 36.4% larger than that of the LSC. Besides, the length and the width of the hole penetrated by the ELSC are 20.4% and 26.6% larger than those of the LSC.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 3","pages":"1421 - 1432"},"PeriodicalIF":2.8,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145167266","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":"The reflection in CFD calculations of influence of mass loading on the separation efficiency in a centrifugal separator","authors":"Arkadiusz Kępa","doi":"10.1007/s40571-024-00841-9","DOIUrl":"10.1007/s40571-024-00841-9","url":null,"abstract":"<div><p>The multiphase flows modelling, including computational fluid dynamics (CFD), is extremely difficult due to the complexity of the phenomena and the influence of a large number of factors. The main purpose of this work is to show how the available models can help to reproduce a simple two-phase flow. In the presented work, using one of the commercial CFD programs, a new flat centrifugal separator design was investigated. The separator consists of a circle with a diameter of 0.2 m and two tangential channels (inlet and outlet). An outlet channel was divided into two separate ones additionally. Simulations were carried out for solid mass flow rate from 0.001 to 0.5 kg/s and for two particle sizes—1 and 30 µm. The performed calculations showed that two-way coupling can correctly reflect the improvement of the particle separation efficiency with the increase in the mass loading. The calculated total separation efficiency increased by approximately four percentage points and resulted from better retention of finer particles.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 1","pages":"793 - 806"},"PeriodicalIF":2.8,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143554111","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":"Calibration of corn kernel simulation parameters during harvest and evaluation of its adaptability","authors":"Dan-Dan Han,&nbsp;Chao Tang,&nbsp;Wei Li,&nbsp;Li-Jia Xu,&nbsp;Lin Chen","doi":"10.1007/s40571-024-00853-5","DOIUrl":"10.1007/s40571-024-00853-5","url":null,"abstract":"<div><p>To gain the corn kernel’s bonded particle model and the optimal bonding parameters during harvest for later constructing the discrete meta-model of the integral corn ear, that may be applied for threshing simulation and analysis. Taking the ventral and lateral compressive destructive forces of the large flat kernel as evaluation indexes, the constructed large flat kernel bonded particle model was put through simulated compression tests by introducing the Plackett–Burman and steepest ascent tests to screen out the factors and their centroids with significant effects on the bonding force of corn kernels. The Box-Behnken response surface test was conducted to identify the optimal relevance factor values. The results revealed that the effect of bonded disk radius (<i>R</i>_B) on the large flat kernel’s ventral compressive destructive force was extremely significant, and that of shear stiffness per unit area (<i>k</i>_s) was generally significant. Each saliency variable had an impact on the large flat kernel’s lateral compressive destructive force, in descending order: <i>R</i>_B, <i>k</i>_s, normal stiffness per unit area (<i>k</i>_n), and shear modulus (<i>G</i>_p). The response surface test revealed that the preferred materiality factors were 2.935 × 10⁸ Pa for <i>G</i>_<i>p</i>, 4.069 × 10⁷ N/m³ for <i>k</i>_<i>n</i>, 3.147 × 10⁷ N/m³ for <i>k</i>_<i>s</i>, and 1.036 mm for <i>R</i>_<i>B</i>. On this occasion, the large flat kernel’s simulated ventral and lateral compressive destructive forces were 325.16 N and 114.94 N, with an error of 0.40% and 0.85% from the measured values. A comparison of particle morphologies during simulated and actual compression revealed that the large flat kernel’s ventral and lateral compression states were highly consistent. Simulations of large spherical kernel’s compression with the optimal parameters comprehensively verified the accuracy of the corn kernel bonded particle model constructed, as well as the calibrated simulation input parameters. The investigations of this study could provide a reliable theoretical foundation for the later construction of corn ear DEM models to simulate the threshing process or research into the crushing problem of corn kernels.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 2","pages":"1001 - 1017"},"PeriodicalIF":2.8,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143919117","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 smoothed particle Galerkin method in orthogonal cutting simulations","authors":"Zihui Zhang,&nbsp;Xuanyu Sheng","doi":"10.1007/s40571-024-00843-7","DOIUrl":"10.1007/s40571-024-00843-7","url":null,"abstract":"<div><p>This paper explores the application of the smoothed particle Galerkin (SPG) method in orthogonal cutting simulation, aiming to assess its accuracy and stability in predicting chip morphology and cutting force compared to conventional methods such as the finite element method (FEM) and the smoothed particle hydrodynamics (SPH) method. By conducting a comparative analysis with FEM and SPH techniques, the study evaluates SPG’s efficacy in simulating chip morphology, stress distribution, and cutting force prediction. Results indicate that the SPG method yields more consistent and uniform chip morphology, a more evenly distributed chip stress profile, and mitigates cutting force variation, thereby providing a more realistic portrayal of dynamic responses during the cutting process. Simulations are conducted across various particle distance, revealing SPG’s superior consistency in cutting force prediction across different mesh sizes. Furthermore, this study scrutinizes the influence of key parameters within the SPG method, including normalization parameters, kernel function type, and damage mechanism, on simulation outcomes. Findings suggest that normalization parameters and the choice of damage mechanism significantly impact cutting force and deformation, while the selection of kernel function affects simulation convergence.