Proceedings of the 7th International Conference on Discrete Element Methods

Name: Proceedings of the 7th International Conference on Discrete Element Methods
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Xikui Li Yuntian Feng Graham Mustoe(Herausgeber*in)

Springer (Verlag)

Erschienen am 1. Dezember 2016

1455 Seiten

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978-981-10-1926-5 (ISBN)

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Inhalt

Intro
Preface
Committee and Sponsors
Co-chairs
Organization Committee
Sponsors
Contents
Contributors
Plenary and Keynote Lectures
1 DEM Modelling in Geomechanics: Some Recent Breakthroughs
Abstract
1 Introduction
2 Comparison Between Numerical DEM and Analytical Stresses in Partially Saturated Granular Media
2.1 Numerical DEM Modeling of Partially Saturated Granular Media
2.2 Analytical Homogenization of Partially Saturated Granular Media
2.3 DEM Stress Description Validity
3 Tensorial Nature of Capillary Stresses
4 Conclusion
References
2 From Particles in Steady State Shear Bands via Micro-Macro to Macroscopic Rheology Laws
Abstract
1 Introduction
2 Phenomenology
3 Results
4 Conclusions and Outlook
References
3 Discrete Dynamical Model of Multi-stage Twist Superconducting Cable and Prediction of Its Multilayer Stress-Strain Relationship
Abstract
1 Introduction
2 Modified DEM Applied to Multi-continuum by Considering Multiple Nonlinear Contact Models
3 Modeling of Multi-stage Superconducting Cable
4 Prediction of Multilayer Stress-Strain Relationship of Cable
5 Conclusions
References
4 A General Contact Theory for Non-spherical Particles
Abstract
1 Introduction
2 An Energy-Conserving Based Contact Framework
3 A Generic Contact Volume Based Energy-Conserving Model
4 A General Contact Theory for Axi-Symmetric Objects
5 Concluding Remarks
References
5 DEM Simulations in Mining and Mineral Processing
Abstract
1 Introduction
2 Special DEM Technology and Applications
2.1 Determination of Cut-off Particle Size
2.2 DEM Technology Dealing with Medium and High Solid Fractions
3 Conclusions
References
6 Discrete Element Modeling of Ice Loads on Ship and Offshore Structures
Abstract
1 Introduction
2 Ice DEM Modelling
2.1 Ice DEM Modelling with Spherical Particles
Bonding-Breaking Spherical Particles
Particle Size Effect
2.2 Ice Model with Dilated Polyhedral Elements
3 DEM Simulation of Ice Loads
3.1 Ice Load on Conical Offshore and Ship with Spherical Particle
Ice Load on Conical Offshore
Ice Load on Ship Hull
3.2 Ice Load on Ship with Dilated Polyhedral Elements
4 Conclusion
Acknowledgments
References
DEM Theory and Algorithms
7 Evaluation of Coarse Graining DEM Using Representative Particle Model
Abstract
1 Introduction
2 Mathematical Formulation
3 Simulation Details and Results
4 Discussion and Conclusions
References
8 On the Apparent Non-coaxiality of the Tangential Interaction
Abstract
1 Introduction
2 Moment-Rotation Relationships
3 Concluding Remarks
References
9 Sample Size Effect on DEM Simulations of Binary Mixture
Abstract
1 Introduction
2 DEM Samples Preparation
2.1 Samples Preparation
2.2 A-Samples (Rigid Boundaries)
2.3 P-Samples (Periodic Boundaries)
3 Triaxial Compression Simulations
3.1 A-Samples
3.2 P-Samples
4 Conclusions
Acknowledgments
References
10 Evolutions of Fabric and Contact Forces of Granular Materials Under Continuously Varying b Value Using DEM
Abstract
1 Introduction
2 Theories
2.1 Micromechanical Theory
2.2 Discrete Element Method
3 Simulation Program
4 Results
4.1 Stress-Strain-Dilation
4.2 Evolutions of Fabric and Contact Forces
References
11 Random Packing of Tetrahedral Particles Using the Polyhedral and Multi-sphere Discrete Element Method
Abstract
1 Introduction
2 Model Setup
2.1 DEM Contact Model
2.2 Particle Model
3 Simulations
3.1 Particle Bouncing on a Frictional Slope
3.2 Particle Packing
4 Summary
Acknowledgments
References
12 Energy Dissipation During Impact of an Agglomerate Composed of Autoadhesive Elastic-Plastic Particles
Abstract
1 Introduction
2 Preparation of an Agglomerate
3 Impact of an Elastic Agglomerate
4 Impact of an Elastic-Plastic Agglomerate
5 Conclusions
Acknowledgments
References
13 Effect of Particle Shape on Geogrid-Reinforced Granules
Abstract
1 Introduction
2 Laboratory Triaxial Tests of Geogrid Reinforced Glass Beads
3 2D DEM Biaxial Tests of Geogrid Reinforced Granules
4 Conclusions
References
14 Applicability Evaluation of Similarity Principle in Discrete Element Analysis
Abstract
1 Introduction
1.1 Background
2 Similarity and Liquid Bridge Model
2.1 Similarity Principle
2.2 Static Liquid Bridge Model
3 Application of Similarity Principe for Liquid Bridge Model
3.1 Stress-Based Similarity
4 Conclusion
Acknowledgments
References
15 Studies of the Performance of Particle Dampers in Centrifugal Fields and the Influence of Recovery Coefficient on Vibration Suppression
Abstract
1 Introduction
2 DEM Model and Contact Model
3 Influence of Recovery Coefficient on Energy Dissipation Characteristics
3.1 Parameters of the Centrifugal Field Under Different Rotational Speeds and Loads
3.2 Influence of Recovery Coefficient on Energy Dissipation Characteristics Under Different Rotational Speeds
3.3 Influence of Recovery Coefficient on Energy Dissipation Characteristics Under Different Loads
4 Experiment Verification
4.1 Measurement of Recovery Coefficient
4.2 Experiment of Dampers' Energy Dissipation Characteristics
5 Conclusion
Acknowledgments
References
16 Algorithms and Capabilities of Solidity to Simulate Interactions and Packing of Complex Shapes
Abstract
1 Introduction
2 Mathematical Models
2.1 Governing Equations
2.2 Contact Force
2.3 Code Optimisation and Parallelisation
3 Results and Discussions
3.1 Simulation Setup
3.2 Packing Density
3.3 Contact Forces
3.4 Coordination Number
3.5 Orientation of Unit Axes
4 Conclusions
Acknowledgments
References
17 Particle Shape Consideration in DEM Triaxial Test Simulations
Abstract
1 Introduction
2 Modeling of Real Particle Shape
3 Test Results
4 Conclusion
References
18 Study on the Microscopic Structure and the Bearing Capacity of the Elliptical Granular System in the Random Particle Size
Abstract
1 Introduction
2 Numerical Test of Shear Loading
3 Cyclic Loading Simulation
4 The Relationship Between Maximum Vertical Boundary Constraint Force and Friction Coefficient
5 Variation Characteristics of Internal Force Chain Configuration and Shear Band in Granular System
6 Conclusion
References
19 Improving Estimates of Critical Time-Steps for Discrete Element Simulations
Abstract
1 Introduction
2 Natural System Frequency
2.1 Model Example
