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Assessment of slurry chamber clogging alleviation during ultra-large-diameter slurry tunnel boring machine tunneling in hard-rock using computational fluid dynamics-discrete element method:A case study 认领 引用 被引量：2
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作者 Yidong Guo Xinggao Li +2 位作者 Dalong Jin Hongzhi Liu Yingran Fang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2025年第8期4715-4734,共20页
To fundamentally alleviate the excavation chamber clogging during slurry tunnel boring machine(TBM)advancing in hard rock,large-diameter short screw conveyor was adopted to slurry TBM of Qingdao Jiaozhou Bay Second Un... To fundamentally alleviate the excavation chamber clogging during slurry tunnel boring machine(TBM)advancing in hard rock,large-diameter short screw conveyor was adopted to slurry TBM of Qingdao Jiaozhou Bay Second Undersea Tunnel.To evaluate the discharging performance of short screw conveyor in different cases,the full-scale transient slurry-rock two-phase model for a short screw conveyor actively discharging rocks was established using computational fluid dynamics-discrete element method(CFD-DEM)coupling approach.In the fluid domain of coupling model,the sliding mesh technology was utilized to describe the rotations of the atmospheric composite cutterhead and the short screw conveyor.In the particle domain of coupling model,the dynamic particle factories were established to produce rock particles with the rotation of the cutterhead.And the accuracy and reliability of the CFD-DEM simulation results were validated via the field test and model test.Furthermore,a comprehensive parameter analysis was conducted to examine the effects of TBM operating parameters,the geometric design of screw conveyor and the size of rocks on the discharging performance of short screw conveyor.Accordingly,a reasonable rotational speed of screw conveyor was suggested and applied to Jiaozhou Bay Second Undersea Tunnel project.The findings in this paper could provide valuable references for addressing the excavation chamber clogging during ultra-large-diameter slurry TBM tunneling in hard rock for similar future. 展开更多
关键词 Slurry tunnel boring machine(TBM) Short screw conveyor Slurry chamber clogging Computational fluid dynamics-discrete element method(CFD-DEM)coupled modeling Engineering application
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Coupled computational fluiddynamics–discrete-element method investigation of soil contact erosion under cyclic hydraulic loading:A multiscale perspective 认领 引用
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作者 Xianfeng Diao Guoqing Cai +3 位作者 Tao Liu Peiyun Zhang Yanlin Su Bangzheng Rao 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第6期4812-4830,共19页
Tidal waves,intermittent rainfall,and fluctuations in water levels,which create cyclic hydraulic gradients,can exacerbate the migration of fine particles within soils and lead to deterioration in stability.However,mac... Tidal waves,intermittent rainfall,and fluctuations in water levels,which create cyclic hydraulic gradients,can exacerbate the migration of fine particles within soils and lead to deterioration in stability.However,macroscale experimental methods struggle to capture the microscopic deformations that occur during seepage-induced erosion.Therefore,this study,which is based on the coupled computational fluid dynamics–discrete element