The document provides an introduction to the discrete element method (DEM). DEM is a numerical modeling method for simulating the motion and behavior of large assemblies of discrete particles. It works by computing the motion of individual particles based on Newton's laws of motion and models contact forces via spring and damping models. DEM has various applications in modeling granular materials, aggregates, and other particulate systems. It offers advantages over other methods for capturing the discrete nature of such materials.
Finite Element Analysis of Composites by Dan MilliganIulian J
Firehole Composites was recently invited to present at the 2012 Rocky Mountain SAMPE Fall Workshop. Dan Milligan from Firehole gave a presentation entitled "Finite Element Analysis of Composites".
Below is the abstract of the presentation:
Overview of topics that should be considered when using the finite element method to simulate the response of a laminated composite at the structural, component, or coupon level. Consequences of various choices will be discussed, and recommendations for best practices will be presented.
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Setting up the Best FEA Model
Moving from 2D to 3D Modeling
Composite Failure Theories
Progressive Failure
This document gives the class notes of Unit 3 Compound stresses. Subject: Mechanics of materials.
Syllabus contest is as per VTU, Belagavi, India.
Notes Compiled By: Hareesha N Gowda, Assistant Professor, DSCE, Bengaluru-78.
Finite Element Analysis of Composites by Dan MilliganIulian J
Firehole Composites was recently invited to present at the 2012 Rocky Mountain SAMPE Fall Workshop. Dan Milligan from Firehole gave a presentation entitled "Finite Element Analysis of Composites".
Below is the abstract of the presentation:
Overview of topics that should be considered when using the finite element method to simulate the response of a laminated composite at the structural, component, or coupon level. Consequences of various choices will be discussed, and recommendations for best practices will be presented.
Topics covered in the presentation include:
Setting up the Best FEA Model
Moving from 2D to 3D Modeling
Composite Failure Theories
Progressive Failure
This document gives the class notes of Unit 3 Compound stresses. Subject: Mechanics of materials.
Syllabus contest is as per VTU, Belagavi, India.
Notes Compiled By: Hareesha N Gowda, Assistant Professor, DSCE, Bengaluru-78.
CEM Workshop Lectures (5/11): Best Practices in RCS PredictionAbhishek Jain
Above lecture can be downloaded from www.zeusnumerix.com
Computational Electromagnetics Workshop Lecture 5 of 11. The lecture is designed such that it can be read independently. It covers the basics of electromagnetics, issues that can happen with the mesh, how to post-process the results and analysis. The general advice is given for setting up the simulation and use of boundary conditions.
Initial study and implementation of the convolutional Perfectly Matched Layer...Arthur Weglein
In this report, first steps and results of the implementation of the Convolutional Perfectly
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reflection coefficient at the interface between two PML media, with the analogous conditions
for the reflection coefficient at an interface between two acoustic media. A side product of the
present work for the M-OSRP is a code to create synthetic data, using Finite-Difference (FD)
methods with PML BCs.
We also provide a short description of the main stages involved in the original Reverse Time
Migration (RTM) algorithm, with focus on the 2D acoustic heterogeneous wave equation. We
include a derivation of the equations of the CPML for the backward propagation of the data,
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have not been reported in the literature. The reason we include the RTM is because the present
report can be considered part of a broader research project whose objective is to compare the
RTM with PML BCs with the Green’s theorem based RTM, developed within the M-OSRP.
Initial study and implementation of the convolutional Perfectly Matched Layer...Arthur Weglein
In this report, first steps and results of the implementation of the Convolutional Perfectly
Matched Layer (CPML), for the modeling of the 2D acoustic heterogeneous wave equation
are presented. We also compare the conditions to set to zero, for all angles of incidence, the
reflection coefficient at the interface between two PML media, with the analogous conditions
for the reflection coefficient at an interface between two acoustic media. A side product of the
present work for the M-OSRP is a code to create synthetic data, using Finite-Difference (FD)
methods with PML BCs.
We also provide a short description of the main stages involved in the original Reverse Time
Migration (RTM) algorithm, with focus on the 2D acoustic heterogeneous wave equation. We
include a derivation of the equations of the CPML for the backward propagation of the data,
which is part of the RTM. As far as the authors knowledge, these equations and derivations
have not been reported in the literature. The reason we include the RTM is because the present
report can be considered part of a broader research project whose objective is to compare the
RTM with PML BCs with the Green’s theorem based RTM, developed within the M-OSRP.