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 2","pages":"933 - 945"},"PeriodicalIF":2.8,"publicationDate":"2024-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143919067","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":"Micromechanical characteristics of viscocohesive granular flows down a rough inclined plane","authors":"Thanh-Trung Vo,&nbsp;Trung-Kien Nguyen,&nbsp;Nhu H. T. Nguyen,&nbsp;Thanh-Hai Nguyen,&nbsp;Cuong T. Nguyen","doi":"10.1007/s40571-024-00842-8","DOIUrl":"10.1007/s40571-024-00842-8","url":null,"abstract":"<div><p>Gravity-driven flows of unsaturated granular materials on inclined planes are ubiquitous in natural hazards such as landslides. The geological hazard flows can behave as a solid-like phase, liquid-like phase, or both phases along the flow height depending on different parameters and triggering conditions. Although extensive research on the granular flows down an inclined surface has been carried out to elucidate the mechanism of such gravitational flows, the micromechanical properties of viscocohesive granular materials simultaneously appearing in different flow phases remain debated. Here, we explore the effects of two principal parameters, namely cohesive stress between grains and liquid viscosity, on the micromechanical behavior of viscocohesive granular flows down an inclined plane in the steady-flowing state. The results showed that the viscocohesive granular flows may or may not be roughly divided into solid-like, liquid-like, and solid–liquid transition regions depending on the magnitude of the cohesive stress and liquid viscosity. In the case of together forming these regions along the height of viscocohesive granular flows, the cohesive stress uniformly affects the density and intensity of the compressive and tensile forces. In contrast, the compressive forces in the solid-like and liquid-like regions show an opposite influence on the liquid viscosity. These complexities may be explained by the intrinsic properties of the liquid binding, the particles’ gravity, and the collisional forces between grains. These observations of the micromechanical properties of viscocohesive granular flows insightfully highlight all phases along the flow height, providing physical origins of geological landslide flows.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 2","pages":"921 - 932"},"PeriodicalIF":2.8,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143919230","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":"Study on the microstructural evolution of gangue cemented backfill under uniaxial compression","authors":"Dongmei Huang,&nbsp;Xin Pan,&nbsp;Xikun Chang,&nbsp;Shuyu Qiao,&nbsp;Daqian Xing,&nbsp;Xinzhao Wang","doi":"10.1007/s40571-024-00821-z","DOIUrl":"10.1007/s40571-024-00821-z","url":null,"abstract":"<div><p>In cemented paste backfill (CPB), the connection mode and spatial position arrangement of particles determine the deformation, structural strength and stability of the backfill. Based on the scanning electron microscope images of CPB, the representative elementary area (REA) of the pore structure of CPB is obtained. The actual microstructure of CPB in PFC^2D according to REA was modeled, and the microscopic parameters of the model based on the results of indoor uniaxial compression tests were calibrated. Finally, by studying the microstructure, mechanical properties, force chain, normal contact force, tangential contact force and coordination number of CPB with different curing time (3 days, 7 days, 28 days), the internal relationship between mesoscopic parameters and macroscopic mechanical properties during CPB development was analyzed. Exploring the changes of mesostructure during the development of CPB is of great significance to the study of heterogeneous structure and multi-scale mechanical theory system.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 1","pages":"557 - 571"},"PeriodicalIF":2.8,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143553776","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":"Digging characteristics of grab based on DEM-MBD simulation and experiment","authors":"Fangping Ye,&nbsp;Tianye Lu,&nbsp;Chang Xu","doi":"10.1007/s40571-024-00823-x","DOIUrl":"10.1007/s40571-024-00823-x","url":null,"abstract":"<div><p>The grab bucket plays an important role in the construction process of dredging, and analyzing the excavation characteristics of the grab is helpful for the mechanical design of the grab bucket. In this investigation, the digging device and the digging mudstone are detailed as a system dynamic process, and a theoretical model for calculating digging resistance is established based on the Rankine