method(CFD–DEM)coupling method,investigates the contact mechanical mechanisms that induce macroscopic deformation under cyclic hydraulic gradients by considering the effects of different amplitudes and frequencies.The results show that the erosion mass of fine particles increases in a stepwise manner,with a multipeak variation in the erosion rate,and both the erosion amount and intensity are greater under constant gradient conditions.Fine particles erode primarily near the contact surface and,after migration,accumulate mainly in the coarse particle layers close to the contact surface.Increasing the amplitude and frequency of the cyclic hydraulic gradient leads to more fine particle blockages within the coarse particle layer.The cyclic hydraulic gradient causes the contact force chain network to repeatedly break and reorganize,reducing the shear strengths of the soil and resulting in more pronounced anisotropy in the contact force distribution. 展开更多
关键词 Computational fluid dynamics–discrete element method(CFD–DEM)coupling Contact erosion Cyclic hydraulic gradients Macroscopic deformation Micromechanism
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Computational fluid dynamics-discrete element method simulation of stirred tank reactor for graphene production 认领 引用 被引量：1
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作者 Shuaishuai Zhou Jing Li +5 位作者 Kaixiang Pang Chunxi Lu Feng Zhu Congzhen Qiao Yajie Tian Jingwei Zhang 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2023年第12期196-207,共12页
Liquid phase exfoliation(LPE)process for graphene production is usually carried out in stirred tank reactor and the interactions between the solvent and the graphite particles are important as to improve the productio... Liquid phase exfoliation(LPE)process for graphene production is usually carried out in stirred tank reactor and the interactions between the solvent and the graphite particles are important as to improve the production efficiency.In this paper,these interactions were revealed by computational fluid dynamics–discrete element method(CFD-DEM)method.Based on simulation results,both liquid phase flow hydrodynamics and particle motion behavior have been analyzed,which gave the general information of the multiphase flow behavior inside the stirred tank reactor as to graphene production.By calculating the threshold at the beginning of graphite exfoliation process,the shear force from the slip velocity was determined as the active force.These results can support the optimization of the graphene production process. 展开更多
关键词 Computational fluid dynamics Discrete element method Stirred tank LPE process Liquid-particle interactions
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Computational fluid dynamics simulations of respiratory airflow in human nasal cavity and its characteristic dimension study 认领 引用 被引量：3
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作者 Jun Zhang Yingxi Liu +2 位作者 Xiuzhen Sun Shen Yu Chi Yu 《Acta Mechanica Sinica》 SCIE EI CAS 2008年第2期223-228,共6页
