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Dissertations / Theses on the topic 'DEM method'

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Published: 4 June 2021
Last updated: 17 February 2022

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1

Chaumeil, Florian. "Using DEM-CFD method at colloidal scale." Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/8066.

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The aim of this work is to look into the applicability of Discrete Element Modelling (DEM) coupled to Computational Fluid Dynamics (CFD) to simulate micro-scale colloidal particles immersed in fluid. Numerical methods were implemented through the commercial framework of EDEM2.3. As opposed to dissolved matter, which behaves as a continuum within the fluid medium, particulate matter is made of discrete entities that interact amongst themselves, and with the fluid and any physical boundaries. Particulate matter is ubiquitous in many purification processes that would beneficiate from having an ea
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2

Sukcharoenpong, Anuchit. "Shoreline Mapping with Integrated HSI-DEM using Active Contour Method." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1406147249.

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3

Sadek, Mohammad. "Modeling biofibre (hemp) processing using the discrete element method (DEM)." Food & Process Engineering Institute Division of ASABE, 2011. http://hdl.handle.net/1993/18484.

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The main objective of the research was to understand hemp processing at different stages through numerical simulations. Processing of hemp materials involves breaking the hemp into different sizes of particles and separating those particles into fractions of different sizes. Numerical models were developed using the discrete element method (DEM) to simulate hemp processing using a hammermill and separations of different hemp particles using a 3D vibratory screen-type separator. The models were implemented using a commercial DE code, the Particle Flow Code in Three Dimension (PFC3D). In the mod
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4

Gong, Guobin. "DEM [Discrete Element Method] simulations of drained and undrained behaviour." Thesis, University of Birmingham, 2008. http://etheses.bham.ac.uk//id/eprint/143/.

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This thesis reports the results of DEM (Discrete Element Method) simulations of the behaviour of granular material for axisymmetric compression and plane strain deformation under both drained and undrained conditions. The aim is to study the behaviour of saturated granular material using DEM and the objectives of this thesis are: • to explore the drained behaviour of granular material using DEM • to explore the undrained behaviour of loose samples of granular material with and without preshearing history, using DEM • to compare axisymmetric compression and plane strain behaviour of a granular
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5

Peng, Bo. "Discrete Element Method (DEM) Contact Models Applied to Pavement Simulation." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/50399.

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Pavement is usually composed of aggregate, asphalt binder, and air voids; rigid pavement is built with hydraulic cement concrete; reinforced pavement contains steel. With these wide ranges of materials, different mechanical behaviors need to be defined in the pavement simulation. But so far, there is no research providing a comprehensive introduction and comparison between various contact models. This paper will give a detail exploration on the contact models that can be potentially used in DEM pavement simulation; in the analysis, it includes both a theoretical part, simulation results and co
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6

Dallinger, Niels, and Jörg Hübler. "Simulation of Bottle Conveyors – Opportunities of the Discrete Element Method (DEM)." Universitätsbibliothek Chemnitz, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-231768.

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The Discrete Element Method (DEM) provides an approach to recognition of the problems within bottle conveyors at an early stage of the engineering process. Key points in bottle conveyor systems, such as buffers, ejectors, diverters and transfers can be numerically analyzed. It is possible to calculate forces on lateral guides and forces between bottles within accumulation situations. The DEM provides an alternative opportunity for the virtual process optimization and numeric case studies of conveying systems at beverage and food industries<br>Die diskrete Elementmethode (DEM) ermöglicht in ein
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7

Tsuruta, Naoki. "Improved Particle Method with High-Resolution and Computational Stability for Solid-Liquid Two-Phase Flows." 京都大学 (Kyoto University), 2014. http://hdl.handle.net/2433/188536.

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8

Vadluga, Vaidas. "Simulation of dynamic deformation and fracture behaviour of heterogeneous structures by discrete element method." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2008. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2008~D_20080213_082157-83281.

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Research area and topicality of the work. Mechanical properties and their evolution under loading are the most significant factors for the development of various mechanical structures, technologies and equipment. It seems to be natu-ral that deeper understanding of the behaviour of existing and design of new materials presents a challenge in different research areas. It should be noted, that all the materials are heterogeneous in meso- and micro- scales. They exhibit essential differences, compared to the macroscopic continuum behaviour. Basically, both experimental and numerical simulation m
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9

Zhou, Yu. "Simulation of High-velocity Penetration for Rigid Projectile into Plain Concrete Target using Discrete Element Method." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/31325.