2.2 Comparison with Current Methodology
3 Discussion
Acknowledgments
References
20 Discussion on the Difference of the Grain Particle Parameters in Reality and DEM
Abstract
1 Introduction
2 Experimental and Simulation
2.1 Experimental
2.2 Simulation
3 Result and Discussion
4 Conclusions
References
21 Stochastic Discrete Element Modelling of Rough Particles
Abstract
1 Introduction
2 Contact Laws of Rough Spheres
2.1 The GW Model
2.2 Numerical Algorithms
2.3 Simplified Form When \sigma Is Small
3 Results and Discussion
3.1 Roughness Parameters
3.2 Curve Fitting and Empirical Formula
4 Conclusion
References
22 Sphere Packing Based on Geometric Algorithm Generation Method
Abstract
1 Introduction
2 Spheres Generation Method
2.1 Geometric Procedure
2.2 Limited by Periodic Boundary
2.3 Sphere Packing Generation Process
3 Packing Properties and Examples
3.1 Packing Properties
3.2 Periodic Boundary for Large Scale Packing
4 Conclusions
References
23 Verification of an Automated Work Flow for Discrete Element Material Parameter Calibration
Abstract
1 Introduction
2 Materials and Methods
2.1 Calibration Method
2.2 Numerical Experiments
Factors and Factor Levels
Experimental Plan
2.3 Reference Results for the Calibration Process
3 Results and Discussion
3.1 Reference Results
3.2 Calibration Process Results
General Findings
Remote Solution Sets from the Calibration Process
4 Conclusion and Outlook
Acknowledgments
References
24 The Influence of Rolling Resistance on Granular Responses Under Triaxial Loading Paths
Abstract
1 Introduction
2 DEM Simulations
2.1 Contact Model
2.2 Samples and Parameters
3 Results and Discussion
3.1 Triaxial Compression Loading Test
3.2 Proportional Strain Loading Test
4 Conclusion
References
25 An Investigation of Single Particle Crushing Tests on Irregular-Shaped Quartz Sand with DEM
Abstract
1 Introduction
2 Research Methodology
2.1 Generation of Realistic Particle Shapes
2.2 DEM Modelling of Crushing Tests for Single Particle
3 Simulation Results
3.1 Fracture Patterns
3.2 Influence of Particle Morphology on Particle Strength
4 Conclusion
Acknowledgments
References
26 The Influence of Rotational Resistance on Critical State of Granular Materials
Abstract
1 Introduction
2 Method
2.1 Rotational Resistance
2.2 DEM Simulation
3 Results and Discussion
3.1 Macroscale Response
3.2 Particle-Scale Analysis
4 Conclusions
References
27 A New Method for the Generation of Polydisperse DEM Specimens
Abstract
1 Introduction
2 The Specimen Generation Based on the PDF
2.1 The PDF of Particle Size Distribution
2.2 Specimen Generation Procedure
2.3 Specimen Generation Example
3 Results and Discussion
4 Conclusion
References
28 Influence of Particle Shape on Mechanical Behavior of Granular Materials
Abstract
1 Introduction
2 Modeling Method of Particle Shape
3 Biaxial Compression Simulation Tests
3.1 Generation of Samples
3.2 Results and Discussions
4 Conclusions
Acknowledgments
References
29 The Influence of Particles' Aspect Ratio on the Shear Behaviour of Granular Materials
Abstract
1 Introduction
2 DEM Model and Particle Characteristics
2.1 DEM Model
2.2 Particle Characteristics
3 Numerical Samples
4 Overall Macroscopic Behaviour
5 Microscopic Observations
6 Conclusions
Acknowledgments
References
DEM-FEM Modelling of Granular Materials
30 Advances in Multiscale FEM-DEM Modeling of Granular Materials
Abstract
1 The Second-Order Computational Homogenization Method and Mixed FEM-Crushable DEM Nested Scheme
2 Crushable Discrete Element Model and Crushing Criteria of Individual Particle
2.1 Fracture Mode-Arrangements of Post-crushing Fragments
3 The Meso-Mechanically Informed Characterization of Macroscopic Damage-Healing and Plasticity
4 The Meso-Hydro-Mechanically Informed Effective Stress in Saturated Granular Materials
5 The Meso-Hydro-Mechanically Informed Generalized Effective Stress in Saturated Granular Materials
6 The Meso-Hydro-Mechanically Informed Effective Stress and Effective Pressure in Unsaturated Granular Materials
7 Numerical Examples
8 Concluding Remarks
References
31 Modeling the Particle Breakage by Using Combined DEM and SBFEM
Abstract
1 Introduction
2 The Combined DEM/SBFEM
3 Particle Breakage Criterions
4 Validation Benchmark
5 Conclusions
Acknowledgments
References
32 Numerical Simulations of the Interactions Between a Pneumatic Tire and Granular Sand by 3D DEM-FEM
Abstract
1 Introduction
2 Basic Formulations
2.1 Interactions Between Two Discrete Elements
2.2 Interactions Between a Discrete Element and a Finite Element
3 Contact Algorithm
3.1 Global Search Process
3.2 Local Search Process
4 Process of Modeling
4.1 The Model of the Tire
4.2 The Model of the Granular Sand
5 Numerical Simulation
5.1 DEM-FEM Analysis of Traveling Performance
5.2 Simulation Process
5.3 Results and Discussion
6 Conclusions
References
33 Combined Finite-Discrete Element Method Modeling of Rock Failure Problems
Abstract
1 Introduction
2 Combined Finite-Discrete Element Method
3 Rockslide Modeling
4 Hydraulic Fracturing Modeling
5 Conclusions
References
34 A New Finite Discrete Element Approach for Heat Transfer in Complex Shaped Multi Bodied Contact Problems
Abstract
1 Introduction
2 FEM Heat Conduction and Contact Transfer Equations
2.1 Problem Formulation (This Section Presents Modified Equations from [19])
2.2 Finite Element Discretisation
2.3 Thermal Contact
3 A New Contact Heat Transfer Method
3.1 Contact Surface Area
3.2 Computation of Heat Fluxes
3.3 Algorithm Limitations and Further Developments
4 FEM and Contact Conduction Validation
4.1 Analytical Solution
4.2 Perfect Contact Validation
5 Validation Against the Pipe-Network Model
5.1 Pipe-Network Model Description
5.2 Model Adjustment
5.3 Simulation Set-Up
6 Conclusions
References
35 Numerical Simulation of In-Plane Loaded Unreinforced Masonry Walls Based on Homogenized Discrete Element Model
Abstract
1 Introduction
2 Numerical Model
2.1 Discretization
2.2 Basic Equations
2.3 Solution Procedure
2.4 Simulation Parameters
Specimen Information
Material Properties
Mesh of the Walls
3 Simulation Results
3.1 Simulation of In-Plane Loading Tests
3.2 Parameter Study
Compressive Ratio
Height-Width Ratio
4 Conclusions and Expectation
Acknowledgments
References
36 Study on Micro-Mechanism of Concrete Hydraulic Fracturing Using DEM
Abstract
1 Introduction
2 Modeling of Concrete Based on DEM
2.1 Bonded-Particle Model for Concrete
2.2 Preparation of Concrete Sample
2.3 Calibration Results
3 Fluid-Solid Coupling Model
3.1 The Fluid-Solid Coupling Theory
3.2 Fluid Parameters
3.3 Boundary Condition for Fluid Calculation
4 Hydraulic Fracturing Test and Results