The distribution and_annihilation_of_dark_matter_around_black_holesSérgio Sacani
Uma nova simulação computacional feita pela NASA mostra que as partículas da matéria escura colidindo na extrema gravidade de um buraco negro pode produzir uma luz de raios-gamma forte e potencialmente observável. Detectando essa emissão forneceria aos astrônomos com uma nova ferramenta para entender tanto os buracos negros como a natureza da matéria escura, uma elusiva substância responsável pela maior parte da massa do universo que nem reflete, absorve ou emite luz.
A Numerical Method for Modelling Discontinuous Mechanics of Asphalt MixtureIDES Editor
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FINITE ELEMENT ANALYSIS OF RIGID PAVEMENT USING EVERFE2.24& COMPARISION OF RE...civej
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Stresses in rigid pavement at critical location was calculated due to combined effect of axle load and
environmental factor.These results are compared with IRC58-2015&2002.The disparity between results
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This study finds that stressesgiven by IRC58-2015 is up to 42% less than that given by IRC58-2002, and
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Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
Model Attribute Check Company Auto PropertyCeline George
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A Strategic Approach: GenAI in EducationPeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
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Personal development courses are widely available today, with each one promising life-changing outcomes. Tim Han’s Life Mastery Achievers (LMA) Course has drawn a lot of interest. In addition to offering my frank assessment of Success Insider’s LMA Course, this piece examines the course’s effects via a variety of Tim Han LMA course reviews and Success Insider comments.
Acetabularia Information For Class 9 .docxvaibhavrinwa19
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June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
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Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
Objective:
Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
2. INTRODUCTION
What is DEM?
The computation of the motion and effect of a large number of small particles
A simulation of discreet elements
https://www.youtube.com/watch?v=-j1lCCznSrU
1 9/13/2022 Discrete Element Method (DEM)
3. a way of simulating discrete matter
a numerical model capable of describing the mechanical behavior of
assemblies of discs and spheres
a particle-scale numerical method for modeling the bulk behavior of
granular materials and many geomaterials (coal, ores, soil, rocks,
aggregates)
capture dual nature of materials
CONT’D….
2
DEM
9/13/2022 Discrete Element Method (DEM)
4. 9/13/2022 Discrete Element Method (DEM)
CONT’D….
3
Discretization of Space!
Lagrangian (ex: DEM)
Discontinuous
Classical mechanics interaction (general)
Resolution at particle level
Computationally expensive
Eulerian (ex: FEM)
Continuous
Related stresses/stains via constitutive EQs
Resolution filled throughout grid
Computationally cheaper
Track position and velocity of moving particle Track velocity (or flux) at fixed grid locations
http://15462.courses.cs.cmu.edu/fall2018/lecture/pdes/
5. 9/13/2022 Discrete Element Method (DEM)
4
CONT’D….
What is unique about DEM?
Each particle has its own rotational, positional, radial, and momentum vectors that can be
calculated using simple Newtonian physics (Kong, 2019)
Simulation consists of three parts
Small timesteps must be used, as solution is only conditionally stable (O’Sullivan & Bray, 2004)
Ideal for modeling separate, discrete particle situations, like, Colloids, granular mater. Powder,
bulk materials in storage, progressive fracture and failure
Initialization Time Stepping
Post
processing
6. 9/13/2022 Discrete Element Method (DEM)
Industrial applications of DEM?
CONT’D….
Chemicals
Pharmaceuticals
Ceramics
Metals
Food
Agriculture
5
7. 9/13/2022 Discrete Element Method (DEM)
Modeling movement of individual particles
Micromechanical level of analysis
Coupled with FEM, CFD
Complex particle geometries and arrangements
Complicated validation process
Computationally expensive
Advantages and Disadvantages of DEM
CONT’D….
ADVANTAGES DISADVANTAGES
6
8. 9/13/2022 Discrete Element Method (DEM)
7
HISTORY OF DEM
1971
1974
1978
1985
1992
Cundall develops DEM to
assist with modeling rock
mechanics (Cundall 1971)
Cundall translates
the method into an
RBM code
(Cundall 1974)
Cundall translates
the method into a
FORTRAN code
(Cundall et. al 1978)
Williams and Mustoe
generalize the method,
comparing it to FEM
(Williams & Mustoe 1985)
Cundall & Hart develop
codes to perform the
DEM in 3 dimensions
(Cundall & Hart 1985)
Shi develops
Discontinuous
Deformation Analysis
(Shi 1992)
DEM
9. 9/13/2022 Discrete Element Method (DEM)
General Principles
Newton’s Second Law of Motion
Conservation of momentum
Particle motion
Force Displacement Law
Stiffness
Friction
8
Displacement / velocity boundary condition
Force boundary conditions
Force Displacement Law
(e.g. stiffness, friction)
Newton’s Second Law of
Motion
DEM
10. 9/13/2022 Discrete Element Method (DEM)
CONT’D….