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Penetration of high velocity is of concern for both civilian and military research for decades, and computerized simulation is the scholarâ s focus in recent years. This study presents a study on the Discrete Element Method (DEM) simulation of plain concrete targetâ s behavior under high-velocity penetration of rigid projectile. In this thesis, different types of research works including empirical, analytical and numerical methods in penetration by the previous scholars were carefully reviewed. A DEM-based concrete model was established by using software PFC3D. The major micro-variables o
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10

Johnstone, Mical William. "Calibration of DEM models for granular materials using bulk physical tests." Thesis, University of Edinburgh, 2010. http://hdl.handle.net/1842/4655.

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From pharmaceutical powders to agricultural grains, a great proportion of the materials handled in industrial situations are granular or particulate in nature. The variety of stesses that the matierals may experience and the resulting bulk behaviours may be complex. In agricultural engineering, a better understanding into agricultural processes such as seeding, harvesting, transporting and storing will help to improve the handling of agricultural grains with optimised solutions. A detailed understanding of a granular system is crucial when attempting to model a system, whether it is on a micro
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11

Mazor, Alon. "Modelling of roll compaction process by finiite element method." Thesis, Ecole nationale des Mines d'Albi-Carmaux, 2017. http://www.theses.fr/2017EMAC0009/document.

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Dans l’industrie pharmaceutique, la granulation sèche par compactage à rouleaux est un procédé d’agglomération de poudres en granulés pour améliorer les propriétés d’écoulement nécessaire pour le procédé de compression en matrice. Comprendre le procédé de compactage à rouleaux et optimiser l’efficacité de production est limitée par l’utilisation de l’approche expérimentale à cause du coût élevé des poudres, le temps des essais et la complexité du procédé. Dans ce travail, une méthode d’éléments finis en 3D, est développée dans le but d’identifier les paramètres critiques du matériau et du proc
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12

Krenzer, Knut. "Entwicklung eines zustandsabhängigen DEM-Stoffmodells zur Nachbildung von Mischprozessen für Frischbeton." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-226677.

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In der vorliegenden Dissertation wird ein Simulationsmodell für die Diskrete Elemente Methode vorgestellt, das in der Lage ist, das Materialverhalten während des Mischprozesses von Frischbeton nachzubilden. Zur realitätsnahen Abbildung des Materialverhaltens während des gesamten Mischprozesses ist zum einen die korrekte, prozessabhängige Modellierung der Feuchtigkeitsverteilung im Mischgut notwendig. Zum anderen definiert sich das lokale Materialverhalten durch den aktuellen Feuchtegrad und die Materialzusammensetzung der Mischung und muss im Simulationsmodell Berücksichtigung finden. Zur korr
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13

Nasato, Daniel Schiochet. "Desenvolvimento de acoplamento númerico entre o método dos elementos discretos (DEM) e o método dos elementos finitos." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/266925.

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Orientadores: José Roberto Nunhez, Nicolas Spogis<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Química<br>Made available in DSpace on 2018-08-17T20:12:44Z (GMT). No. of bitstreams: 1 Nasato_DanielSchiochet_M.pdf: 8429075 bytes, checksum: 08b5ea34c892e0a82506be022a1613ee (MD5) Previous issue date: 2011<br>Resumo: Este trabalho propõe um acoplamento entre o método dos elementos discretos (DEM), utilizado para simular o manuseio de materiais particulados, e o método dos elementos finitos (FEM), utilizado para estimar respostas estruturais a uma dada con
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14

Hedman, Stefan. "Smooth and non-smooth approaches to simulation of granular matter." Thesis, Umeå universitet, Institutionen för fysik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-50584.

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Granular matter is defined as a collection of particle grains, such as sand.This type of matter have different characteristics (solid, liquid and gas) depending on the energy level per grain. There are several approaches to modeling and numerical simulations of granular matter. They are used by different groups for different purposes, and the choice between the approaches is based on knowledge and tradition rather than what might be best for the purpose. The key questions are when to use what method and what physical quality is lost depending on the choice.Two regimes of discrete element granu
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15

Brown, Nicholas John. "Discrete element modelling of cementitious materials." Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/8011.