4.1 Hydraulic Fracturing Test
4.2 Results and Discussion
5 Conclusions
Acknowledgments
References
37 Finite-Discrete Element Analysis of Interface Shear Damage to HDPE Geomembrane in Contact with Gravel Drainage Layer
Abstract
1 Introduction
2 Experimental Study
3 Coupled Finite-Discrete Element Framework
4 Model Generation
5 Result and Discussion
5.1 Shear Stress-Displacement Relationship
5.2 Response of the Geomembrane
Acknowledgments
References
38 Simulation of Particle Dampers Using the Combined Finite-Discrete Element Method-A Simple Case
Abstract
1 Introduction
2 Particle-Wall Impact
3 Particle-Particle Impact
4 Numerical Example
5 Conclusions
References
39 Investigation on the Integrity of Cement Annulus During Multi-stage Horizontal Fracturing with FEM/DEM
Abstract
1 Introduction
2 The Unification of the Micro and Macro Parameters
3 Transformation from Finite Element to Discrete Element
4 Investigation of Complex Factors on the Integrity of Cement Annulus with FEM/DEM
5 Summary and Conclusions
References
40 Evaluation of DEM and FEM/DEM in Modeling the Fracture Process of Glass Under Hard-Body Impact
Abstract
1 Introduction
2 Overview of Simulation Conditions
2.1 Model Employed for Glass Fracturing Analysis
DEM
FEM/DEM
2.2 General Conditions and Material Parameters Used in Numerical Models
3 Fracture Response with Parametric Study for 2D Problem
3.1 Case 1: Projectile Radius
Case 1 (Crack Pattern)
3.2 Case 2: Projectile Velocity
Case 2 (Crack Pattern and Geometry)
Case 2 (Impact Fracturing Response)
4 Conclusion
References
41 Multiscale Modeling of Granular Assemblies Based on Different Micromechanical Strain
Abstract
1 Introduction
2 Multiscale Modeling Framework
2.1 Multiscale Solution Procedure
2.2 Homogenisation in DEM
3 Microstructural Strains in Multiscale Framework
3.1 Strain Definitions
3.2 Strain Accuracy
4 Simulation and Results
5 Conclusion
References
42 Simulation and Characterisation of Packed Columns for Cylindrical Catalyst Supports and Other Complex-Shaped Bodies
Abstract
1 Introduction
2 Numerical Simulations
2.1 Model Definition
2.2 Post-processing
Axial and Radial Packing Density Profile
Vertical Orientation Distribution and Stereographic Projection
3 Results
4 Conclusions
Acknowledgments
References
Contact, Bonding and Constitutive Modeling
43 A Gradient Model for Granular Materials Based on Thermo-micromechanics
Abstract
1 Introduction
2 Definition of Strain
3 Constitutive Model
4 Numerical Examples
4.1 Regular Arrangement
The High-Order Terms Effect for the Regular Arrangement
The Particle Rolling Effect for the Regular Arrangement
4.2 Quantitative Analysis for the Stress-Strain Relation
5 Conclusions
References
44 Role of DEM in Assessment of Continuum Equations for Solid-Solid Drag Force with Various Particle Size Ratios
Abstract
1 Introduction
2 Methods and Formulations
3 Results and Discussions
4 Conclusions
References
45 Elasticity and Mechanical Response of a Composite Particle System Induced by a Vertical Loading
Abstract
1 Introduction
2 Simulation Approach
3 Results and Discussions
4 Conclusions
Acknowledgments
References
46 Heavy Impact Compaction Modeling and Analysis on Unbound Paving Mixtures
Abstract
1 Introduction
2 Discrete Element Modelling for Unbound Paving Mixture
2.1 Aggregates Generation with Realistic Shapes
2.2 Gravity Accumulation and Impaction
3 Aggregates Contacts Analysis
4 Aggregates Stress Analysis
5 Summary and Conclusions
Acknowledgements
References
47 A Simple Multiscale Model for Granular Soils with Geosynthetic Inclusion
Abstract
1 Introduction
2 Formulation and Coupling Strategies
3 Numerical Examples of Soil-Geosynthetic Interaction
4 Global Responses
5 Local Responses
6 Conclusion
References
48 A Novel Rock Contact Model Considering Water-Softening and Chemical Weathering Effects
Abstract
1 Introduction
2 DEM Modeling of Composite Bonding
3 The Import of the Water Softening and the Chemical Weathering Factor
3.1 Water Softening Factor
3.2 Chemical Weathering Factor
4 The Composite Bond Model
4.1 Normal Contact
Compressive Force
Tensile Force
4.2 Shear Contact
4.3 Torsion Contact
5 Conclusion
Acknowledgments
References
49 Investigation of Contact Parameters of DEM Model in Flow Process
Abstract
1 Introduction
2 Discrete Element Method
3 Measurement of Parameters
3.1 Material Property Parameters
3.2 Contact Model Parameters
4 Validation Test
4.1 Rectangular Box Flow Test
4.2 Rotating Drum Flow Test
5 Conclusions
References
50 On the Stress-Force-Fabric Relationship in Anisotropic Granular Materials
Abstract
1 Introduction
2 Brief Review
3 Simulations
4 Results
5 Conclusion
References
51 Influences of Stiffness Ratio, Friction Coefficient and Strength Ratio on the Macro Behavior of Cemented Sand Based on DEM
Abstract
1 Introduction
2 Micro Parameters of a Contact Bond Model
3 Macro Properties of UCT Specimens and DEM Simulation
4 Effects of Contact Stiffness Ratio Ks/Kn
5 Effects of Friction Coefficient µ
6 Effects of Bond Strength Ratio
7 Conclusions
Acknowledgments
References
52 A 3D Mesoscopic Model for Simulating Failure Process of Concrete Based on Discrete Element Method
Abstract
1 Introduction
2 Concrete Model in Meso-Scale
2.1 Geometrical Model
Distribution of Aggregates
Mesh Generation
2.2 Mechanical Model
Force-Displacement Laws for Springs
Fracture Criterion of Springs
Contact Between Elements
Simulation Algorithm
3 Determination of Mechanical Parameters of the Model
3.1 Compressive Strength for Mortar Elements
3.2 Tensile Strength for Mortar Elements
3.3 Elastic Moduli and Poisson's Ratio for Elements
4 Validation of the Model and Discussion
4.1 Simulation of Mortar Tensile Behavior
4.2 Simulation of Concrete Tensile Behavior
5 Conclusions
Acknowledgments
References
53 DEM Simulation of Random Loose Packings of Micron-Sized Particles with Both Adhesion and Friction
Abstract
1 Introduction
2 Models and Methods
2.1 Computational Method: Adhesive DEM
2.2 Simulation Conditions
3 Results and Discussions
3.1 Packing Density and Coordination Number
3.2 Force Distribution
4 Conclusions
References
54 Preliminary DEM Analysis on Micro-Mechanical Behavior of the Composite Cemented Granules Under Complex Stress Conditions
Abstract
1 Introduction
2 DEM Simulation of Composite-Bond Granules System
2.1 Idealization of Composite-Bond Granules System
2.2 Microscopic Size of the Composite-Bond Grain System
2.3 Sample Preparation
2.4 Test Program
3 Simulation Results
3.1 Compression Test
3.2 Tension Test
3.3 Combined Compression and Shear Test
3.4 Combined Compression and Torsion Test
4 Conclusion
Acknowledgments
References
DEM Related Methods