To study the airflow distribution in human nasal cavity during respiration and the characteristic parameters of nasal structure, three-dimensional, anatomically accurate representations of 30 adult nasal cavity models... To study the airflow distribution in human nasal cavity during respiration and the characteristic parameters of nasal structure, three-dimensional, anatomically accurate representations of 30 adult nasal cavity models were recons- tructed based on processed tomography images collected from normal people. The airflow fields in nasal cavities were simulated by fluid dynamics with finite element software ANSYS. The results showed that the difference of human nasal cavity structure led to different airflow distribution in the nasal cavities and variation of the main airstream passing through the common nasal meatus. The nasal resistance in the regions of nasal valve and nasal vestibule accounted for more than half of the overall resistance. The characteristic model of nasal cavity was extracted on the basis of characteristic points and dimensions deduced from the original models. It showed that either the geometric structure or the airflow field of the two kinds of models was similar. The characteristic dimensions were the characteristic parameters of nasal cavity that could properly represent the original model in model studies on nasal cavity. 展开更多
关键词 Nasal cavity Characteristic dimension Three-dimensional reconstruction Numerical simulation of flowfield Computational fluid dynamic Finite element method
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Stabilization for Equal-Order Polygonal Finite Element Method for High Fluid Velocity and Pressure Gradient 认领 引用 被引量：2
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作者 T.Vu-Huu C.Le-Thanh +1 位作者 H.Nguyen-Xuan M.Abdel-Wahab 《Computers, Materials & Continua》 SCIE EI 2020年第3期1109-1123,共15页
This paper presents an adapted stabilisation method for the equal-order mixed scheme of finite elements on convex polygonal meshes to analyse the high velocity and pressure gradient of incompressible fluid flows that ... This paper presents an adapted stabilisation method for the equal-order mixed scheme of finite elements on convex polygonal meshes to analyse the high velocity and pressure gradient of incompressible fluid flows that are governed by Stokes equations system.This technique is constructed by a local pressure projection which is extremely simple,yet effective,to eliminate the poor or even non-convergence as well as the instability of equal-order mixed polygonal technique.In this research,some numerical examples of incompressible Stokes fluid flow that is coded and programmed by MATLAB will be presented to examine the effectiveness of the proposed stabilised method. 展开更多
关键词 Polygonal finite element method fluid computation stokes equation mixed method local projection
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MIXED COMPATIBLE ELEMENT AND MIXED HYBRID INCOMPATIBLE ELEMENT VARIATIONAL METHODS IN DYNAMICS OF VISCOUS BAROTROPIC FLUIDS 认领 引用
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作者 沈孝明 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1994年第6期561-569,共9页
This paper presents and proves the mixed compatible finite element variationalprinciples in dynamics of viscous barotropic fluids. When the principles are proved, itis found that the compatibility conditions of stress... This paper presents and proves the mixed compatible finite element variationalprinciples in dynamics of viscous barotropic fluids. When the principles are proved, itis found that the compatibility conditions of stress can be naturally satisfied. The gene-rallzed variational principles with mixed hybrid incompatible finite elements are alsopresented and proved, and they can reduce the computation of incompatible elements indynamics of viscous barotropic flows. 展开更多
