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 20 of 42 for “"3D simulations"”.
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Reproduction of auroral cyclotron emission mechanisms in laboratory experiments and 3D simulations
… to a cyclotron maser instability. KARAT 2D & 3D particle in cell (PiC) simulations were used to enhance the understanding of results from a laboratory experiment built to reproduce the mechanisms of AKR generation. In these experiments the kilometric radiation was scaled to microwave …
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Replaying the past: establishing a 3D simulation methodology for the analysis of roofing and alignments in Neolithic Malta
3D simulations, or digital experiments based on 3D models, offer new possibilities for archaeological investigation. Originating in the field of 3D reconstruction (here approximation), 3D simulations consist of virtual environments that act as proxies for an archaeological context, allowing the …
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Real-time collaboration for a block-based programming environment
… platform for programming and visualizing 3D simulations and games. It has a custom programming language, a compiler, and graphical user interface for shows systems implemented with the programming language. Unlike most programming languages, however, StarLogo Nova uses a block-based …
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Improving the ability of StarLogo Nova users to save and organize their work
… environment that allows users to create 3D simulations and games. Typical user tasks include creating new projects and galleries, organizing projects into galleries, updating gallery settings, viewing and editing projects, and updating user account settings. This thesis uses usability …
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Uncalibrated TCAD methodology for analysis of ESD protection devices
… computation complexity and accuracy, 2D vs. 3D simulations, is examined in detail. TCAD simulation results for the GGNMOS in 32 nm CMOS technology is compared with published measurement results for methodology validation. The established TCAD methodology is then applied to ESD protection …
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Data analytics and visualizations for StarLogo Nova block programming platform
… a block-based programming platform for creating 3D simulations and games. This tool collects block data from the platform and visualizes the data into 15 different charts, showcasing both high-level and the more detailed aspects about the data. As a way to investigate how to improve StarLogo such …
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Modeling, simulation and experimental study of the UNM low power reltron
… models of, and performing particle-in-cell (PIC) simulations and conducting experiments on the low power reltron. The modules in the reltron tube can be described using mathematical models. We first analyze the minimum beam potential required to self-excite the modulating cavity. We obtain the …
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Three-Dimensional Simulations of the Behaviour of Layered Soils under Simple Shear
… and layered soils under simple shear using 3D numerical analyses, focusing on the influence of a thin clay layer within sandy soils on strength and liquefaction resistance. Comparison of 2D and 3D simulations of direct simple shear (DSS) tests highlights qualitative differences and internal …
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Computational Modeling and Simulations of Hydrodynamics for Air-Water External Loop Airlift Reactors
… within the reactors, computational modeling and simulations of hydrodynamics for air-water external loop airlift reactors were investigated. The gas-liquid flow dynamics in a bubble column were simulated using a FORTRAN code developed by Los Alamos National Laboratory, CFDLib, which employs an …
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High Order Immersed Finite Difference Methods for Complex Domains with Moving Boundaries and Interfaces
… resolution, making them a promising tool for 3D simulations with tight error tolerances. However, the majority of available high order immersed methods have been numerical experiments developed for stationary 2D geometries and simple PDEs. In this thesis we demonstrate that high order immersed …
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Three-Dimensional Fluid Simulations of Mid-Latitude Ionospheric Processes with Hybrid Chebyshev/Fourier Pseudo-Spectral Methods
… A newly developed three-dimensional (3D) electrostatic fluid model extends these investigations to capture the behavior and evolution of ionospheric plasma clouds. Historically, these artificial plasma clouds have served as a case study for understanding irregularity evolution in the …
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Examining the response of the Martian atmosphere to increases in different portions of the electromagnetic spectrum during solar flares
… Model (M-GITM) to create 16 distinct 3D simulations of the Martian atmosphere, and the response of the atmosphere was examined. When the regions 30-125 nm, and 50-100 nm were increased there was an average increase in neutral density of 0.11% and 0.035%, respectively, for each …
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Multifluid Kelvin-Helmholtz instability in weakly ionised astrophysical plasmas
… some characteristic length scale. Large-scale 3D simulations allow us to begin to understand the resulting dynamical differences in both the jet propagation and the structural evolution of the magnetic fields.
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Physics and learning based computational models for breaking bow waves based on new boundary immersion approaches
… to study breaking bow waves through 2D+T and 3D simulations. The 2D+T computations compare well with experiments and breaking bow wave metrics are shown to be highly sensitive to the ship geometry. 2D+T breaking bow wave predictions are compared quantitatively to 3D computations and shown to …
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Inverse problems in elliptic charged-particle beams
… highly laminar elliptic beam. Three-dimensional simulations and tolerance studies are performed, confirming the theoretical predictions that a near-ideal beam can be produced. Focusing systems are described for elliptic beams in coasting, accelerating, and compressing regions with analytic …
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Laboratory Experiments of High-Energy-Density Shocks in Magnetized Supersonic Plasma Flows
… forms ahead of the probe and exhibits a fully 3D structure, with a larger opening angle in the plane parallel to the magnetic field, than in the plane normal to it. We use the shock Mach angle to determine the upstream Mach number (5 − 8) of the flow. We also introduce a novel technique to …
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Generalized Navier-Stokes equations for active turbulence
… lattices in 2D and chiral Beltrami fields in 3D. Numerical simulations for a plane Couette shear geometry predict a low viscosity phase mediated by stress defects, in qualitative agreement with recent experiments on bacterial suspensions. Considering the active analog of Stokes' second …
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Three-Dimensional Loss Effects of a Solenoidal Inductor with Distributed Gaps
… disparities in losses between 2D-based design simulations and a 3D realization of solenoidal inductors featuring distributed gaps. The inductor geometry entails a solenoidal copper winding enveloped by sintered ferrite rings and end caps, with the air gap required for energy storage distributed …
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Advanced Methods for Generating and Processing Simulated Radar Sounder Data for Planetary Missions
… in planetary exploration). In this context, data simulations are necessary to support the design of the radar, the development of the related processing chain, and the definition of algorithms for the automatic analysis of data. However, state-of-the-art RS simulation methods are characterized by …
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Internal hydraulic jumps with upstream shear
… results are also compared to 2D and some 3D numerical simulations of the full Navier-Stokes equations, which allow continuous velocity and density distributions. The solution space of idealized jumps with small upstream shear is identified using twolayer theories, which shows that upstream …
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