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This thesis presents a new bonded particle model that accurately predicts the wideranging behaviour of cementitious materials. There is an increasing use of the Discrete Element Method (DEM) to study the behaviour of cementitious materials such as concrete and rock; the chief advantage of the DEM over continuum-based techniques is that it does not predetermine where cracking and fragmentation initiate and propagate, since the system is naturally discontinuous. The DEM’s ability to produce realistic representations of cementitious materials depends largely on the implementation of an inter-part
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16

Zelelew, Habtamu Melese. "Simulation of the permanent deformation of asphalt concrete mixtures using discrete element method (DEM)." Online access for everyone, 2008. http://www.dissertations.wsu.edu/Dissertations/Spring2008/h_zelelew_031908.pdf.

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17

Li, Huiqi. "Discrete element method (DEM) modelling of rock flow and breakage within a cone crusher." Thesis, University of Nottingham, 2013. http://eprints.nottingham.ac.uk/14528/.

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A cone crusher is a crushing machine which is widely used in the mining, construction and recycling industries. Previous research studies have proposed empirical mathematical models to simulate the operational performance of a cone crusher. These models attempt to match the size distributions of the feed and product streams. The flow of the rock and its breakage within the cone crusher chamber are not explicitly modelled by these methods. Moreover, the ability to investigate the changes in crusher performance affected by changes to the crusher design geometry and/or operating variables (includ
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18

Chakreyavanich, Udomsak. "Regular grid DEM data compression by using zero-crossing : the automatic breakline detection method /." The Ohio State University, 1989. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487683756126736.

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19

Gibaud, Robin. "Application de la méthode des éléments discrets aux déformations finies inélastiques dans les multi-matériaux." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAI086/document.

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Le formage de matériaux multiphasés comprend des mécanismes complexes en lien avec la rhéologie,la morphologie et la topologie des phases.Du point de vue numérique,la modélisation de ces phénomènes en résolvant les équations aux dérivées partielles (EDP) décrivant le comportement continu des phases n'est pas trivial.En effet,de nombreuses discontinuités associées aux phases se déplacent et peuvent interagir.Ces phénomènes peuvent être conceptuellement déclicats à intégrer au modèlecontinu et coûteux en termes de calcul.Dans cette thèse,la méthode des éléments discrets (DEM) est utilisée pour m
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20

Tran, Duc Kien. "Modélisation numérique discrète de l'érosion interne par renard hydraulique dans les barrages ou digues en terre." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEC055/document.

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Le travail présenté dans ce mémoire de thèse porte sur la modélisation discrète de l’évolution régressive du front d’un conduit d’érosion qui peut se produire dans les barrages ou digues en remblai. Des outils numériques ont été développés en se basant sur le couplage entre la méthode des éléments discrets (DEM) et la méthode de Boltzmann sur réseau (LBM) pour la description, respectivement, des phases solide et fluide. L’implémentation de la méthode DEM suit une approche standard de type dynamique moléculaire (DM) et les interactions intergranulaires sont modélisées par des contacts unilatéra
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21

Lahoda, Lothar. "Standardisierung und Überprüfung der "Fix vital stain method", einer neuen Färbemethode für Stiersperma mit dem Fluoreszenzfarbstoff Hoechst H33258 /." [S.l.] : [s.n.], 1995. http://www.ub.unibe.ch/content/bibliotheken_sammlungen/sondersammlungen/dissen_bestellformular/index_ger.html.

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22

Fanelli, Maddalena. "UNDERSTANDING AGGLOMERATE DISPERSION: EXPERIMENTS AND SIMULATIONS." online version, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=case1119374160.

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23

Kasina, Veera Pratap Reddy. "DEM modelling and quantitative validation of flow characteristics and blending of pellets in a planar silo." Thesis, University of Edinburgh, 2016. http://hdl.handle.net/1842/25525.

