Computational Particle Mechanics最新文献

{"title":"Comparison of Eulerian and Lagrangian approaches for the numerical study of the concentration of micro-particles generated from a moving train","authors":"Tahereh Izadi,&nbsp;Omid Abouali","doi":"10.1007/s40571-024-00860-6","DOIUrl":"10.1007/s40571-024-00860-6","url":null,"abstract":"<div><p>Recent studies indicate poor air quality inside the subway system due to the successive generation and accumulation of particles. Many of these particles are iron-containing airborne wear particles generated by the abrasion of brake pads. In the present study, the concentration distribution of wear particles emitted from train brake pads during train braking is investigated. Due to the unsteady three-dimensional turbulent flow caused by the train movement inside the large geometry of the subway system, this numerical modeling requires a high computational cost, especially when the Lagrangian method, which tracks every single particle, is used. So, applying the less expensive Eulerian method, which considers the particle phase as a continuum, is preferable. However, the feasibility of using the Eulerian approach instead of the Lagrangian one should be examined, especially for the large particles emitted from a moving body inside a train-induced turbulent flow field. Therefore, in the present work, the predictions of particle concentration obtained through these two methods are compared. The predictions of the Eulerian method are more continuous and uniform, while those of the Lagrangian method, which is based on the accumulation of individual particles, are more scattered. The results show that the Eulerian method can provide reasonable predictions while maintaining computational efficiency.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 2","pages":"1115 - 1126"},"PeriodicalIF":2.8,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143919098","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":"A hybrid scaling coarse-graining method based on a computational fluid dynamics-discrete element method","authors":"Li Longwei,&nbsp;Li Jian,&nbsp;Li Shichang,&nbsp;Dai Zhangjun,&nbsp;Chen Shanxiong,&nbsp;Wei Xiaoyang","doi":"10.1007/s40571-024-00859-z","DOIUrl":"10.1007/s40571-024-00859-z","url":null,"abstract":"<div><p>A computational fluid dynamics-discrete element method (CFD-DEM) is an important method for simulating the interaction and movement of fluid and particulate materials. Its ability to simulate the mechanical behavior of particulate materials has led to its widespread research and application. However, due to limitations in computer computing power, CFD-DEM is limited in the number of particles it can simulate, making it difficult to achieve simulations at an engineering scale. To solve this issue, this study proposes a hybrid scaling coarse-graining method (HSCGM). This method significantly reduces the number of particles by replacing a collection of small particles with a single large particle. Additionally, the principles of particle motion balance, energy conservation, and the exact scaling model are used to determine the accurate relationship for the interaction force between coarse-grained particles. Finally, the accuracy and efficiency of the calculations are analyzed through Ergun and settling tests. The results show that the HSCGM more accurately simulates the interaction forces between particles and their motion behavior, while significantly improving computational efficiency. The advantages and disadvantages of other fluid–solid coupling methods are also discussed. The HSCGM further advances the application prospects of CFD-DEM at an engineering scale.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 2","pages":"1099 - 1113"},"PeriodicalIF":2.8,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143918973","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 investigation on cavitation characteristics under solid–liquid two-phase conditions in a centrifugal pump","authors":"Yong Wang,&nbsp;Ming Li,&nbsp;Jie Chen,&nbsp;Xiaolin Wang,&nbsp;Yu Huang,&nbsp;Houlin Liu","doi":"10.1007/s40571-024-00850-8","DOIUrl":"10.1007/s40571-024-00850-8","url":null,"abstract":"<div><p>The objective of this paper is to investigate the cavitation characteristics under solid–liquid two-phase conditions in a centrifugal pump using numerical method. The partially-averaged Navier–Stokes (PANS) model and Zwart–Gerber–Belamari (ZGB) model are improved to better predict the cavitating flow. The velocity field, the vorticity field, and the distribution of sand particles at different cavitation stages are elaborated to discuss the effect of sand particles on cavitating flow, and the entropy generation theory is applied to analyze the irreversible flow loss caused by cavitation and particles inside the pump. The results show that compared with the clear water conditions, the energy performance and cavitation performance of the centrifugal pump decrease under solid–liquid two-phase conditions. Sand particles promote the development of cavitation, but also delay the shedding of cavity. Cavity structure influences the distribution of sand particles, and the large-scale cavity will promote the sand particles move toward the center of the flow channel. Cavitation and sand particles both create a decrease in velocity and an increase in vorticity in most areas of the flow channel, which leads to an increase in irreversible flow loss.