关键词 mechanics of viscous fluids computational fluid mechanics vari-ational principle finite element method mixed compatible el-ement mixed hybrid incompatible element
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CVBEM and FVM Computational Model Comparison for Solving Ideal Fluid Flow in a 90-Degree Bend 认领 引用
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作者 Colin Bloor Theodore V. Hromadka II +1 位作者 Bryce Wilkins Howard McInvale 《Open Journal of Fluid Dynamics》 2016年第4期430-437,共8页
While finite volume methodologies (FVM) have predominated in fluid flow computations, many flow problems, including groundwater models, would benefit from the use of boundary methods, such as the Complex Variable Boun... While finite volume methodologies (FVM) have predominated in fluid flow computations, many flow problems, including groundwater models, would benefit from the use of boundary methods, such as the Complex Variable Boundary Element Method (CVBEM). However, to date, there has been no reporting of a comparison of computational results between the FVM and the CVBEM in the assessment of flow field characteristics. In this work, the CVBEM is used to develop a flow field vector outcome of ideal fluid flow in a 90-degree bend which is then compared to the computational results from a finite volume model of the same situation. The focus of the modelling comparison in the current work is flow field trajectory vectors of the fluid flow, with respect to vector magnitude and direction. Such a comparison is necessary to validate the development of flow field vectors from the CVBEM and is of interest to many engineering flow problems, specifically groundwater modelling. Comparison of the CVBEM and FVM flow field trajectory vectors for the target problem of ideal flow in a 90-degree bend shows good agreement between the considered methodologies. 展开更多
关键词 Complex Variable Boundary Element Method Finite Volume Method Ideal Fluid Flow 90-Degree Bend Computational Fluid Dynamics
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NUMERICAL SIMULATION OF UNSTEADY-STATE UNDEREXPANDED JET USING DISCONTINUOUS GALERKIN FINITE ELEMENT METHOD 认领 引用 被引量：3
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作者 陈二云 李志刚 +3 位作者 马大为 乐贵高 赵改平 任杰 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2008年第2期89-93,共5页
A discontinuous Galerkin finite element method （DG-FEM） is developed for solving the axisymmetric Euler equations based on two-dimensional conservation laws. The method is used to simulate the unsteady-state underex... A discontinuous Galerkin finite element method （DG-FEM） is developed for solving the axisymmetric Euler equations based on two-dimensional conservation laws. The method is used to simulate the unsteady-state underexpanded axisymmetric jet. Several flow property distributions along the jet axis, including density, pres- sure and Mach number are obtained and the qualitative flowfield structures of interest are well captured using the proposed method, including shock waves, slipstreams, traveling vortex ring and multiple Mach disks. Two Mach disk locations agree well with computational and experimental measurement results. It indicates that the method is robust and efficient for solving the unsteady-state underexpanded axisymmetric jet. 展开更多
关键词 jets computational fluid dynamics multiple Mach disks vortex ring discontinuous Galerkin finite element method