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Blending processes in a silo minimise the fluctuations in the property of bulk solids with the blending performance being strongly influenced by the flow pattern and operating mode among other process parameters such as batch size and type of input fluctuations. An accurate prediction of flow characteristics such as flow channel boundary and velocity profiles is important for understanding and quantifying the blending performance, thereby increasing the scope for new design by minimising the number of expensive pilot scale experiments required. In this thesis, the Discrete Element Method (DEM)
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24

Nishiyama, Kenta. "Analysis of Soil-Tire Interaction Using a Two-Dimensional Finite Element-Discrete Element Method." Kyoto University, 2019. http://hdl.handle.net/2433/245298.

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25

NOORHAZLINDA, BINTI ABD RAHMAN. "MODELING FOR ACTIONS OF DIRECTIONAL SWITCHING AND GROUPING IN DEM-BASED CROWD BEHAVIOR SIMULATOR." 京都大学 (Kyoto University), 2015. http://hdl.handle.net/2433/199258.

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26

Morrissey, John Paul. "Discrete element modelling of iron ore pellets to include the effects of moisture and fines." Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/8270.

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Across industry the majority of raw materials handled are particulate in nature, ranging in size and properties from aggregates to powders. The stress regimes experienced by the granular solids vary and the exhibited bulk behaviours can be complex and unexpected. The prevalence of granular solids makes them an area of interest for industry and researchers alike as many challenges still remain, such as dealing with complex cohesive behaviour in materials, which often gives rise to handling difficulties. Storage and transportation are an important part of the process chain for industries where p
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27

Thakur, Subhash Chandra. "Mesoscopic discrete element modelling of cohesive powders for bulk handling applications." Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/9777.

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Many powders and particulate solids are stored and handled in large quantities across various industries. These solids often encounter handling and storage difficulties that are caused by the material cohesion. The cohesive strength of a bulk material is a function of its past consolidation stress. For example, high material cohesive strength as a result from high storage stresses in a silo can cause ratholing problems during discharge. Therefore, it is essential to consider the stress-history dependence when evaluating such handling behaviour. In recent years the Discrete Element Method (DEM)
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28

Tichý, Richard. "Beitrag zur numerischen Untersuchung der Bewegungs- und Beanspruchungsprofilen in einer Kugelmühle unter Verwendung von physikalisch begründeten Stoßparametern." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2011. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-69915.

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Die am häufigsten für die Zerkleinerung des Zementklinkers eingesetzte Kugelmühle stellt eine relativ einfache Maschine dar, in der sehr komplizierte dynamische Wechselwirkungen herrschen. Die direkte Messung der Beanspruchungsintensitäten ist heutzutage immer noch eine schwierige Aufgabe. In der vorliegenden Arbeit sind die Spektren der Beanspruchungsgrößen sowie einige spezifische integrale Größen mit der Methode der diskreten Elemente (DEM) untersucht worden. Eine besondere Aufgabe bestand in der Ermittlung der Parameter des viskoelastischen Kontaktmodells und der den Zementklinker charakte
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Deb, Surya D. "Investigation of fluidized bed systems using coupled DEM-CFD framework." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/52902.

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Fluidized beds have widespread industrial applications ranging from chemical industries to power plants. The flow inside a fluidized bed system consists of two main phases, a particle phase and the fluid phase. The two phases are strongly coupled to each other through various forces like drag and pressure. Capturing this multiphase phenomenon requires modeling strategies that possess good fidelity over a range of scales. Discrete Element Modeling (DEM) coupled with Computational Fluid Dynamics (CFD) provides a good platform to analyze the complex coupled multiphase hydrodynamics inside fluidiz
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30

Song, Yongxin. "Study of the dynamic behavior of tablet movement in a rotating drum using discrete element modeling (DEM) method." Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4681.

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Thesis (Ph. D.)--West Virginia University, 2006.<br>Title from document title page. Document formatted into pages; contains xi, 110 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 105-110).
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Busta, Michal. "Analýza namáhání vybraných konstrukčních částí bagru při provozu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-443770.

