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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 20 of 74 for “"Discrete element method (DEM)"”.
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Discrete Element Method (DEM) Contact Models Applied to Pavement Simulation
… contact models that can be potentially used in DEM pavement simulation; in the analysis, it includes both a theoretical part, simulation results and computational time cost, which can reveal the fundamental mechanical behaviors for the models, and that can be a reference for researchers to …
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An assessment of software packages as applied to particles in a rotating mill
… Code (PFC²D). The numerical codes differe in the method of inputting data as well as the theoretical models used. ELFEN and ABAQUS are finite element (FEM) packages wheras PFC²D uses the discrete element method (DEM). The packages also differ in the integration and contact schemes, as well as the …
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Development of a reduced-order modeling technique for granular locomotion
… namely plasticity-based continuum modeling, discrete element method (DEM) modeling, along with RFT and collaborative experimentation are used for evaluation and expanding upon the capabilities of granular RFT. A dimensionless formulation corresponding to the onset of catastrophic rise in …
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A one-way coupled DEM-CFD scheme to mode free-surface flows in tumbling mills
… purely particle-based description, coupling the discrete element method (DEM) for the solids with smoothed particle hydrodynamics (SPH) for the fluids. This work is the first presentation of a 3-phase approach for tumbling mills that combines a particle description for the solids, DEM, and a …
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Simulation of High-velocity Penetration for Rigid Projectile into Plain Concrete Target using Discrete Element Method
… recent years. This study presents a study on the Discrete Element Method (DEM) simulation of plain concrete target'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 …
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A DEM numerical modelling approach to simulating size segregation of media in a stirred mill and effects on grind characteristics
… grinding beads in the mill. For this study, the discrete element method (DEM) was used to simulate dry size-segregated systems in a vertical stirred mill. These size-segregated systems were evaluated at different impeller speeds and weight distributions. The dry systems were susceptible to the …
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Parametric Analysis of Particle Spreading with Discrete Element Method
… platform is vital in most additive manufacturing methods, including direct laser sintering. Several processing parameters such as particle size, inter-particle friction, blade speed, and blade gap size affect the spreading process and, therefore, the final product quality. The objective of this …
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Microscale Investigation of the Influence of Interparticle Cohesion on the Macro-Behaviour of Soil
… particularly through advanced computational methods such as discrete element method (DEM), cohesive interactions between soil particles are often neglected and simplified. This thesis aims to address this critical gap by considering the cohesive behaviour in DEM and CFD-DEM simulations and …
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A coupled DEM/CFD analysis of die filling process
… an Eulerian-Lagrangian model, which employs a Discrete Element Method (DEM) for the particles and Computational Fluid Dynamics (CFD) for the air with a two-way air-particle interaction coupling term. The effects of air and particle properties (size, density, size distribution, cohesion etc.) on …
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Resolution of grain scale interactions using the Discrete Element Method
… investigating granular systems is the Discrete Element Method (DEM). Nearly all implementations of the DEM, however, use spheres to represent particles despite mounting evidence showing that shape at multiple scales (sphericity, angularity, and friction) plays a role in granular …
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Process systems engineering of continuous pharmaceutical manufacturing
… downstream pharmaceutical manufacturing systems. Discrete element method (DEM) simulations were used to develop novel insights into the mechanism of mixing for continuous blending of cohesive pharmaceutical powders and to examine the effects of particle properties, blender design and operating …
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Probability based models for the power draw and energy spectra of a tumbling mill
… Emission Particle Tracking (PEPT) and the Discrete Element Method (DEM) are used to develop probability based models for the power draw and collision energy spectra of a tumbling mill. Experiments are conducted using dry spherical glass bead charge in a laboratory scale tumbling mill, which …
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Numerical and experimental evaluation of the erodibility of particle packings with surface treatments and spring reinforcements using the discrete element method
… of physical flume experiments and the discrete element method (DEM). Packings composed of spherical glass particles, with and without surface treatments and angled at two different slopes, were tested experimentally and simulated numerically under surficial flow conditions. The surface …
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DEM-based numerical simulation of drainage plows and dewatering trenchers
Discrete Element Method (DEM) numerical simulations are carried out to perform a simulation-based parametric optimization of drainage plow geometry based on the predicted forces, pressure distributions and topsoil placement. Two types of plows, parallel link (PL) and double link (DL), operating in …
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Deriving and verifying a general granular locomotion scaling law
… Often, modeling these interactions requires discrete particle simulation methods, such as the Discrete Element Method (DEM), a process that is prohibitively computationally intensive for large systems. The difficulty of modeling granular materials has posed great difficulty for design …
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Investigation of Toughening Mechanisms in the Fracture of Asphalt Concrete Using the Clustered Discrete Element Method
… continuous motion of new 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 …
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CFD Simulations of Chemical Looping Combustion in a Packed Bed and a Bubbling Bed Fuel Reactor
… from beginning to the steady combustion state, Discrete Element Method (DEM) is employed to determine the coordinate & velocity of every particle individually. The entire process is simulated reasonably well when compared to the experiment.</p>
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Characterization and numerical simulation of the microstructural and micromechanical viscoelastic behavior of oil sands using the discrete element method
… 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. This research is a pioneering effort towards contributing to the existing body of knowledge in oil …
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Characterization and recyclability of 304L stainless steel powder for use in the selective laser melting process
… to a subset of additive manufacturing (AM) methods which successively melts and solidifies selected regions within a powder bed on a layer-by-layer basis to construct components directly from computer-aided design files. Laser Powder-Bed Fusion (L-PBF) is a process among the powder-bed …
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Developing and evaluating a partition-cavity solar thermochemical reactor for syngas production via computational fluid dynamics
… of computational fluid dynamics (CFD) and discrete element method (DEM). The reduction rate was studied based on the catalyst textual properties and the reaction condition. The results revealed that the increase of catalyst specific surface area and the rise of the catalyst temperature are …
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