theory. Furthermore, the particle shear test is performed to analyze the influence of changes in sand physical parameters on its shear characteristics. The DEM-MBD coupling simulation is adopted to calculate the particle distribution and the digging trajectory, and the influence of digging depth and particle cohesion strength is analyzed on the digging resistance. Moreover, an excavator digging experimental platform is established to validate the feasibility of the experimental results. The results show that the 10% moisture content is the inflection point of the sand particles physical and mechanical properties, and its shear strength decreases with the augment of moisture content; the variation law of the simulation results is consistent with the theoretical calculation, and the digging resistance reduction is proportional to the cohesion strength when the particles are completely sheared; the same key point parameter error of the digging curve obtained by the test and the simulation are consistent.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 1","pages":"573 - 584"},"PeriodicalIF":2.8,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143553704","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":"Pull-out characteristics of rock bolts under the influence of “natural” coupled fractures","authors":"Hao Shi,&nbsp;Wenlong Chen,&nbsp;Houquan Zhang,&nbsp;Xuepeng Zhang,&nbsp;Lei Song,&nbsp;Ming Li,&nbsp;Linlin Liu","doi":"10.1007/s40571-024-00844-6","DOIUrl":"10.1007/s40571-024-00844-6","url":null,"abstract":"<div><p>This study investigates the pull-out characteristics of rock bolts with “natural” fractures induced by coupled dynamic-static load, which is imperative for assessing the stability of engineering structures and averting engineering disasters. “Natural” fractures under dynamic-static coupled load were simulated using a biaxial compression model and a SHPB model utilizing the PFC^2D software. These coupling fractures were then incorporated into the bolt pull-out model after extraction and amplification. The impacts of these fractures on bolt’s anti pull-out properties and the related micro-mechanical mechanism of bolt-rock interaction were analyzed. The results are as following: (1) The axial bolt load peak value, new crack numbers, and AE event peak values generally decrease as the pull-out specimen’s damage degree increases. There’s a critical threshold for impact damage affecting the bolt’s pull-out characteristics, indicating that significant structural failure of the pull-out specimen must occur for notable changes in bolt pull-out characteristics. (2) The bolt’s peak axial load declines with increasing fracture numbers and impact time and is weakly related to the peak displacement. Bolt tensile stiffness decreases with the rise in fracture number, biaxial compression confining pressure, and impact time. (3) The contact force accumulation within the rock mass evolves from a layered to a networked form as confining pressure increases. The distribution number of dynamic load-induced fractures directly impacts the rock mass’s loading area and contact force transfer path. (4) The magnitude of normal and tangential contact forces is positively correlated with the load level. Rapid changes in particle’s indirect contact force lead to a certain deviation in the distribution direction of normal and tangential contact forces during the post-peak phase.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 3","pages":"1389 - 1409"},"PeriodicalIF":2.8,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145171728","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":"Study on mesoscopic mechanism of water inrush in foundation pit based on discrete element method","authors":"Yuqi Li,&nbsp;Yue Wang,&nbsp;Junhao Zhang,&nbsp;Bingbing Ma,&nbsp;Mingyue Zhang","doi":"10.1007/s40571-024-00827-7","DOIUrl":"10.1007/s40571-024-00827-7","url":null,"abstract":"<div><p>With the development of urbanization, a large number of foundation pits have been built. Water inrush is one of the most important causes of foundation pit accidents, and it is of great significance to understand the process and mechanism of water inrush. A laboratory small-scale water inrush test at foundation pit base was established by using discrete element method and numerical simulation was conducted on the water inrush failure of aquitard. The water inrush process of Shanghai clay ⑤₁ was divided into continuous deformation stage, equilibrium stage, and failure stage. The mechanism of water inrush failure was explained from a mesoscopic perspective, and the trend of the development and evolution of cracks was studied. The variation laws of monitoring variables such as porosity, coordination number, and the particle displacement of observation points were analyzed. The influences of vertical weak area in pit base and the thickness and properties of aquitard on water inrush were further discussed. The research work in this paper not only provides a new perspective for the analysis of water inrush failure in foundation pits, but also provides a reference for the simulation of fluid–solid coupling in other geotechnical engineering.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 1","pages":"613 - 630"},"PeriodicalIF":2.8,"publicationDate":"2024-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143554021","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}