Soft Sphere and Hard Sphere
Rigid particles but small overlap is allowed
Evaluates forces accurately
Simultaneous contacts possible
Impulsive forces
Exchange of momentum
One collision at a time
Soft Sphere Hard Sphere
9
12. 9/13/2022 Discrete Element Method (DEM)
CONT’D….
DEM
Main micro-parameters of particle system
Category Name
Intrinsic parameters Poisson’s ratio (ν)
Density (ρ)/kg/m3
Shear modulus (G)/Pa
Contact parameters between
particles
Coefficient of restitution
Coefficient of static friction
Coefficient of rolling friction
Contact parameters between
particles and geometry
Coefficient of restitution
Coefficient of static friction
Coefficient of rolling friction
11
13. 9/13/2022 Discrete Element Method (DEM)
General Principles DEM
12
Particle motion: Governed by Newton’s equation
Rotation of particle
M = Iα
M = I
𝑑𝜔
𝑑𝑡
M – torque acting on particle
I – moment of inertia
α – angular acceleration
𝜔 – angular momentum
14. 9/13/2022 Discrete Element Method (DEM)
DEM
Particle motion: Governed by Newton’s equation
CONT’D….
Translation of particle
F= mα
𝐹
𝑔 + 𝐹𝑐 + 𝐹𝑛𝑐= m
𝑑𝜗
𝑑𝑡
𝐹
𝑔 − gravitational force (mg)
𝐹𝑐 – contact force
𝐹𝑛𝑐 – not contact force
m – mass of the particle
𝜗– translational velocity
13
15. 9/13/2022 Discrete Element Method (DEM)
DEM
CONT’D….
14
Contact forces: Normal force
𝐹𝑐𝑛 = −𝑘𝑛𝛿𝑛 − η𝑛𝑉
𝑛
Tangential force
𝐹𝑐𝑡 = −𝑘𝑡𝛿𝑡 − η𝑡𝑉𝑡
𝑘𝑛, 𝑘𝑡 − 𝑠𝑡𝑖𝑓𝑓𝑛𝑒𝑠𝑠 𝑜𝑓 𝑡ℎ𝑒 𝑠𝑝𝑟𝑖𝑛𝑔𝑠
𝜂𝑛, 𝜂𝑡 - damping coefficients
𝛿𝑛, 𝛿𝑡 - displacement
𝑉
𝑛, 𝑉𝑡 - relative velocities
16. 9/13/2022 Discrete Element Method (DEM)
DEM
CONT’D….
15
Non - contact forces: Gravitational force
𝑭𝒈 = 𝑮
𝒎𝟏𝒎𝟐
𝒓
𝑚1𝑚2 - mass of the particle
G – gravitational constant
R – distance
Molecular forces
18. 9/13/2022 Discrete Element Method (DEM)
DEM
17
Classification of particle interaction force models
by contact force and non-contact force.
Non-Contact Force
Van der Waals force
Liquid bridge force
Electrostatic force
Linear spring model Non – linear spring
Hertz-Mindlin
Hertz-Mindlin + JKR
DMT Model
Linear Spring-Dashpot
Hysteretic Model
Thornton Model
Particle interaction
Contact Non- Contact
Elastic Inelastic
Linear model Non- linear model
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DEM
18
CONTACTMODELS
Contact between two particles occurs in the finite area
Area consists of the normal and tangential plane
Contact force - normal and tangential
Overlap (δ) = 𝑅1 + 𝑅1-d
Damping forces - friction forces and cohesive forces
Determine the acceleration of particles
20. 9/13/2022 Discrete Element Method (DEM)
DEM
19
ELASTICCONTACT MODELS
LINEAR SPRING MODEL
Two particles in contact are both normally and tangentially
connected by linear spring
Energy is not consumed and the contact is considered
completely elastic
Linear relationship b/w force and displacement
Limitation: kinetic energy is dissipated by plastic
deformation
Normal force
𝐹𝑛 = −𝑘𝑛𝛿𝑛
Tangential force
𝐹𝑡 = −𝑘𝑡𝛿𝑡
21. 9/13/2022 Discrete Element Method (DEM)
DEM
20
HERTZ-MINDLIN MODEL
Nonlinear elastic model
Contact between two particles in the normal direction – Hertz
Contact between two particles in the tangential direction – Mindlin
Hertz-Mindlin model – complexity, time-consuming
Simplification: no slip – Hertz and Mindlin
Accuracy - pharmaceutical industry
Eeq, Req and Geq are the equivalent Young’s modulus,
equivalent radius and equivalent shear modulus
22. 9/13/2022 Discrete Element Method (DEM)
DEM
21
Model the contact of cohesive particles
The adhesive theory using a balance between stored elastic
energy and loss of surface energy
Opposite force owing to the pulling force
HERTZ-MINDLIN + JKR MODEL
a - contact area
γ - surface energy
23. 9/13/2022 Discrete Element Method (DEM)
DEM
22
DMT MODEL
Cohesion at the contact periphery
Hertz-Mindlin + JKR model based on the surface energy
Suitable for hard materials
Solids with a small tip radius and low surface energy
24. 9/13/2022 Discrete Element Method (DEM)
