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 114 for “"magnetohydrodynamics"”.
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Some aspects of magnetohydrodynamics
… the study of which is usually known as Magnetohydrodynamics (MHD), occur on a galactic, planetary or laboratory length scale; however in this thesis we concentrate on those phenomena which can be reproduced in the laboratory. In chapter 2 we study the laminar flow of uniformly …
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Thermoelectric magnetohydrodynamics in dendritic solidification
The focus of this work is to investigate the effects of applying an external magnetic field to a solidifying liquid metal melt. The principle is that thermoelectric currents that are naturally inherent to solidification processes will interact with this magnetic field, resulting in a Lorentz force. …
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Shear flow instabilities in stratified magnetohydrodynamics
Shear flows are ubiquitous in nature and man-made settings and they play a fundamental role in the mixing and transition to turbulence of fluid flow. Shear flow instabilities of electrically-conducting fluids play a critical role in the dynamics of astrophysical objects, such as planets, stars, …
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Black Hole Astrophysics : Magnetohydrodynamics on the Kerr Geometry
… physics in the regime of General Relativistic Magnetohydrodynamics (GRMHD). The behavior of non-radiative accretion flows and outflows on the Kerr space-time is analyzed. Basic equations of conservative GRMHD and aspects of numerical schemes are presented. Relativistic codes and astrophysical …
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Magnetohydrodynamics in the Inner Regions of Protoplanetary Discs
… final part of this thesis departs from global magnetohydrodynamics and focuses on the stability of these vortices. Motivated by their small pre-merger aspect ratios, we conduct high-resolution unstratified hydrodynamic simulations to study the elliptical instability in Rossby wave-induced …
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A finite element method for the fully-coupled magnetohydrodynamics
This thesis presents a finite element method for the solution of three-dimensional magnetohydrodynamic flows. The physics of such flows is governed by the Navier-Stokes equations, which are extended to account for the Lorentz forces, and by Maxwell equations from which the magnetic induction …
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Factors Affecting Redox Magnetohydrodynamics for Flow in Small Volumes
<p>Lab-on-a-chip technologies offer the possibility of developing analytical devices that are low-cost, portable, disposable, fast, and operable by non-technical personnel. Such devices require automated methods to manipulate ultra-small volumes (picoliters) of samples and solution, including …
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The effects of flow on resistive instabilities in magnetohydrodynamics
Resistive instabilities in MHD have been understood as one of the most important problems in astrophysical and controlled thermonuclear fusion research during the past four decades. This class of instability results from the introduction in the ideal MHD equations of a small but finite electrical …
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Verification and Validation of Magnetohydrodynamics Simulations of Electrically Exploded Conductors
… pulses through an initially solid conductor. Magnetohydrodynamics (MHD) simulations are used to interpret results of these pulsed power systems and design targets for future experiments. Formal testing of the numerical codes is necessary and broken into two categories: verification and …
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A Meshless Method for Magnetohydrodynamics and Applications to Protoplanetary Disks
… algorithm for simulating the equations of ideal magnetohydrodynamics and other systems of differential equations on an unstructured set of points represented by sample particles. Local, third-order, least-squares, polynomial interpolations (Moving Least Squares interpolations) are calculated from …
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Applications of Lie Group Methods to the Equations of Magnetohydrodynamics
The invariance properties of various sets of magnetohydrodynamic (MHD) equations are studied using techniques from the theory of differential forms. Equations considered include the ideal MHD equations in different geometries and with different magnetic field configurations, the MHD equations in …
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Simulation of magnetohydrodynamics turbulence with application to plasma-assisted supersonic combustion
The main objective of this thesis is to develop a comprehensive model with the capability of modeling both a high Reynolds number and high magnetic Reynolds number turbulent flow for application to supersonic combustor. The development of this model can be divided into three categories: one, the …
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Extended general relativistic magnetohydrodynamics: Formulation and application to black hole accretion
… a theory, called Extended General Relativistic Magnetohydrodynamics (EMHD), that accounts for up to second order anisotropic dissipative effects. Using detailed linear analysis, we show that the model is conditionally hyperbolic, causal and stable, and does not suffer from pathologies inherent …
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Investigation of the GEM MPD thruster using the MACH2 magnetohydrodynamics code
This work investigated using the MACH2 plasma simulation code in replicating the results of previous experimental work on the gallium electromagnetic (GEM) thruster. MACH2 was also used to examine possible changes to the GEM thruster that could improve the performance of the actual thruster. …
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General relativistic radiation magnetohydrodynamics, with applications to black hole accretion disks
… of numerical methods for general relativistic magnetohydrodynamics (GRMHD). However, even the local details of MRI-driven turbulence simulations are still not completely understood. Along the way, this work considers a central issue with modeling the MRI: whether the resulting stress is …
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Solving the system of Radiation Magnetohydrodynamics : for solar physical simulations in 3d
… scheme for solving the equations of radiation magnetohydrodynamics in two and three space dimensions. Among other applications this system is used to model the plasma in the solar convection zone and in the solar photosphere. It is a non--linear system of balance laws derived from the Euler …
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Merging black hole binaries in gaseous environments: simulations in general-relativistic magnetohydrodynamics
… moving puncture gauge conditions and handle the magnetohydrodynamics via a high-resolution shock-capturing (HRSC) scheme. In the limit of negligible gas angular momentum, we consider both “binary Bondi accretion” in which the binary is at rest relative to the ambient gas cloud, as well as “binary …
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