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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 716 for “"Numerical models"”.
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Numerical Models for Compression Mold Filling
Several models are developed using the finite element method to study the filling pattern of compression molding. The effects of charge size, temperature-dependent viscosity, mold temperature, and mold closing speed on the velocity and temperature distributions and flow front advancement are …
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Local Numerical Models of Turbulent Accretion Flows
Magnetohydrodynamical (MHD) turbulence induced by magnetorotational instability (MRI) is the most promising candidate for driving angular momentum transport in accretion disks. This work provides a comprehensive study of MHD turbulent accretion flow using shearing box simulations.
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Numerical models of Hall thruster ionization oscillations
… steady and unsteady Hall thruster models, as well as a generalized sheath model are then developed, and the effects of the parameters that determine stability on the thruster's operating conditions are determined.
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Simple numerical models for fluvially-dominant river deltas
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2020-08-01
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Hierarchical wavelet-based numerical models for digital data
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1996.
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Applications of numerical models for rough surface scattering
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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The Automation of Numerical Models of Coseismic Tsunamis
The use of tsunami models for applications of 'now-casting', which is the prediction of the present and near future behavior, has limited exploration, and could potentially be of significant usefulness. Tsunamis are most often caused by earthquakes in subduction zones, which generates coupled …
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Using CBR to improve the usability of numerical models
… we show that CBR systems can be constructed from numerical models, so as to improve their usability. It is shown that CBR models may be queried in a flexible manner, and that the user may formulate queries consisting of constraints over both “input” and “output” variables of the numerical model. …
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Numerical models of phosphate esters in the Chattahoochee River
A numerical model was constructed to assess the magnitude of organophosphoric acid triester sinks in the Chattahoochee River and to identify concentration patterns downstream of point source discharges. The model was built using WASP5 and supporting software packages. The model simulated mass …
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Numerical models for rotating Lagrangian particles in turbulent flows
… introduces high fidelity Lagrangian particle models to account for the rotational effects of particles in complex turbulent flows. Part of the focus of the research is to provide novel techniques to model particle-surface collision induced rotation as well as develop correlations for forces …
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Numerical models for the simulation of Raman amplification in plasma
… involves many competing nonlinear processes, numerical simulations are often used to better understand the associated complex behaviour. Different models offer different advantages and limitations. This work presents a study of three distinct numerical models: a particle-in-cell (PIC) code, a …
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High-resolution numerical models for damage assessment in composite materials
… was undertaken within Work Package 3 (WP3) - “Numerical modelling of impact and crush behaviour of composite structures”, where the focus was on the high-fidelity modelling of energy absorbing mechanisms of carbon fibre-reinforced polymer (CFRP) composite structures, under a variety of …
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Vibrations in lightweight structures - Efficiency and reduction of numerical models
… is to develop such tools by means of numerical models. Accurately assessing the dynamic behaviour of multi-storey wood buildings requires use of models representing the geometry in considerable detail, resulting in very large models which easily exceed the limits of computer capacity, …
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Transient analyses of viscoelastic materials with applications to numerical models
… Model. In the second part, some alternative models to commercial finite element approaches are explored. A simple model of damping in viscoelastic layers is presented to illuminate the role of viscoelasticity in acoustic absorption. A new solver type for time-domain viscoelastic finite …
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Accurate Cylindrical-Coordinate Numerical Models For The Analysis Of Hydrologic Tests
… do not match real world conditions. Although numerical models more closely match reality, they either ran too slowly to be practical or lacked accuracy because of coarse grid spacing and large time steps. Advances in computer power over the last few decades now allow for accurate, fast …
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Numerical models of new HF shipboard communication antenna systems for improved survivability
… system. This thesis investigates computer numerical models f or improving the time that an HF shipboard combat survivable antenna system can endure in a given environment. The future generation of ships will have low profile combat survivable antennas; an interim solution for present ships …
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Submarine Groundwater Discharge in the Southern Chesapeake Bay: Constraints From Numerical Models
… desired transect, and outputs a cross-sectional numerical domain for a series of steady-state calculations solved by a USGS program called SUTRA. SUTRA’s hybrid finite element and finite difference method computes buoyancy-driven flow of variable-density groundwater, solves the coupled solute …
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Differential and numerical models of hysteretic systems with stochastic and deterministic inputs
Many deterministic models with hysteresis have been developed in the areas of economics, finance, terrestrial hydrology and biology. These models lack any stochastic element which can often have a strong effect in these areas. In this work stochastically driven closed loop systems with hysteresis …
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Numerical models for simulating hydrogen diffusion and embrittlement in high strength steels
Esta tesis presenta y discute la modelización de la difusión de hidrógeno en metales como un primer paso para predecir y mitigar la fractura asistida por hidrógeno. La fragilización por hidrógeno es un fenómeno mediante el cual se degradan los metales y las aleaciones, siendo habituales los fallos …
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