55 CFD-DEM Simulation of Flocculation and Sedimentation of Cohesive Fine Particles
Abstract
1 Introduction
2 Mathematical Formulation
3 Results and Discussion
4 Conclusion
Acknowledgments
References
56 Elasticity Constants of Clay Minerals Using Molecular Mechanics Simulations
Abstract
1 Introduction
2 Foundation of Molecular Mechanics Simulation
2.1 Foundation of Molecular Mechanics
2.2 Selection of Force Fields
3 Computations of Elasticity Parameters of Clay Minerals
3.1 Establishment of Unit Cell
3.2 Establishment of Super Cell
3.3 Computations of Elasticity Constants
4 Main Factors Influencing Elasticity of Clay Minerals
4.1 Substitution
4.2 Structural Water
4.3 Anisotropy
5 Conclusions
Acknowledgments
References
57 A Comparative Study of Three Classes of Boundary Treatment Schemes for Coupled LBM/DEM Simulations
Abstract
1 Introduction
2 The Lattice Boltzmann Method for Fluid Flow
3 Schemes for the Treatment of Complex Boundaries
3.1 Bounce-Back and Interpolated Bounce-Back Schemes
3.2 Partially Saturated Computational-Lattice Boltzmann Method
3.3 Immersed Boundary Method-Lattice Boltzmann Method
4 Numerical Results and Discussions
4.1 Flow Past a Stationary Circular Cylinder
4.2 Sedimentation of Single Circular Particle
5 Conclusions
References
58 Application of the Method of Peridynamics to the Simulation of Hydraulic Fracturing Process
Abstract
1 Introduction
2 Basic of Peridynamics
2.1 Continuous Model
2.2 Fracture Model
3 Peridynamics for Hydraulic Fracturing and Its Implementation
4 Numerical Examples
4.1 Effect of Initial Cracks
4.2 Effect of the Distance Between Initial Cracks
5 Conclusion
References
59 Application of the Coupled Discrete Element Modelling and Modelica Based Multi-body Dynamics in System-Level Modelling
Abstract
1 Introduction
2 Multi-body Dynamics
2.1 Multi-body Dynamics in OpenModelica
3 Coupling Methodology
4 Case Study-Sand Agitation with a Pneumatic Motor
4.1 Experimental Results
4.2 DEM-MBD Modelling
5 Conclusion
References
60 Equilibrium Distribution Functions in Entropic Lattice Boltzmann Method
Abstract
1 Introduction
2 Equilibrium Distribution Functions in ELBM
3 Simulation Results
4 Discussion and Conclusion
References
61 Parametric Sensitivity Study of Particle Shape Effect Through 3D Printing
Abstract
1 Introduction
2 Particle Specimen Development
3 Triaxial Compression Test
4 Concluding Remarks
Acknowledgments
References
62 Study on the Multi-sphere Method Modeling the 3D Particle Morphology in DEM
Abstract
1 Introduction
2 Methodology
2.1 \mu CT Data and Multi-sphere Clump Generation
2.2 Monte Carlo Based Clump Processing Method
2.3 Deviation Analysis
3 Conclusion
References
63 An Upgraded CFD-DEM Investigation on the Liquefaction Mechanism of Sand Under Cyclic Loads
Abstract
1 Introduction
2 The Magnus Force
3 The CFD-DEM Scheme
3.1 Governing Equations for Fluid
3.2 The Contact Model
4 Simulation Procedure and Test Results
4.1 Simulation Procedure
4.2 Test Results
Velocity Field
Force Chains
5 Conclusions
Acknowledgments
References
64 Controlling the Flow Structure in Fluidized Bed: A CFD-DEM Approach
Abstract
1 Introduction
2 Computational Methods
3 Results and Discussion
4 Conclusion
Acknowledgments
References
Granular Flow
65 The Effect of Powder Flowability in the Selective Laser Sintering Process
Abstract
1 Introduction
2 DEM Model
3 Result and Discussion
4 Conclusion
References
66 A DEM Analysis of Particle Climbing in a Vibrating Pipe
Abstract
1 Introduction
2 Computational Model
3 Results and Discussion
3.1 Evolution of Particle Climbing Height
3.2 Motion of Tracers During Steady Climbing
3.3 Effect of Void Filling
4 Conclusion
Acknowledgments
References
67 Influence of Inclined Angles on the Stability of Inclined Granular Flows Down Rough Bottoms
Abstract
1 Introduction
2 Methods
3 Results and Discussions
3.1 No Flows and Gas Flows
3.2 Steady Ordered Flows
3.3 Steady Disordered Flows
3.4 Oscillation Flows
4 Conclusion
Acknowledgments
References
68 DEM Simulation of Particle Flow in a Parallel-Hopper Bell-Less Blast Furnace Charging Model
Abstract
1 Introduction
2 Methodology
2.1 Physical Model
2.2 DEM Model
2.3 Simulation Conditions
3 Results and Discussion
3.1 Model Validity
3.2 Discharging Flow Pattern in the Parallel Hopper
4 Conclusions
Acknowledgement
References
69 Basal Effect in Mono- and Bi-disperse Chute Flows
Abstract
1 Background
2 Discrete Element Modelling
3 Results
3.1 Evolution of Kinematic Properties
3.2 Velocity Profile in Steady State
4 Other Parameters
4.1 Sample Size
4.2 Contact Properties
5 Conclusion
Acknowlegments
References
70 LBDEMcoupling: Open-Source Power for Fluid-Particle Systems
Abstract
1 Introduction
2 Computational Methods
3 Validation and Performance
3.1 Validation
3.2 Performance
4 Application: Onset of Sediment Transport in Open Channel Flow
4.1 Setup
5 Results and Discussion
6 Conclusions and Outlook
References
71 Numerical Simulation of the Particular Flow on an Agricultural Screen with a Complex Motion Based on the Coupling Model of PMBK with DEM
Abstract
1 Introduction
2 Model and Method
2.1 Discrete Element Method
2.2 Planar Multi-Body Kinematics
3 Simulation Conditions
4 Results and Discussion
4.1 Comparison of Experimental Results and the Simulated Ones
4.2 Particle Flow on the Screen
5 Conclusions
References
72 Study on Drag Force Coefficients in Modeling Granular Flows in a Slot-Rectangular Spouted Bed
Abstract
1 Introduction
2 Numerical Models
2.1 Geometry of Spouted Bed
2.2 Governing Equations of Gas
2.3 DEM Models of Particle Motions
3 Drag Force Coefficient
3.1 Tensor Property of ß
3.2 Some Kinds of ß
3.3 Comparing Different ß
4 Conclusions
References
73 The Development of a Simplified System for Measuring the Passage of Particles on and Through Moving Screen Surfaces Using DEM
Abstract
1 Introduction
2 Rheology of Binary Mixtures
2.1 Governing Equations
2.2 Screening Modelling
3 Discrete Element Modelling (DEM)
3.1 Computer Simulations and Analysis
3.2 Conditions of the Simulation
4 Constitutive Models and Solution
5 Conclusion
Acknowledgments
References
DEM in Soil Mechanics
74 Analysis of Strength Characteristics for Granular Materials Based on Discrete Element Simulation
Abstract
1 Introduction
2 DEM Model of True Triaxial Test
3 Analysis of Friction Angle and Peak Stress Ratio
3.1 Peak Friction Angle
3.2 Peak Stress Ratio
4 Analysis of Relationship Among Fabric-Stress-Strength
4.1 Mathematical Description of Fabric in Granular Materials
4.2 Analysis of Fabric Ratio and "True Stress"
5 Conclusions
References
75 On the Use of the Uniaxial Shear Test for DEM Calibration
Abstract
1 Introduction