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 2","pages":"987 - 1000"},"PeriodicalIF":2.8,"publicationDate":"2024-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143919075","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":"Intercepting and impact resistance property of dry particle flow by PFC3D-based slit dam","authors":"Yuqiong He,&nbsp;Lei Tang,&nbsp;Rong Sun,&nbsp;Wenjie Dong","doi":"10.1007/s40571-024-00840-w","DOIUrl":"10.1007/s40571-024-00840-w","url":null,"abstract":"<div><p>Slit dams, as effective open barrier structures, are widely used to intercept granular flows. To investigate the blocking efficiency and impact force magnitude of slit dams, physical experiments are conducted to calibrate numerical simulation tests. In this study, a flume model without lateral confinement is established, and various slit dam configurations are designed to evaluate the effects of pillar spacing, number of pillar rows, and pillar staggering on the blocking efficiency and impact load of granular flows. The results indicate that all three factors are closely related to granular flow blocking and impact forces. (1) The pillar spacing is inversely proportional to the blocking efficiency and impact peak value; as the blocking efficiency decreases, the impact peak value and static passive earth pressure also decrease accordingly. (2) Increasing the number of rows reduces the blocking efficiency and impact force of the first row of slit dams. Compared to a single row of pillars, a double row of pillars reduces the impact force by 3.20%, while a triple row of pillars reduces the impact force by 2.39% compared to a double row. The impact peak value and passive earth pressure on the side pillars increase due to the dispersed granular flow. (3) The staggered pillar structure reduces the blocking efficiency of the first row of slit dams while simultaneously lowering the impact peak value of the front row. The staggered structure can reduce the impact peak value by 1.22%. (4) The experimental results laterally demonstrate that the multi-structural arrangement of slit dams increases particle collisions within the dam body, reducing the impact on the first row of dams and causing some particles to move forward. These findings provide a technical basis for the optimized design of open slit dams, enabling them to exhibit higher performance during the design phase.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 2","pages":"907 - 920"},"PeriodicalIF":2.8,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143919247","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":"Key device design and experimental study of high-speed seedbed preparation for rice paddy sowing","authors":"Gang Zheng,&nbsp;Bing Qi,&nbsp;Wenyi Zhang,&nbsp;Youfu Yang,&nbsp;Hongjun Liu,&nbsp;Youqiang Ding,&nbsp;Yunxia Wang","doi":"10.1007/s40571-024-00837-5","DOIUrl":"10.1007/s40571-024-00837-5","url":null,"abstract":"<div><p>The mechanized water direct seeding technology of rice has the advantages of saving time and labor, saving cost and increasing yield. The existing wheeled tractor direct seeding operation in paddy field mainly has technical problems such as large wheel rut, floating stubble blockage, and high-speed operation backwater, resulting in the quality of seedbed is not up to standard and cannot meet the requirements of direct seeding operation in paddy field. In view of the above problems, a high-speed rice seedbed preparation machine which can be matched with a wheeled tractor was developed. The overall scheme of the machine was put forward, and the structure design of key devices such as rut coverage, stubble burying and ditching was carried out. The corresponding motion analysis and simulation were carried out. Finally, the bench test and field test were carried out. The test results show that the designed operating machine can complete the rutting coverage, stubble burying, ditching and other operations at one time. The coverage rate of wheel track is 98.52%. The stubble rate was 98.89%; the ditch type of the ditching operation is complete and the ditch is clean. The components of the designed machine meet the design requirements, and the operation effect can better meet the operation requirements of high-speed rice seedbed preparation.</p></div>","PeriodicalId":524,"journal":{"name":"Computational Particle Mechanics","volume":"12 1","pages":"759 - 773"},"PeriodicalIF":2.8,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143553771","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":"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":"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}