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This thesis is focused on the issue of computational modeling of soil harvesting while using the compact excavator from the company DOOSAN BOBCAT EMEA s.r.o.. The solution consists in creating two computational models in Rocky DEM and Ansys Mechanical. Rocky DEM software is used to solve the disconnection of soil by excavator components using the discrete element method. The outcome includes courses of forces and moments during the particular time of the individual joints of the model that was used. The obtained courses are then applied as an external load to the joint of a selected structural
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32

Desai, Prathamesh. "Tribosurface Interactions involving Particulate Media with DEM-calibrated Properties: Experiments and Modeling." Research Showcase @ CMU, 2017. http://repository.cmu.edu/dissertations/1123.

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While tribology involves the study of friction, wear, and lubrication of interacting surfaces, the tribosurfaces are the pair of surfaces in sliding contact with a fluid (or particulate) media between them. The ubiquitous nature of tribology is evident from the usage of its principles in all aspects of life, such as the friction promoting behavior of shoes on slippery water-lubricated walkways and tires on roadways to the wear of fingernails during filing or engine walls during operations. These tribosurface interfaces, due to the small length scales, are difficult to model for contact mechani
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33

Sundström, Anton. "Numerical modelling for characterization of the granular flows impact on the gas flow in a packed-bed-reactor." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-79538.

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The goal of the project was to characterize the granular flows impact on the gas flow in a packed-bed-reactor. The study was created at Swerim as a master's thesis for Luleå University of Technology. The packed-bed-reactor geometry used in this study is a scaled down blast furnace model. The granular flow was modelled using the discrete element method (DEM) in LS-DYNA. Four models were created with different sizes and size distribution of the particles. To study the granular flows impact on gas flow, porosity is extracted from the DEM models and analyzed, since porosity has a direct impact on
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Ben, Turkia Salma. "Etude expérimentale et numérique du comportement mécanique des matériaux granulaires : De la simulation discrète d'essais de laboratoire à la mise en place d'une procédure de calibration des paramètres d'entrée." Thesis, Ecole nationale supérieure Mines-Télécom Lille Douai, 2020. http://www.theses.fr/2020MTLD0004.

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Le traitement, le transport, la maniabilité et le stockage des matériaux granulaires sont à l’origine de nombreuses opérations industrielles. Il est donc essentiel de prévoir de manière fiable la dynamique des matériaux granulaires pour un bon fonctionnement et une optimisation du processus. Les matériaux granulaires sont des systèmes complexes qui peuvent se présenter sous différents états statiques, quasi-statiques et dynamiques. La manifestation des phénomènes de ségrégation et de blocage (formation de voûtes) peuvent être problématiques pour les industriels. La prédiction du comportement e
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Zhao, Tao. "Investigation of landslide-induced debris flows by the DEM and CFD." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:316cb3fc-dfc6-4e5a-bc0d-298e298c9c5b.

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In recent years, the increasing impacts of landslide hazards on human lives and lifeline facilities worldwide has advanced the necessity to find out both economically acceptable and useful techniques to predict the occurrence and destructive power of landslides. Though many projects exist to attain this goal, the current investigation set out to establish an understanding of the initiation and propagation mechanisms of landslides via numerical simulations, so that mitigation strategies to reduce the long-term losses from landslide hazards can be made. In this research, the Discrete Element Met
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Volk, Annette. "Quantification and Assessment of Numerical Error in Coupled Computational Fluid Dynamics - Discrete Element Method Simulations of Gas Flow through Granular Solids." University of Cincinnati / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1543139366302536.

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37

Karatza, Zeynep. "A study of temporal and spatial evolution of deformation and breakage of dry granular materials using x-ray computed tomography and the discrete element method." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/28722.

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Particles exist in great abundance in nature, such as in sands and clays, and they also constitute 75% of the materials used in industry (e.g., mineral ores, formulated pharmaceuticals, dyes, detergent powders). When a load is applied to a bulk assembly of soil particles, the response of a geomaterial at the bulk (macro) scale, originates from the changes that take place at the particle scale. If particle breakage occurs, the shape and size of the particles comprising the bulk are changed; this induces changes in the contact network through which applied loads are transmitted. As a result, cha
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Paul, Steven Timothy. "A Computational Framework for Fluid-Thermal Coupling of Particle Deposits." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/83544.