2 Linear Cohesion Contact Model
3 Uniaxial Shear Test
4 Simulation Results
5 Concluding Remarks
References
76 Investigation on the Rate-Dependent Behavior of Sands via DEM
Abstract
1 Introduction
2 Validation of the DEM Model
3 Numerical Configurations
4 Results and Discussions
4.1 Loose Sample
4.2 Dense Sample
4.3 Rate-Dependent Behaviour
5 Conclusions
Acknowledgments
References
77 DEM Analysis of Inclined Cone Penetration Test in Structured Sand Ground
Abstract
1 Introduction
2 Bond Contact Model and Structured Sand Ground Preparation
2.1 Bond Contact Model
2.2 Preparation of Structured Sand Ground
3 Results of Inclined CPT in Structured Soil Ground
3.1 The Evolution of Tip Resistance During Penetration Process
3.2 The Evolution of Bond Breakage During Penetration Process
4 Conclusion
Acknowledgments
References
78 Exploring the Undrained Cyclic Behaviour of Sand Using DEM
Abstract
1 Introduction
2 DEM Simulations
3 Simulation Results and Discussion
3.1 Effects of Confining Pressure
Stress-Strain Responses
Coordination Number and Fabric Anisotropy
3.2 Effects of Cyclic Deviatoric Stress
Stress-Strain Responses
Coordination Number and Fabric Anisotropy
4 Conclusion
Acknowledgments
References
79 Effect of Particle Shape on the Formation of Sandpile
Abstract
1 Introduction
2 Numerical Implementation
3 Results and Discussions
3.1 Effect of Particle Shape on the Angle of Repose
3.2 Micromechanical Analysis
4 Conclusions
Acknowledgments
References
80 Influence of Inherent Anisotropy on the Soil Behavior in Simple Shear Tests Using DEM
Abstract
1 Introduction
2 DEM Simulation
2.1 Sample Preparation
2.2 Consolidation and Shearing
2.3 Measurement
3 Simulation Results
3.1 Macro Results
3.2 Micro Results
4 Conclusions
Acknowledgments
References
81 Influence of Rigid and Flexible Top Boundaries on Geogrid Pullout Behavior Using DEM
Abstract
1 Introduction
2 Experimental Background
3 Numerical Modeling
4 DEM Simulation Results and Analyses
4.1 Pullout Force-Clamp Displacement Relations
4.2 Force Distributions Along the Geogrid and in the Specimen
5 Conclusions and Discussion
Acknowledgments
References
82 DEM Analysis of Cone Penetration Tests in Pure and Structured Sand Grounds
Abstract
1 Introduction
2 DEM Modelling of CPTs
2.1 Bond Contact Model
2.2 Preparation of Pure and Structured Sand Grounds
3 Results of CPTs in Pure and Structured Sand Grounds
3.1 The Evolution of Tip Resistances
3.2 Velocity Fields
3.3 Bond Breakage in Structured Sand Ground
4 Concluding Remarks
Acknowledgments
References
83 Discrete Element Simulation of the Direct Shear Test of Sandy Soil
Abstract
1 Introduction
2 Experimental Procedure of Direct Shear Test
3 Numerical Model and Methodology
4 Result and Discussion
4.1 Particle Motion and Formation of Shear Plane
4.2 The Influence of Shear Box Shape
4.3 Volumetric Strain and Porosity Change
4.4 The Influence of Some Parameters on Shear Behavior
5 Conclusions
Acknowledgments
References
84 Micromechanical Simulation of Fines Content Effect of Soils Using the Discrete Element Method
Abstract
1 Introduction
2 Model Setup and Simulation Control
3 Simulations and Discussion
4 Conclusion
References
85 Simulation of Sand-Tire Mixture by Discrete Element Method
Abstract
1 Introduction
2 Discrete Element Simulation
2.1 Particle Generation
Tire Particle
Sand Particle
2.2 Triaxial Test Simulation
3 Results
4 Conclusion
References
86 Effect of Different Temperatures and Pore Pressures on Geomechanical Properties of Pore-Filling Type of Methane Hydrate Soils Based on the DEM Simulations
Abstract
1 Introduction
2 Numerical Simulation
3 Numerical Results
3.1 Effect of Pore Pressure
3.2 Effect of Temperatures
3.3 Macro-Micro Relationship
4 Conclusions
Acknowledgments
References
87 Discrete Element Analysis of the Fabric Evolution of Granular Soils During Cyclic Loading
Abstract
1 Introduction
2 DEM Modeling
2.1 Contact Model
2.2 Specimen Generation
2.3 Cyclic Triaxial Test Simulation
3 Simulation Results and Analysis
4 Conclusions
Acknowledgments
References
88 DEM Simulation of Dynamic Compaction with Different Tamping Energy and Calibrated Damping Parameters
Abstract
1 Introduction
2 DEM Simulations
2.1 Contact Model
2.2 Granular Ground
3 Simulation Results
3.1 Viscous Damping Calibration
3.2 Different Tamping Energy
4 Conclusions
Acknowledgments
References
DEM in Rock Mechanics
89 Discrete Simulation of Fracturing and Failure of Rock Samples
Abstract
1 Introduction
2 Applied Methodology for Discrete Element Simulations of Fractures
3 Discussion of Examples
3.1 Fracturing Around a Single Natural Fracture Under Brazilian Test Conditions
3.2 Fracturing of Layered Rock Under Brazilian Test Conditions
3.3 Fracturing Around Soft Inclusions Under Uniaxial Loading Conditions
4 Conclusions
References
90 A New Rock Slicing Algorithm with Reduced Data Structure for Discrete Element Method Analyses for Rock Mechanics
Abstract
1 Introduction
2 The New Rock Slicing Method
3 Applications to Rock Mechanics
3.1 Tunnelling in Jointed Rock Masses
3.2 2D and 3D Slope Stability Analyses of Jointed Rock Masses
4 Conclusions
References
91 Meso-Structure Parameters of Discrete Element Method of Sand Pebble Surrounding Rock Particles in Different Dense Degrees
Abstract
1 Introduction
2 Research Method
2.1 Large Triaxial Test
2.2 Digital Triaxial Test
3 Result Analysis
3.1 Analysis of Large-Scale Triaxial Test Results
3.2 Determination of Meso-Structure Parameter Value of Particle
4 Conclusions
Acknowledgments
References
92 Dimensions and Brittleness Effect on the Size of Process Zone in Rock-like Material Characterized by Bonded Particle Model
Abstract
1 Instruction
2 Numerical Model
3 Calibration
4 Numerical Results and Size Effect of Process Zone
5 Conclusions
References
93 Numerical Simulation of Resonant Column Tests on Jointed Rocks Using DEM
Abstract
1 Introduction
2 Resonant Column Tests
3 Numerical Simulation of Resonant Column Tests
3.1 Resonant Column Tests on Sample with Two Horizontal Joints
3.2 Resonant Frequency Curves Under Torsional and Flexural Vibrations
3.3 Transfer of Vibrations Across Joints
4 Conclusions
References
94 3D Numerical Modeling of Strength in Fractured Rock Mass
Abstract
1 Introduction and Background
2 Geometric Characteristics and Mechanical Properties of Intact Rock and Fracture Network
2.1 Discrete Fracture Network
2.2 Model Set up Based on Fracture Network
3 Numerical Methodology for Calculation of REV, Strength Parameters and Stress Dependency of Strength
3.1 Boundary Conditions for Estimating the Strength of Jointed Rock Mass
4 Calculation UCS of Rock Mass and Determination of REV