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Analysis of gas-solid flow and shaft-injected gas distribution in an oxygen blast furnace using a discrete element method and computational fluid dynamics coupled model 认领 引用 被引量：4
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作者 Zeshang Dong Jingsong Wang +2 位作者 Haibin Zuo Xuefeng She Qingguo Xue 《Particuology》 SCIE EI CAS CSCD 2017年第3期63-72,共10页
lronmaking using an oxygen blast furnace is an attractive approach for reducing energy consumption in the iron and steel industry. This paper presents a numerical study of gas-solid flow in an oxygen blast fur- nace b... lronmaking using an oxygen blast furnace is an attractive approach for reducing energy consumption in the iron and steel industry. This paper presents a numerical study of gas-solid flow in an oxygen blast fur- nace by coupling the discrete element method with computational fluid dynamics. The model reliability was verified by previous experimental results. The influences of particle diameter, shaft tuyere size, and specific ratio （X） of shaft-injected gas （51G） flowrate to total gas flowrate on the SIC penetration behavior and pressure field in the furnace were investigated. The results showed that gas penetration capacity in the furnace gradually decreased as the particle diameter decreased from 100 to 40 mm. Decreasing particle diameter and increasing shaft tuyere size both slightly increased the SIG concentration near the furnace wall but decreased it at the furnace center. The value of X has a significant impact on the SIG distribution. According to the pressure fields obtained under different conditions, the key factor affecting SIG penetration depth is the pressure difference between the upper and lower levels of the shaft tuyere. If the pressure difference is small, the SIG can easily penetrate to the furnace center. 展开更多
关键词 Oxygen blast furnace Discrete element method Computational fluid dynamics Shaft gas injection Gas-solid flow Pressure field
Application of the Hierarchical Functions Expansion Method for the Solution of the Two Dimensional Navier-Stokes Equations for Compressible Fluids in High Velocity 认领 引用
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作者 Thadeu das Neves Conti Eduardo Lobo Lustosa Cabral Gaianê Sabundjian 《Energy and Power Engineering》 2017年第2期86-99,共14页
This work presents a new application for the Hierarchical Function Expansion Method for the solution of the Navier-Stokes equations for compressible fluids in two dimensions and in high velocity. This method is based ... This work presents a new application for the Hierarchical Function Expansion Method for the solution of the Navier-Stokes equations for compressible fluids in two dimensions and in high velocity. This method is based on the finite elements method using the Petrov-Galerkin formulation, know as SUPG (Streamline Upwind Petrov-Galerkin), applied with the expansion of the variables into hierarchical functions. To test and validate the numerical method proposed as well as the computational program developed simulations are performed for some cases whose theoretical solutions are known. These cases are the following: continuity test, stability and convergence test, temperature step problem, and several oblique shocks. The objective of the last cases is basically to verify the capture of the shock wave by the method developed. The results obtained in the simulations with the proposed method were good both qualitatively and quantitatively when compared with the theoretical solutions. This allows concluding that the objectives of this work are reached. 展开更多