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This thesis presents a computational framework that models the coupled behavior between sand deposits and their surrounding fluid. Particle deposits that form in gas turbine engines and industrial burners, can change flow dynamics and heat transfer, leading to performance degradation and impacting durability. The proposed coupled framework allows insight into the coupled behavior of sand deposits at high temperatures with the flow, which has not been available previously. The coupling is done by using a CFD-DEM framework in which a physics based collision model is used to predict the post-coll
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Shimizu, Hiroyuki. "Distinct element modeling for fundamental rock fracturing and application to hydraulic fracturing." 京都大学 (Kyoto University), 2010. http://hdl.handle.net/2433/120827.

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40

Louati, Haithem. "Experimental and numerical study of humid granular material : influence of liquid content in quasi-static regime." Thesis, Ecole nationale des Mines d'Albi-Carmaux, 2016. http://www.theses.fr/2016EMAC0008/document.

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Cette thèse est une étude expérimentale et numérique du comportement au cisaillement de milieu granulaire humide sous l’effet de la quantité de liquide introduite et la contrainte normale appliquée. Les expériences ont été faites sur une cellule de cisaillement annulaire, pour une large gamme de contraintes appliquées allant de presque 0.3 kPa à 12 kPa. Les résultats donnent la variation de la contrainte de cisaillement en régime stationnaire en fonction de la contrainte normale pour une large variation de la quantité de liquide. Le liquide dans le milieu granulaire va de ponts liquides formés
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Mesnier, Aline. "Étude expérimentale et simulation de la ségrégation mécanique et thermique de billes millimétriques dans un séchoir de type tambour tournant." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSE1046/document.

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La problématique de l’homogénéité de traitement mécanique et thermique d’un lit particulaire bi-disperse en tailles ou en densités dans un tambour tournant horizontal a été abordée. Dans la première partie, le mélange des billes sphériques millimétriques dans un tambour de type ‘tranche’ a été observé expérimentalement à l’aide des maquettes originales et simulé numériquement à l’aide d’un code commercial de type DEM. En ajustant le coefficient de frottement entre les billes, un accord satisfaisant a été obtenu entre les résultats des simulations et des expériences. Le lit a été globalement ca
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Wilke, Charel Daniel. "Experimental measurement of graphite wear in helium at elevated temperatures and the discrete element modelling of graphite dust production inside the Pebble Bed Modular Reactor." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/80211.

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Thesis (MScEng)--Stellenbosch University, 2013.<br>ENGLISH ABSTRACT: Production of graphite dust inside the Pebble Bed Modular Reactor (PBMR) influences the reactor operation negatively. Graphite is used as a moderator in the reactor core and the formation and transportation of graphite dust away from the reactor core decreases the amount of moderator which in turn has a negative impact on the reactor operation. High levels of radioactive dust may also contaminate reactor components which may pose a health risk to maintenance personnel. In this study a pressure vessel was designed and u
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43

Min, Ki-Bok. "Fractured Rock Masses as Equivalent Continua - A Numerical Study." Doctoral thesis, KTH, Land and Water Resources Engineering, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3742.

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<p>In this thesis, fractured rock masses are treated asequivalent continua for large-scale analyses of rockengineering projects. Systematic developments are made for thedetermination of equivalent mechanical and hydraulic propertiesof fractured rock masses using a hybrid discrete fracturenetwork - distinct element method (DFN-DEM) approach. Thedetermined equivalent properties are then used for a far-fieldfinite element analysis of the thermo-mechanical impacts on thestress, deformation and permeability of fractured rockssurrounding a hypothetical geological repository of nuclearwaste. The geol
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44

Beckstein, Pascal. "Methodenentwicklung zur Simulation von Strömungen mit freier Oberfläche unter dem Einfluss elektromagnetischer Wechselfelder." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-232474.

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Im Bereich der industriellen Metallurgie und Kristallzüchtung treten bei zahlreichen Anwendungen, wo magnetische Wechselfelder zur induktiven Beeinflussung von leitfähigen Werkstoffen eingesetzt werden, auch Strömungen mit freier Oberfläche auf. Das Anwendungsspektrum reicht dabei vom einfachen Aufschmelzen eines Metalls in einem offenen Tiegel bis hin zur vollständigen Levitation. Auch der sogenannte RGS-Prozess, ein substratbasiertes Kristallisationsverfahren zur Herstellung siliziumbasierter Dünnschichtmaterialien, ist dafür ein Beispiel. Um bei solchen Prozessen die Interaktion von Magnetf
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Olmedilla, González de Mendoza Antonio. "Grain motion and packing : application to metallic alloy solidification." Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0265/document.