4.1 Determination of UCS of Rock Mass with Various (JKn/JKs)
5 Stress Dependence Rock Mass Strength to Confined Stresses Strength in Different Ratio of (JKn/JKs)
5.1 Evaluating Strength Parameters of Rock Mass Under Conventional Triaxial Loading Condition
5.2 Evaluating Strength Parameters of Rock Mass Under Extensional and True-Triaxial Loading Condition
6 Conclusion
References
95 DEM Modeling of Brittle Behavior of Rock Specimens with Two Infilled Flaws
Abstract
1 Introduction
2 Methodology
3 Results
3.1 Comparison of Mechanical Properties of Numerical Samples with Open and Infilled Flaws
3.2 Cracking Progress
3.3 Crack Coalescence
4 Conclusions
Acknowledgments
References
96 Three-Dimensional Discrete Element Model for Tri-axial Tests of Graded Stones Under Different Gradations
Abstract
1 Introduction
2 Discrete Element Modelling for Tri-axial Tests
3 Simulation of Virtual Tri-axial Tests
3.1 Stress Analysis
3.2 Strain Analysis
4 Summary and Conclusions
Acknowledgments
References
97 3D Discrete Element Model for TBM Cutter Breaking Rock and Dynamic Loads Analysis
Abstract
1 Introduction
2 3D DEM Model of TBM Cutter Breaking Rock
2.1 Rock Model Generation
2.2 Disc Cutter Modeling and Cutting Process Simulation
2.3 DEM Model Verification
3 Simulated Results Analysis
4 Conclusions
Acknowledgement
References
98 Calibration of Microscopic Mechanical Parameters of Granite Using Actual Distributions and Orthogonal Simulations
Abstract
1 Introduction
2 Determination of Actual Types and Positions
3 Orthogonal Simulations
3.1 Geometry of Particle Flow Simulation
3.2 Initial Micro Mechanical Parameters
3.3 Orthogonal Simulations
4 A Proposed Method to Determine Micro Parameters
4.1 Sensitivity Analysis of Macro-Micro Parameters
4.2 A Proposed Method
4.3 Examples
5 Summary
Acknowledgments
References
DEM in Chemical Engineering
99 CFD-DEM Simulation of a Conical Spouted Bed Operating with High Density Particles
Abstract
1 Introduction
2 CFD-DEM Model
3 Experimental
4 Result and Discussion
4.1 Model Validation
4.2 Solid Circulation in Spouted Bed
5 Conclusions
References
100 CFD-DEM Study the Effect of Carrier-Drug Mass Ratio on the Aerosolisation Process in Original and Modified Dry Powder Inhalers
Abstract
1 Introduction
2 Experimental and Numerical Model
2.1 Experimental Methods
2.2 Numerical Model
3 Result and Discussion
3.1 Experimental Results
3.2 Numerical Results
4 Conclusion
References
101 A Numerical Study of the Effect of Loading Profiles on Mixing/Segregation of Particles in the Truck Mixer via DEM
Abstract
1 Introduction
2 The Discrete Element Method
3 Results and Discussion
3.1 Model Set up
3.2 The Segregation/Mixing Morphology of Particles Under Different Loading Profiles During Mixing Process
3.3 The Quantization of Mixing/Segregation Degree During Mixing Process
4 Conclusions
References
102 From Micro to Macro: A Comparative Study of DEM and FEM in Modelling Hopper Flow
Abstract
1 Introduction
2 Numerical Methods
2.1 Direct Shear Test
2.2 DEM and FEM Model of Hopper
3 Results and Discussion
3.1 Model Validation
3.2 Effect of Particle Friction
4 Conclusions
Acknowledgments
References
103 Simulation of Multiphase Reactive Gas Transport Using Smoothed Particle Hydrodynamics
Abstract
1 Introduction
2 Model Description
3 Tests and Results
3.1 Homogenization Under Turbulent Mixing
3.2 Flow Analysis of SF6-H2-HF in a Heavy Electronic Machinery
4 Conclusion
Acknowledgments
References
104 DEM-CFD Modelling of Electrostatic Phenomena in Fluidization
Abstract
1 Introduction
2 Methodology
2.1 Contact Electrification Model
2.2 Electrostatic Interactions
2.3 DEM-CFD Model
3 Results and Discussion
4 Conclusions
References
105 Numerical Simulation of Gas-Solid Flow in a Wurster Fluidized Bed
Abstract
1 Introduction
2 CFD Models
3 Simulation Model
4 Results and Discussion
4.1 Influence of the Gas Velocity
4.2 Solid Volume Fraction Analysis
4.3 Velocity Analysis of Solid Phase
5 Conclusions
Acknowledgments
References
106 CFD Simulation of Hydrodynamics of Three-Dimensional Circulating Fluidized Beds with EMMS Model
Abstract
1 Introduction
2 Model
2.1 Governing Equations
2.2 Drag Model
2.3 Geometry
2.4 Simulation Settings
3 Results and Discussion
3.1 Distribution of Solids Volume Fraction
3.2 Pressure Distribution
3.3 Distribution of Solids Vertical Velocity
4 Conclusions
Acknowledgments
107 Investigation of Gas-Solid Flow Dynamics and Heat Transfer in Fluidized Beds by Using DEM-LES Coupling Approach
Abstract
1 Background
2 Mathematical Model
2.1 Gas Phase Motion
2.2 Solid Motion
3 Model Validation
4 Results and Discussion
4.1 Heat Transfer of the BFB with Various Tube Bundles
Simulation Setup
Gas-Solid Flow Patterns and Heat Transfer Properties
4.2 Hydrodynamics of the CFB with Six Cyclones
Simulation Setup
Gas-Solid Hydrodynamics
5 Conclusion
References
DEM in Geotechnical and Ocean Engineering
108 Investigating the Origin of the Soil Arch in the Trapdoor Problem: Photoelastic Measurement and Discrete Element Simulation
Abstract
1 Introduction
2 Photoelastic Physical Model Test
3 Discrete Element Analysis
4 Conclusions
References
109 Influence of Base Roughness on Kinematic and Mechanical Characteristics of Debris Flows
Abstract
1 Introduction
2 Numerical Simulation of Dry Granular Flows
3 Simulation Results and Discussion
3.1 Coordination Number and Flowing Body Length
3.2 Mechanical Effects of Particle Contacts
3.3 The Fabric Structure of Debris-Flow Deposits
4 Conclusions
References
110 Numerical Study on Seismic Isolation Effect of Gravel Cushion
Abstract
1 Background
2 Modelling Method
3 Macroscale Behaviors
4 Parametric and Mesoscale Analyses
4.1 Effect of Base Pressure
4.2 Effect of Cushion Thickness
4.3 Average Coordination Number of Particles
5 Conclusion
References
111 Interaction Between Floater and Sea Ice Simulated with Dilated Polyhedral DEM
Abstract
1 Introduction
2 Dilated Polyhedral Element
2.1 Minkowski Sum Theory
2.2 Voronoi Cell
3 Contact Model
3.1 Sphere to Sphere, Face and Cylinder Contacts
3.2 Cylinder to Cylinder and Face Contacts
3.3 Face to Face Contact
4 Simulation of Ice Load on Floater
5 Conclusions
References
112 Investigation into the Soil-Root Composites Using Distinct Element Method
Abstract
1 Introduction
2 Modelling of Direct Shear Tests on Rooted Soils
2.1 Model of Root
2.2 Simulation of Direct Shear Test
2.3 DEM Simulations of Rooted Soil
3 Conclusions
Acknowledgments
References
113 Macro and Micro Structural Characteristics of Force Chains in Overlaying Strata Above Top Caving Mining Face
Abstract
1 Introduction
2 Method of Photoelastic Experiment
3 Design of Experiment