关键词 Computational Fluid Mechanics Compressible Flow Finite Elements Method Navier-Stokes Equations Shock Waves
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A Generic Computational Solution of a Natural Convection Flow past an Infinite Vertical Porous Plate 认领 引用
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作者 Harouna Naroua Moussa Idi Bachir 《American Journal of Computational Mathematics》 2016年第4期287-297,共11页
A simulation was carried out on an unsteady flow of a viscous, incompressible and electrically conducting fluid past an infinite vertical porous plate. A generic computer program using the Galerkin finite element meth... A simulation was carried out on an unsteady flow of a viscous, incompressible and electrically conducting fluid past an infinite vertical porous plate. A generic computer program using the Galerkin finite element method is employed to solve the coupled non-linear differential equations for velocity and temperature fields. The diffusion equation, the energy equation, the momentum equations and other relevant parameters are transformed into interpretable postfix codes. Numerical calculations are carried out on the flow fields both in the presence of cooling and heating of the plate by free convection currents. The effects of the dimensionless parameters, namely, the Prandtl number, the Eckert number, the modified Grashof number, the Schmidt number and the time on the temperature and velocity distributions are discussed. 展开更多
关键词 Computer Simulation Generic Software Tool Finite Element Method Laminar Fluid Flow
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深部煤层气转向压裂缝内暂堵剂运移封堵数值模拟 认领 引用 被引量：2
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作者 任岚 赵格 +4 位作者 林然 任千秋 吴建发 宋毅 沈骋 《大庆石油地质与开发》 CAS 北大核心 2026年第2期59-67,共9页
在煤层气开发过程中,由于深部煤岩塑性强、地应力差大,主要采用暂堵转向压裂技术促进缝网复杂扩展,但压裂现场数据表明,部分压裂段暂堵参数不合理,未能实现暂堵剂在裂缝中的成功架桥封堵,导致裂缝转向失败进而影响压裂效果。考虑裂缝内... 在煤层气开发过程中,由于深部煤岩塑性强、地应力差大,主要采用暂堵转向压裂技术促进缝网复杂扩展,但压裂现场数据表明,部分压裂段暂堵参数不合理,未能实现暂堵剂在裂缝中的成功架桥封堵,导致裂缝转向失败进而影响压裂效果。考虑裂缝内支撑剂砂堤对暂堵剂运移的影响,基于计算流体动力学(CFD)和离散元方法 (DEM)耦合建立了煤岩水力裂缝内暂堵剂颗粒运移封堵数值模型,探究了不同施工参数下暂堵剂颗粒架桥行为和暂堵效率。结果表明:暂堵剂注入时粒径体积比最佳为4∶1;压裂液黏度、暂堵剂体积分数、流体注入速度等关键因素会影响暂堵卡堵架桥时间、架桥暂堵体积大小和卡堵距离;入口缝宽与暂堵剂体积无显著关联,不同裂缝缝宽均能有效暂堵。研究成果为深部煤层气的现场暂堵转向工艺及人工缝网调控机制提供了理论指导。 展开更多
关键词 暂堵剂 运移封堵 深部煤层气 流体动力学与离散元方法耦合(CFD-DEM)
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基于CFD-DEM耦合方法的浮冰区船舶阻力数值模拟 认领 引用
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作者 徐佩 郭迎春 +2 位作者 寇莹 王超 孙乾洋 《振动与冲击》 EI CSCD 北大核心 2026年第13期60-70,共11页
基于计算流体力学-离散元耦合方法(computational fluid dynamics-discrete element method,CFD-DEM),运用STAR-CCM+软件,对船舶在浮冰区航行过程中的冰阻力特性与破冰机理开展了系统的数值模拟分析。为保证模拟结果的数值可靠性,首先... 基于计算流体力学-离散元耦合方法(computational fluid dynamics-discrete element method,CFD-DEM),运用STAR-CCM+软件,对船舶在浮冰区航行过程中的冰阻力特性与破冰机理开展了系统的数值模拟分析。为保证模拟结果的数值可靠性,首先完成了网格收敛性验证,并通过多尺度网格加密及敏感性分析,确定了兼顾计算效率与模拟精度的最优数值模型。研究重点考察了船舶航速与浮冰厚度两个关键参数对冰阻力的非线性影响规律,揭示了船-冰相互作用中冰阻力变化与破碎能量耗散的内在机制。进一步从应力波传播、断裂模式、动能转化等角度,对不同工况下浮冰的破碎程度、裂纹扩展路径及碎冰堆积形态进行了定量评估与定性分析。该研究深化了对船-冰-水多相耦合动力学行为的理解,并为极地船舶冰区航行性能优化与抗冰结构设计提供了可靠的数值分析方法与工程参考。 展开更多
关键词 浮冰 船舶 计算流体力学-离散元耦合方法(CFD-DEM) 冰阻力 数值模拟
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细丝状生物质颗粒群在旋风分离器内流动特性 认领 引用
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作者 顾丛汇 梁星宇 +3 位作者 张安淯 邓开元 朱静雨 赵海超 《化工进展》 EI CAS CSCD 北大核心 2026年第1期71-81,共11页
