Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 18 of 18 for “"Dem Model"”.
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Simulation of urea particle flow using DEM for dry fertilizer spreading optimization
… study aims to develop a discrete element method (DEM) model for urea and assessed it through a calibration and multi-method validation framework pertinent to fertilizer spreader applications. Urea was first characterized experimentally for particle size and density, and the DEM particles were …
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CFD – DEM Modeling and Parallel Implementation of Three Dimensional Non- Spherical Particulate Systems
… dynamics of particle mixtures. Alternatively, modeling dense fluid-particulate systems using non-spherical particles involves increased complexity, with computational cost manifesting as the biggest bottleneck. However, with recent advancements in computer hardware, simulations of …
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Discrete element method modelling of particle breakage and wear in High Pressure Grinding Rolls
… This study aims to develop a comprehensive model based on the discrete element method (DEM) to investigate the grinding process of HPGR and understand the underlying mechanisms. A laboratory-scale geometrical model of the HPGR mill was developed and the dynamic response of the rolls in the …
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Multi-scale modeling of the hydrodynamics, sediment transport, and morphodynamics in the nearshore
… to different wave events has always been demanding in coastal zones. Here, a multi-scale modeling approach was taken to study the hydrodynamics and the underlying sediment transport and morphodynamics for a variety of bed sediment configurations under different wave conditions. First, …
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Konzepte für die Kommunikation zwischen Automatisierungsgeräten
… von externen Kommunikationsbausteinen. Mit dem Model der blockorientierten Übertragung ist die Möglichkeit gegeben, eine geräteübergreifende Verbindung durch einfache Verschaltung der technologischen Bausteine innerhalb eines Planes zu projektieren. Und es ist möglich, den Prozeß im …
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Investigation of Toughening Mechanisms in the Fracture of Asphalt Concrete Using the Clustered Discrete Element Method
… surfaces. A clustered discrete element method (DEM) is employed as a means to investigate fracture mechanisms in asphalt concrete at low temperatures. A bilinear cohesive softening model is implemented into the DEM framework to enable simulation of crack initiation and propagation in asphalt …
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Characterization and numerical simulation of the microstructural and micromechanical viscoelastic behavior of oil sands using the discrete element method
… these problems, there is a need to develop valid models that capture the behavior and performance of oil sands under these loads. Particle-based physics methods, such as the discrete element method (DEM) can provide useful insight into the micromechanical and microstructural behavior of oil sands. …
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A Collaborative Web Application Framework for Least Cost Caloric Paths with Constraints on High Resolution Data
… Least cost caloric paths are a more realistic model of how humans travel on foot across terrain. Previous work has been done in computing and visualizing least cost caloric paths. This thesis presents a framework and implementation for a web application spatial data visualization tool, built in …
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Responsible Conduct of Research with Computational Models and Simulations
Research with computational models and simulations has become integral to many science and engineering fields; computation now rivals experimentation as a mode of scientific research. Despite the rapid growth of literature on computational modeling, little has been done to examine the standards of …
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Discrete Element Modeling of Railway Ballast for Studying Railroad Tamping Operation
… operation is studied by developing a simulation model using the Discrete Element Model (DEM), with the aim of optimizing the railroad tamping operation. A comprehensive literature review is presented showcasing the applicability of DEM techniques in modeling ballast behavior and its feasibility …
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Modeling the dynamics and stresses of elongated particles in vertical axis mixers
… spherical particles. This thesis focuses on modeling and analysis of dynamics and stresses of elongated particles processed in vertical axis mixers. Elongated particles are of particular interest in the operation of pharmaceutical AFDs since the particles processed in such devices are often …
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Neuer Optimierungsansatz für die Entwicklung hochkomplexer monolithisch integrierter Indiumphosphid Mach-Zehnder Terabit Transmitterchips
Um dem auch zukünftig stark ansteigenden Datenverkehrsaufkommen gerecht zu werden, bedarf es leistungsfähiger optischer Daten- und Kommunikationsnetze stetig steigender Kapazität. Das ist nur zu erreichen durch eine ständige Weiterentwicklung aller erforderlichen Netzkomponenten im Hinblick auf …
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Formation of C 3 and C 2 in cometary comae
… Zweck wurde ein eindimensionales Multi-Fluid-Model der Komachemie verbessert und angewendet. In dieser Arbeit wurden dem Model neue Photoreaktionen hinzugefügt, die Ratenkoeffizienten aktualisiert und deren Unsicherheiten zum ersten Mal umfassend berechnet. Es wurde eine Sensitivitätsanalyse …
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CFD-DEM MODELLING OF PARTICLE-GAS REACTIVE FLOWS AND ITS APPLICATION IN BLAST FURNACE REGIONS
… a set of high-accuracy, efficient particle-scale models designed to simulate particle-gas reactive flows coupled with phase changes. These models are employed to investigate key phenomena within an ironmaking blast furnace (BF). 1) An advanced reactive computational fluid dynamics-discrete element …
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Integrated computational and experimental framework for the assessment of railroad ballast life-cycle behavior
… the micro-scale, which is a key perspective in modeling more realistically the behavior of any aggregate layer assembly. The main focus in this research effort has been to develop an integrated computational-experimental framework to evaluate ballast life-cycle behavior. Laboratory experiments …
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Modeling Macro-scale Clay Behavior at Micro-scale Clay Particle Interfaces
… friction experiments conducted in this research demonstrated that an Atomic Force Microscope (AFM) can be used to obtain coefficient of friction (μ) measurements for montmorillonite. This method allows for the measurements to be performed over spatial scales of a few microns, can be done under …
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Discrete element method based scale-up model for material synthesis using ball milling
… in various areas. In this work, a scale-up model for describing this ball milling process is developed. The thesis is a combination of experimental and modeling efforts. Initially, Discrete Element Model (DEM) is used to describe energy transfer from milling tools to the milled powder for …
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Train-track discrete-element-method model for simulating ballasted track dynamics: coupling and validation
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-02-04 without embargo terms