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La modélisation multi-échelle multi-physique de la solidification d'alliages métalliques demande de combiner des phénomènes à l'échelle macroscopique du produit et microscopiques à l'échelle des structures de solidification. Dans cette thèse, l'empilement aléatoire des grains équiaxes avec des morphologies typiques de solidification est étudié. Nous mettons tout d'abord en évidence les paramètres hydrodynamiques adimensionnels qui régissent l'empilement de grains équiaxes : le nombre de Stokes, St, le nombre d'Archimède, Ar, et le rapport entre le temps caractéristique de la croissance et le t
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Coetzee, C. J. (Cornelis Jacobus). "Forced granular flow." Thesis, Stellenbosch : Stellenbosch University, 2000. http://hdl.handle.net/10019.1/51764.

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Thesis (MEng)--University of Stellenbosch, 2000.<br>ENGLISH ABSTRACT: The main goal of the thesis is to validate the ability of discrete element methods (DEM) to predict forced granular flow. Granular flow occurs in a broad spectrum of industrial applications. The thesis focuses on earthmoving processes typical of the mining and agricultural industries. Existing soil mechanics soil-tool models are also investigated and general flow behaviour in and around blades and buckets are established. Soil mechanics theories are used to predict the draft forces on a flat blade moving through granu
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Dallinger, Niels. "Die Diskrete Elemente Methode als Simulationsmethode in der Vibrationsfördertechnik." Doctoral thesis, Universitätsbibliothek Chemnitz, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-229364.

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Vibrationsförderer sind Stetigförderer, welche Fördergüter durch periodische Schwingbewegungen in gerichtete Bewegungen versetzen. Vibrationsförderer sind in der Handhabungstechnik, der Zuführung von Mikrobauteilen und feinen Pulvern, sowie in der Schüttgut verarbeitenden Schwerindustrie weit verbreitet. In dieser Arbeit erfolgt nach der Betrachtung des Stands der Technik von Vibrationsförderern und den Interpretationsmöglichkeiten der Förderorganbewegung, die Vorstellung und Diskussion weiterer analytischer Berechnungsansätze. Anschließend werden Störprozesse, die während des Guttransportes a
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48

Jakel, Roland. "Das neue Kontaktmodell mit endlicher Reibung in Creo Simulate 3.0 : Theorie und Anwendung ; Vergleich mit dem reibungsfreien und unendlich reibungsbehafteten Kontaktmodell." Universitätsbibliothek Chemnitz, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-206817.

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Der Vortrag beschreibt die zugrunde liegende Theorie und die Softwarefunktionalität des in PTC Creo Simulate 3.0 eingeführten Kontaktmodells mit endlicher Reibung und vergleicht dieses mit den bis Creo Simulate 2.0 exklusiv verwendeten Kontaktmodellen (ideal reibungsfrei und unendlich reibungsbehaftet). An zwei Modellbeispielen (ein von zwei Bremsbacken geklemmtes Bremsschwert und ein verschraubtes Schwungrad) wird versucht, die Funktionsweise des neuen Modells zu demonstrieren. Wegen aktueller Qualitätsprobleme der Software wird die Brauchbarkeit der Kontaktmodelle für den Anwender bewertet (
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Volk, Annette. "Quantification of Numerical and Modeling Errors in Simulation of Fluid Flow through a Fixed Particle Bed." University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1448275079.

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Juda, Lukáš. "Zařízení pro zásyp odpichového otvoru obloukové pece." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232163.

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Diploma thesis describes design and function verification of device for filling tap hole of electric arc furnace with tap hole diameter from 190 mm to 250 mm. The theses includes drive design calculation of chute swinging movement and bearing calculations. Another part of the thesis deals with verification of device functions which it is completed with process description of creating DEM simulation in program YADE. The thesis also includes basic experiments for determination angle of internal friction, angle of repose, coefficient of restitution and angle of material friction on a steel surfac
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