细丝状生物质颗粒独特的易变形结构特征,极大程度上增加了其流动复杂性,进而影响生物质燃料能源转换效率。本文采用实验与计算流体力学-离散元法(CFD-DEM)数值模拟方法,研究了气相速度和固相颗粒浓度对细丝状生物质颗粒群在旋风分离器... 细丝状生物质颗粒独特的易变形结构特征,极大程度上增加了其流动复杂性,进而影响生物质燃料能源转换效率。本文采用实验与计算流体力学-离散元法(CFD-DEM)数值模拟方法,研究了气相速度和固相颗粒浓度对细丝状生物质颗粒群在旋风分离器内流动行为与输运特性的影响。由实验和模拟结果可知,颗粒群在旋风分离器内呈贴壁螺旋下落运动趋势,速度逐渐减小,旋转圈数随气速增加而增加。随着气速和颗粒浓度增加,颗粒与壁面之间作用力先增大后减小。颗粒群出口角度和扩散角度在气速6.2m/s、颗粒浓度0.194kg/m3 时达到最大值,分别为76.18°和115.56°,该工况下颗粒造碎概率最大。当气速为3.5m/s、颗粒浓度为0.141kg/m3 时,有利于降低颗粒造碎概率,提高颗粒结构一致性,为优化旋风分离器结构和燃料反应过程提供理论参考。 展开更多
关键词 生物质 非球形颗粒 旋风分离器 流动特性 计算流体力学-离散元法
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基于CFD-DEM模拟的泥水盾构短螺旋输送机泥渣滞排优化 认领 引用
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作者 杨益 张志浩 +3 位作者 李兴高 汪青杰 郭易东 郑帅 《隧道建设（中英文）》 EI CSCD 北大核心 2026年第3期631-644,共14页
为解决大直径泥水盾构在青岛胶州湾第二海底隧道工程中遭遇的高黏性地层泥渣滞排难题,提出并评估一种短螺旋输送机辅助排渣方案。采用计算流体动力学与离散元法(CFD-DEM)耦合的数值模拟方法,建立包含刀盘、泥水舱及排浆系统的1∶1全尺... 为解决大直径泥水盾构在青岛胶州湾第二海底隧道工程中遭遇的高黏性地层泥渣滞排难题,提出并评估一种短螺旋输送机辅助排渣方案。采用计算流体动力学与离散元法(CFD-DEM)耦合的数值模拟方法,建立包含刀盘、泥水舱及排浆系统的1∶1全尺寸模型,将JKR接触模型作为等效数值工具,通过室内黏附剪切试验数据标定表面能参数,以准确再现含水黏土颗粒间的宏观黏附与团聚行为。通过设置含短螺旋输送机的试验组与传统结构的对照组,系统对比分析2种方案在流场特性、颗粒运移、排渣效率及能耗等方面的差异。结果表明:1)短螺旋输送机显著改善了泥水舱内的流场均匀性,流速标准差由0.82 m/s降至0.47 m/s,有效缓解了局部滞流。2)颗粒滞留现象得到根本性改善,舱内颗粒滞留比例由对照组的30%~40%大幅降至约10%。3)排渣模式由间歇性转变为连续稳定,试验组在启动90 s后排渣效率迅速提升并稳定在约250.00 kg/s、接近258.00 kg/s的理论掘进排渣率,180 s内累计排渣量较对照组提高了238%。4)尽管启动初期能耗略增,但系统稳定运行后(2 min)总能耗显著降低,在3 min循环周期内,综合能耗降低了12.8%。 展开更多
关键词 泥水盾构 泥渣滞排 短螺旋输送机 CFD-DEM耦合分析
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可变形水下作业机器人总体设计及作业分析 认领 引用
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作者 张云飞 杨少龙 +1 位作者 吴丁一 向先波 《中国舰船研究》 CSCD 北大核心 2026年第2期125-136,共12页
[目的]针对现有水下机器人单次下潜难以兼顾大范围探测与高精度作业的痛点,设计一款可变形水下作业机器人,实现水深1000 m内的低阻巡航、双臂协同作业等功能,满足海洋风电系统及水下油气平台等的巡检与维护需求。[方法]首先,明确机器人... [目的]针对现有水下机器人单次下潜难以兼顾大范围探测与高精度作业的痛点,设计一款可变形水下作业机器人,实现水深1000 m内的低阻巡航、双臂协同作业等功能,满足海洋风电系统及水下油气平台等的巡检与维护需求。[方法]首先,明确机器人总体设计指标,优化整体设计流程,完成机器人舱体及设备布置,设计变形机构(丝杆顶升机构)、耐压舱等关键结构,并基于有限元分析完成1000 m水深对应的12 MPa压力下关键部位强度校核;其次,分析巡航模式下的续航能力与机动性能,以及作业模式下的机械臂工作空间与稳定性;最后,通过CFD仿真验证阻力特性,基于Matlab建立耦合动力学模型,验证自恢复、抗扰动及手-艇耦合抑制性能。[结果]所设计机器人内部总体布置合理,关键部位满足1000 m深海作业要求,耐压舱最大应力小于采用材料的屈服压力;巡航模式下机器人极限续航为7 h,所搭载推进器能有效满足机器人水下灵活运动,以6 kn速度航行时纵向阻力仅-725.06 N,各类工况下航行阻力明显低于作业模式,具备低阻特性;作业模式下中部浮力材料升起270 mm,重心与浮心高度差增加0.054 m,最大恢复力矩较巡航模式提升202.1%,机器人具备更高的作业稳定性,其横倾自恢复时间从180 s缩短至60 s,同时具备更好的抗扰动能力,双臂作业空间覆盖机体侧方、前方及下方区域,协同作业空间有效。[结论]通过自主形态切换,提出的可变形水下作业机器人总体设计方案具备多任务的执行能力,可实现巡航模式低阻探测与作业模式高稳作业的有机结合,为深海复杂场景下的水下作业提供了新的方案。 展开更多
关键词 可变形水下机器人 水下机器人-机械臂作业系统 稳定性分析 有限元分析 计算流体力学
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印染污泥-煤粉混烧流化床锅炉内埋管冲蚀磨损数值模拟研究 认领 引用
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作者 郑小腾 陈星晨 +3 位作者 余焕伟 竺哲明 杜锡勇 许磊 《高技术通讯》 CAS 北大核心 2026年第5期537-550,共14页
采用计算流体力学-离散单元法(computation fluid dynamics-discrete element method,CFD-DEM)耦合剪切冲击损能量模型(shear impact energy model,SIEM)对印染污泥-煤粉颗粒混合气固两相流所致流化床埋管冲蚀磨损开展了数值模拟研究。... 采用计算流体力学-离散单元法(computation fluid dynamics-discrete element method,CFD-DEM)耦合剪切冲击损能量模型(shear impact energy model,SIEM)对印染污泥-煤粉颗粒混合气固两相流所致流化床埋管冲蚀磨损开展了数值模拟研究。分析了气速、初始颗粒分布对流化床内圆管和方管冲蚀磨损特性影响。结果表明,圆管和方管冲蚀磨损率均随气速增大而增大,尤其是埋管底部。原因主要是颗粒动能随气速增大而增大,且埋管底部密度较大的煤粉颗粒比例同样随气速增大而增大。采用了上污泥下煤粉、二者混合以及上煤粉下污泥3种初始分布来研究复杂流化过程中颗粒分布对埋管冲蚀磨损作用。实验结果表明,由于显著的分离作用,上煤粉下污泥初始分布时冲击埋管的主要是密度较小的污泥颗粒进而导致埋管磨损率较小。同样地,不论圆管还是方管,均存在上煤粉下污泥初始分布时磨损率更小的现象。 展开更多
关键词 气固两相流 计算流体力学-离散单元法 流化床 印染污泥-煤粉 冲蚀磨损
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直接空气捕集CO2固定床吸附器模拟研究 认领 引用
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作者 郑家乐 薛甜甜 +2 位作者 周爱国 宋奥奇 孔繁鑫 《化工环保》 CAS CSCD 北大核心 2026年第3期390-396,共7页