DEM
23
INELASTICCONTACT MODELS
LINEARSPRING-DASHPOTMODEL
Elastic models – accumulation of energy
Inelastic models - to model the dissipation of energy
Plastic deformation between particles occurs
Composed of linear spring and dashpot components
Linear spring describes the repulsive forces
Dashpot dissipates the relative kinetic energy
Normal contact force
𝐹𝑐𝑛 = −𝑘𝑛𝛿𝑛 − η𝑛𝑉
𝑛
25. 9/13/2022 Discrete Element Method (DEM)
DEM
24
Uses various spring constant at the loading, Unloading and reloading
stages
Hysteretic model - linear contact models
Normal direction - a partially latched spring force-displacement model
Mindlin and Deresiwicz theory - the constant normal force in
the tangential direction
Limitation: it describes the plastic deformation only in the normal
direction
where K1 and K2 are the spring
constants in the loading and
unloading stages
HYSTERETIC MODEL
26. 9/13/2022 Discrete Element Method (DEM)
DEM
25
Explains plastic deformation
Proposed for normal contact between two elastic, perfectly
spherical plastic particles
Based on the Hertz theory
(normal force-displacement relationship during the initial
elastic loading )
Plastic deformation occurs if the limiting contact pressure is
reached at the center of the contact area
THORNTON MODEL
where Fny and δy denote the
normal contact force and
displacement
27. 9/13/2022 Discrete Element Method (DEM)
26
DEM
CONT’D….
DEM Model Workflow
Accelerations Velocities Positions
Forces Contacts
Newton’s Law
Contact mechanics
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DEM
27
Numerical solution software for DEM
Open Source Commercial
Often written in C, C++, Fortran, python and interacted
with within the terminal
Many limited to Linux/ Unix, and ran using code-
specific commands and functions, or ran from an input
file
Often more powerful, with convenient GUI’s and
built-in system coupling
Very expensive for limited licenses
ABAQUS: ~ $ 65,000
29. 9/13/2022 Discrete Element Method (DEM)
DEM
28
Discrete Element Modeling - DEM Software | Altair EDEM
https://www.altair.com › edem
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DEM
29
1. Rogers, A.; Ierapetritou, M. Challenges and opportunities in modeling pharmaceutical manufacturing
processes. Comput. Chem. Eng. 2015, 81, 32–39.
2. U.S. Food and Drug Administration. Guidance for industry: Q8 (R2) pharmaceutical development; Food
and Drug Administration: White Oak, MD, USA, 2006.
3. Suresh, P.; Basu, P.K. Improving pharmaceutical product development and manufacturing: Impact on cost
of drug development and cost of goods sold of pharmaceuticals. J. Pharm. Innov. 2008, 3, 175–187.
4. Ketterhagen,W.R.; am Ende, M.T.; Hancock, B.C. Process modeling in the pharmaceutical industry using
the discrete element method. J. Pharm. Sci. 2009, 98, 442–470.
5. Kremer, D.; Hancock, B. Process simulation in the pharmaceutical industry: A review of some basic
physical models. J. Pharm. Sci. 2006, 95, 517–529.
References
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DEM
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6. Pandey, P.; Bharadwaj, R. Predictive Modeling of Pharmaceutical Unit Operations; Woodhead
Publishing: Cambridge, UK, 2016.
7. Björn, I.N.; Jansson, A.; Karlsson, M.; Folestad, S.; Rasmuson, A. Empirical to mechanistic modelling in
high shear granulation. Chem. Eng. Sci. 2005, 60, 3795–3803.
8. Reklaitis, G.V.; García-Munoz, S.; Seymour, C. Comprehensive Quality by Design for Pharmaceutical
Product Development and Manufacture; JohnWiley & Sons: Hoboken, NJ, USA, 2017.
9. Wassgren, C.; Curtis, J.S. The application of computational modeling to pharmaceutical materials
science. MRS Bull. 2006, 31, 900–904.
10. Norton, T.; Sun, D.-W. Computational fluid dynamics (cfd)—An eective and effcient design and
analysis tool for the food industry: A review. Trends Food Sci. Technol. 2006, 17, 600–620.
CONT’D….