4 Structural Characteristics of Force Chains in Strata Get by Photoelastic Experiment
5 Conclusion
References
114 DEM Analysis of Small-Displacement Earth Pressure Against a Rigid Retaining Wall with the Wall Moving Towards Structured Sand
Abstract
1 Introduction
2 DEM Modeling of Retaining Wall
2.1 Bond Contact Model
2.2 Ground Generation with Retaining Wall
3 Analysis of Simulation Results
3.1 Horizontal Earth Pressure Distribution
3.2 Distribution of Shear Strain
3.3 The Evolution of Bond Breakage
4 Conclusions
Acknowledgments
References
Powder Technology
115 Numerical Investigation of Optical Sorting Using the Discrete Element Method
Abstract
1 Introduction
2 Methodology
3 Numerical Setup and Simulation Parameters
4 Results and Discussion
4.1 Influence of Valve Parameters
4.2 Influence of Simulation Parameters
5 Conclusions
References
116 Dependence of Granular Materials Homogenization on Geometrical Aspects in Commonly Used Mixers via DEM
Abstract
1 Introduction
2 Mathematical Model and Mixer Descriptions
3 Results and Discussion
3.1 Horizontal Rotating Drum Mixer
3.2 Industrial Paddle Mixer
Acknowledgments
References
117 The Effect of Rotational Speed on Granular Dynamics and Homogenization in a Vertical Bladed Mixer
Abstract
1 Introduction
2 Parameters of Geometry, Material and Mathematical Model
3 Results and Discussion
3.1 Velocity Profiles
3.2 Homogenization and Concentration Patterns
4 Conclusions
Acknowledgments
References
118 DEM Modelling of Silo Loads Asymmetry Induced by Eccentric Discharge
Abstract
1 Introduction
2 DEM Simulation Setup
3 Results and Discussion
3.1 Symmetrical Filling and Discharge
3.2 Eccentric Discharge
Influence of Particle-Particle Friction Coefficient and Rolling Friction Coefficient
3.3 Influence of Outlet Eccentricity
4 Conclusions
References
119 Concurrent Adaptive Mass-Conserving Comminution of Granular Materials Using Rigid Elements
Abstract
1 Introduction
2 Spawning Method
2.1 Failure Criterion
2.2 Laguerre Voronoi Tessellation of the Domain
2.3 Generation and Arrangement of New Fragments
3 Examples and Results
3.1 Mass Loss and Number of Daughter Particles: Comparison with Other Existing Methods
3.2 Effect of the Size of the Daughter Particles
4 Conclusions
References
120 Understanding Size Segregation in Tumbling Mills
Abstract
1 Introduction
2 Materials and Methods
3 Results and Discussion
3.1 Segregation at Lower Milling Speeds
3.2 Segregation at Higher Milling Speeds
Initial Segregation
Differential Fall Positions
Physics and Governing Parameters
4 Conclusions
References
DEM in Mechanical Engineering
121 Modeling Roughness Effect of Joint Using Rough-Joint Model
Abstract
1 Introduction
2 Rough-Joint Model
3 Modified Calculation for DEM
4 Validation
4.1 Simulation of Direct Shear Test
4.2 Performances of Rough-Joint Model
4.3 Influence of Particle Size on Rough-Joint Model
5 Conclusions
References
122 DEM in Analyses of Nuclear Pebble Bed Reactors
Abstract
1 Introduction
2 Utilizing DEM in Reactor Core Calculations
2.1 Reactor Physics
2.2 Thermal Hydraulics
3 Pebble Flow Simulations
4 Insertion of a Control Blade into the Pebble Bed
5 Conclusions
Acknowledgments
References
123 Modified Modeling of Self-twist Process of Multistage Cable Based on Discrete Element Method
Abstract
1 Introduction
2 Modeling Process of Multi-stage Twisting Cable
3 Comparison of the Mechanical Properties Predicted by Self-twist Model and Space Theory
4 Conclusions
References
124 DEM Analysis of Interaction Between Granular Materials and a Cutting Blade
Abstract
1 Introduction
2 Calculation Method
2.1 Discrete Element Method
2.2 Rolling Resistance Model
2.3 Calculation Condition
3 Results and Discussion
3.1 Particle Behavior
3.2 Force Acting on Blade
3.3 Relationship Between Fluctuation of Force and Development of Shear Band
4 Conclusions
References
125 DEM Simulation of Rubble Ice Accumulation in Front of Water Intake Area of Nuclear Power Plant
Abstract
1 Introduction
2 Discrete Element Method for Ice Accumulation Simulation
3 Simulation Calculation Parameters of Ice Accumulation in Water Intake Area of Power Plant
3.1 DEM Simulation of Ice Accumulation in Front of Water Intake
4 Results and Discussion
4.1 Influences of Sea Ice Concentration
4.2 Influences of Ice Velocity
4.3 Influence of the Average Size of Rubble Ice
5 Conclusions
Acknowledgments
References
126 Optimizing Heavy Equipment for Handling Bulk Materials with Adams-EDEM Co-simulation
Abstract
1 Introduction
2 Simulation-Based Design of Heavy Equipment
2.1 Traditional Approaches
2.2 Introducing EDEM
3 EDEM-Adams Co-simulation
4 Industrial Applications
4.1 Mining: VR Steel Dragline Bucket Design
5 Conclusion
DEM in Agricultural Engineering
127 Nonlinear Dynamic Process of Soil Tillage Under Straw Mulching Model
Abstract
1 Introduction
2 Soil-Failure Transforming Constitutive Equation in Tillage
3 Simulation Test of Soil Tillage
3.1 Simulation Test of Cohesive Soil Tillage with Weeds
3.2 Nonlinear Dynamic Test of Soil Tillage with Straws
4 Conclusion
Acknowledgments
References
128 Study of Connection Mechanics Model and Mechanical Properties of Corn Kernel Carpopodium Based on DEM
Abstract
1 Introduction
2 Materials and Methods
2.1 Test Samples and Equipment
2.2 Test Principle and Method
Transverse Compressive Force Test
Transverse Tensile, Longitudinal and Tangential Shear Force Test
2.3 Connection Mechanics Model and Failure Criterion
Connection Mechanics Model
Threshing Failure Criterion
3 Test Result and Analysis
4 Conclusion
References
129 The DEM-Based Digital Design Platform for Agricultural Machinery-AgriDEM
Abstract
1 Introduction
2 The Design Architecture of AgriDEM
3 Implementation Methods of the Key Technologies
3.1 Boundary Modeling
3.2 Particle Modeling
3.3 Model of Calculation
4 Development of Prototype System
5 Test and Simulation Analysis
6 Conclusion
References
130 Study on Screening Efficiency of Banana Vibrating Screen Based on 3D DEM Simulation
Abstract
1 Introduction
2 The Analysis of Screening and Model of Particulate Contacts
2.1 The Analysis of Screening
2.2 Model of Particulate Contacts
3 Numerical Simulation and Analysis
3.1 Set the Simulation Parameters
3.2 The Experimental Design and Results
3.3 Analysis of Test Results
4 Conclusion
References
131 Determination and Analysis for Parameters of Shape, Size, Physical and Mechanical Properties of Soybean Grains
Abstract
1 Introduction
2 Materials and Methods
3 Results and Discussion
4 Conclusions
References
132 Investigation of the Shape, Dimensions and DEM Modeling Method of Maize Grains
Abstract
1 Introduction