采用计算流体力学(CFD)和离散元法(DEM)耦合方法,基于Fluent软件平台,对CO2捕获量达百吨级直接空气捕集(DAC)固定床吸附装置内的流场结构与阻力特性进行了数值模拟研究,分析了床层厚度、入口风速及孔隙率等关键参数对DAC装置内部CO_... 采用计算流体力学(CFD)和离散元法(DEM)耦合方法,基于Fluent软件平台,对CO2捕获量达百吨级直接空气捕集(DAC)固定床吸附装置内的流场结构与阻力特性进行了数值模拟研究,分析了床层厚度、入口风速及孔隙率等关键参数对DAC装置内部CO2捕集过程中压降与流体特性的影响规律。模拟结果表明:床层压降与床层厚度呈线性关系,当床层厚度由80 mm升至200 mm时,床层压降由5.08 kPa上升至12.71 kPa;入口风速与压降值呈正相关,入口风速从0.2 m/s上升至0.8 m/s时,床层压降从3.37 kPa上升至18.68 kPa;床层孔隙率降低会导致压降值显著提高,孔隙率由0.50降至0.25时,压降由2.82 kPa上升至44.52 kPa。模拟结果与现场实测结果高度吻合,低入口风速(0.2 m/s)时的压降模拟误差为18.00%,高入口风速(0.8 m/s)时的压降模拟误差降至0.67%。 展开更多
关键词 直接空气捕集 固定床吸附器 计算流体力学 离散元法
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基于CFD-DEM法的矿山充填料浆对管道磨损的影响 认领 引用
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作者 何文 何耿烽 《中国安全科学学报》 EI CAS CSCD 北大核心 2026年第5期113-121,共9页
为预防矿山充填管道因磨损引发的爆裂、泄漏等安全事故,采用计算流体动力学(CFD)-离散元(DEM)耦合方法,研究充填料浆对管道磨损的影响特征。构建L型管道和固液两相流模型,开展数值模拟试验,以颗粒粒径(0.001~0.1 mm)、料浆固相体积分数(... 为预防矿山充填管道因磨损引发的爆裂、泄漏等安全事故,采用计算流体动力学(CFD)-离散元(DEM)耦合方法,研究充填料浆对管道磨损的影响特征。构建L型管道和固液两相流模型,开展数值模拟试验,以颗粒粒径(0.001~0.1 mm)、料浆固相体积分数(60%~80%)和料浆流速(2~6 m/s)为试验中充填料浆的变化参数,探究不同颗粒粒径、料浆固相体积分数和料浆流速下管道的最大磨损率。结果表明:颗粒粒径及料浆固相体积分数与管道最大磨损率呈非线性关系,0.1 mm粒径时管道的最大磨损率为13.4×10-5kg/m2;料浆固相体积分数存在临界值70%,其最大磨损率为7.15×10-5kg/m2,超过该固相体积分数后管道磨损趋于稳定;料浆流速与管道最大磨损率呈线性关系,流速7 m/s时,最大磨损率为8.25×10-6kg/m2。各参数对管道磨损影响的大小依次为:颗粒粒径>料浆固相体积分数>料浆流速;颗粒粒径与料浆固相体积分数的交互作用影响最大,料浆固相体积分数和料浆流速的交互作用次之,颗粒粒径和料浆流速交互作用影响最小。 展开更多
关键词 计算流体动力学(CFD)-离散元(DEM) 矿山 充填料浆 管道磨损 料浆流速 颗粒粒径 固相体积分数
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CFD-DEM simulation of fluid-solid flow of a tapered column separation bed 认领 引用 被引量：5
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作者 Duan Chenlong Sheng Cheng +2 位作者 Wu Lingling Zhao Yuemin He Jinfeng 《International Journal of Mining Science and Technology》 EI CAS CSCD 2015年第5期855-859,共5页
Research on recycling waste Printed Circuit Boards(PCB) is at the forefront of preventing environmental pollution and finding ways to recycle resources.The Tapered Column Separation Bed(TCSB) is invented aiming at dis... Research on recycling waste Printed Circuit Boards(PCB) is at the forefront of preventing environmental pollution and finding ways to recycle resources.The Tapered Column Separation Bed(TCSB) is invented aiming at disposing the problem that fine particles of waste printed circuit boards cannot be separated efficiently so as to obtain further insight about the underlying mechanisms and demonstrate the separation feasibility in the tapered column separation bed.In this work,a Computational Fluid Dynamics(CFD) coupled with Discrete Element Method(DEM) model for two-phase flow has been extended to simulate the fluid-solid flow in the tapered column separation bed.Its validity is demonstrated by its successful capturing the key features of particles' flow pattern,velocity,the pressure distribution,the axial position with time and axial force for particles with different densities.Simulation results show that the plastic particles and resin particles become overflow,while copper particles,iron particles and aluminum particles successively become underflow,with a discharge water flow rate of 1 m^3/h,an obliquity of 30°.The simulated results agree reasonably well with the experimental observation.Using this equipment to separate waste PCBs is feasible,theoretically. 展开更多
关键词 Tapered column separation bed Waste printed circuit boards Computational fluid dynamics Discrete element method Fluid-solid flow
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