2 Analysis of the Geometric Shape and Dimensions of Maize Grain and Modeling Method of Grain Group
3 Modeling Method of Single Maize Grain
4 Analysis and Validation of Modeling Method
4.1 Experimental Investigation
4.2 Simulation Analysis
4.3 Comparison of Simulation and Experimental Results
5 Conclusions
References
DEM in Transport Engineering
133 Material Transport Study into a SAG Mill by DEM Impact on the Inclination of Lifter
Abstract
1 The Problem
2 Modeling the Problem
2.1 Geometrical Model
2.2 DEM Model
3 Presentation and Analysis of the Results
4 Conclusions
Acknowledgments
References
134 Numerical Simulation of the Interaction between the Grousers of Tracked Vehicle and the Soil Using Discrete Element Method
Abstract
1 Introduction
2 Material and Methods
2.1 Basic Parameters of the Particles and the Geometry
2.2 Mechanical Model of the Interaction between the Track Shoe and the Soil Particles
3 Results and Discussion
3.1 Comparison of the Traction Force
3.2 Effects of the Grouser Height and Spacing
3.3 Cutting Processes of the Soil Particles
3.4 Stress Analysis of the Track Shoe
4 Conclusion
References
135 Discharging Trajectory of the Bucket Wheel Stacker-Reclaimer Based on DEM
Abstract
1 Gravitational, Centrifugal, and Hybrid Discharging
1.1 Polar Distance and Rotation Speed
1.2 Calculation of the Discharging Trajectory
2 Gravitational Side Discharging
3 Trajectory of Gravitational Side Discharging
4 EDEM Simulations
5 Conclusions
References
136 DEM Analysis of Ballast Breakage Under Train Loads and Its Effect on Mechanical Behaviour of Railway Track
Abstract
1 Introduction
2 DEM Model of Railway Ballast
2.1 Bonded Particle Model Generation
2.2 Constitutive Laws
2.3 The DEM Model
3 Dynamic Train Loads
4 Dynamic Behaviour of Ballast Under Train Loads
4.1 Permanent Deformation
4.2 Broken Bonds and Particle Breakage
5 Conclusion
References
137 Simplified Multi-sphere Model-Based DEM Simulation of Particle Behavior in Hopper During Ship Loading for Dust Control
Abstract
1 Introduction
1.1 Ship Loading Spout and Wheat Kernel
1.2 DEM and Multi-sphere Method
2 Materials and Methods
2.1 Wheat Particle Model
2.2 Ship Loading Spout Model
2.3 Wheat Filling and Discharge Simulation
3 Results and Discussion
4 Conclusion
References
High Performance DEM Computing
138 GPU DEM Simulations and Experimental Studies of Ball Milling Process for Various Particle Shapes
Abstract
1 Introduction
2 Experimental Setup
2.1 Analogical Complex Granular Media
2.2 Milling Device and Optical Setup
3 Discrete Element Method
3.1 DEM GPU Approach: BLAZE-DEM Framework
3.2 Contact Law Model
4 Milling Modeling and Experimental Results
5 Conclusion
References
139 MercuryDPM: A Fast and Flexible Particle Solver Part A: Technical Advances
Abstract
1 Background
2 MercuryDPM: Fast, Flexible Particle Solver
3 Features
4 Advanced Analysis with MercuryCG
5 Interested in MercuryDPM?
Acknowledgments
References
140 Computing Framework of Large-Scale Dilated Polyhedral DEM Particles Simulation Based on GPU
Abstract
1 Introduction
2 Framework Structure
2.1 Core Components
2.2 Workflow
3 Design and Implementation of Framework
3.1 Design of Modules
3.2 Design of Interfaces
4 Framework Test
5 Conclusion
Acknowledgments
References
141 Computing with Non-convex Polyhedra on the GPU
Abstract
1 Introduction
2 Particles
3 Convex Polyhedra
3.1 Polyhedral Decomposition into Tetrahedra
4 Non-convex Polyhedra
4.1 Combinatorial Approach
4.2 Decomposition Approach
5 Experimental Validation
6 Conclusion
References
142 Industrial Scale Particle Simulations on the GPU Using the Blaze-DEM Code
Abstract
1 Introduction
1.1 DEM
1.2 Computational Implementation
2 Overview Blaze-DEM Algorithms
2.1 Contact Detection
3 Simulations Using Blaze-DEM
4 Conclusion
References
143 Simulation of Heat Transfer in Granular Systems with DEM on GPUs
Abstract
1 Introduction
2 Physical Model and Implementation
3 Physical and Scalability Tests
4 Discussion and Conclusion
Acknowledgments
References
144 Analysis on Motion Behavior of Spherical Shell in a Periodical Shear Flow Based on CUDA Parallel Computing Technique
Abstract
1 Introduction
2 DEM Algorithm for Spherical Shell Movement in Annular Boundary
3 DEM Algorithm for Spherical Shell Movement in Sectorial Periodic Boundary
4 Numerical Examples
5 Conclusions
References
DEM Related Experimental Studies
145 Photoelastic Experiments on Force Chain Evolution in Granular Materials under Bilateral Flowing Conditions
Abstract
1 Introduction
2 Photoelastic Testing Apparatus
3 Force Chain Structure under Different Flow Directions
4 Force Chain Structure under Different Loading Directions
5 Conclusion
References
146 The Design and Development of the Granular Material Photoelastic Device with Multiway Loading
Abstract
1 Introduction
2 The Design Idea of the Granular Photoelastic Device
3 Application of Granular Photoelastic Equipment
3.1 Using Method of Photoelastic Equipment
3.2 Compression and Shear Test of the Granular Material Medium System
Test of Circular Granular with Different Size
Test of Elliptical Granular with Different Size
4 Verification Test of Photoelastic Equipment Effectiveness
5 Conclusion
References
147 Determination of Micro-parameters in DEM Through the Whole Surface Deformation Measurement in the Tri-axial Test
Abstract
1 Introduction
2 The Whole Surface Deformation Measurement
3 Description of DEM Models
4 Results of Laboratory Tests
5 Cross Effect of Sliding and Rolling Friction
6 Determination of the Micro-Properties of Fujian Standard Sand
7 Conclusion
References
148 Identification and Analysis of Force Chain Structures in Photoelastic Experiments
Abstract
1 Introduction
2 The Force Chain Evolution
3 The Force Chain Identification
4 Conclusion
Acknowledgments
References
149 Study of Shear Behavior of Homogeneous and Heterogeneous Granular Materials by Experimentation and Numerical Simulation of Triaxial Test
Abstract
1 Introduction
2 DEM Simulations
2.1 Contact Laws
2.2 Rigid Cylindrical Boundary Condition
3 Results and Discussion
3.1 Study of Mono-Disperses Granular Specimens
3.2 Study of Bi-disperses Mixture Specimens
4 Conclusions and Perspectives
References
150 Erratum to: Preliminary DEM Analysis on Micro-Mechanical Behavior of the Composite Cemented Granules Under Complex Stress Conditions
Erratum to:Chapter "Preliminary DEM Analysis on Micro-Mechanical Behavior of the Composite Cemented Granules Under Complex Stress Conditions" in: X. Li et al. (eds.), Proceedings of the 7th International Conference on Discrete Element Methods, Springer Proceedings in Physics 188,DOI 10.1007/978-981-10-1926-5_54

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