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 23 for “"Numerical Codes"”.
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An assessment of software packages as applied to particles in a rotating mill
… ABAQUS and Particle Flow 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 …
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A Study of Inhomogeneities and Anisotrophies In Superconductors via Ginzburg-Landau Type models
… We develop robust, accurate, and efficient numerical codes and apply them to numerous studies of how vortex motions are affected by the various mechanisms mentioned above. We also examine some analytical aspects of type-II superconductors under the influence of thermal fluctuations.
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Analysis of phased array antenna radiation patterns including mutual coupling
… including mutual coupling, using modem numerical electromagnetic analysis codes, thus allowing verification of the array analysis methods presented here. The results are general, however, and may be applied to arrays of any type of element. The array patterns computed using the classical …
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A beam test for adhesives
… specimen geometry prior to testing. Simple numerical codes are proposed to facilitate this purpose.
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Connectivity-dependent Wigner delay times in molecular-scale nanostructures
… are developed and these are implemented in new numerical codes. The relationship between the phase of S-matrix elements and Wigner delay times is also elucidated. I consider the scattering problem in a tight-binding lattice, as a simple way to understand the relation between M-functions and …
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Error Transport Equations for Unsteady Discontinuous Applications
… contingent upon the underlying modeling and numerical errors. A key aspect of ensuring simulation reliability is the accurate quantification of discretization error (DE), which is the difference between the simulation solution and the exact solution in the physical world. This study addresses …
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Stagnation-point flow past a vertical stretching or shrinking sheets in a nanofluid with slip effect
… Resulting non-linear ODEs are solved numerically using the shooting method and the numerical codes have been developed using software known as Maple. The effects of various emerging parameters such as Prandtl number, Pr, Lewis number, Le, the stretching/shrinking parameter, 6 , …
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Graphics Processing Unit Acceleration Of Computational Electromagnetic Methods
… to the CPU in the creation and execution of the numerical codes that are often relied upon in to perform simulations in computational electromagnetics. While originally designed purely to display graphics on the users monitor, GPU's today are essentially powerful floating point co-processors that …
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Coupled Molecular Dynamics and Finite Element Methods for the simulation of interacting particles and fields
… (MD) we can regroup a variety of approaches and numerical codes, whereas the commonalities are: 1) the atomistic (or nuclear) resolution (i.e. particles are atoms or nucleons), 2) the force derivation, starting from the systems configuration, through semi-classical (also called semi-empirical) or …
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Brane cosmology in string/M-theory and cosmological parameters estimation.
… Part I, after developing two highly successful numerical codes, I apply them to study the holographical dark energy model and LCMD model with curvature. By fitting these models with the most recent observations, I find various tight constraints on the parameters involved in the models. In part …
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Micro-structural modifications of semiconductor systems under irradiation: experiment, modeling and simulation analysis.
… been originally formulated and implemented in numerical codes, which belong to the class of the continuum (based on Partial Differential Equations) and atomistic (Kinetic Monte Carlo) approaches for kinetic simulation of the dopant-defect system under laser irradiation. Continuum models will be …
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Verification and Validation of Magnetohydrodynamics Simulations of Electrically Exploded Conductors
… for future experiments. Formal testing of the numerical codes is necessary and broken into two categories: verification and validation. Verification tests how precisely a code solves the physics model implemented in it while validation describes how accurate the physics model is at capturing …
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Problem solving environments for the numerical solution of partial differential equations
The complexity and sophistication of numerical codes for the simulation of complex problems modelled by partial differential equations (PDEs) has increased greatly over the last decade. This makes it difficult for those without direct knowledge of the PDE software to employ it efficiently. Problem …
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Modelling, design and analysis of innovative thermal energy storage systems using PCM for industrial processes, heat and power generation
… part: the first part presents the development of numerical models of the latent heat thermal energy storage (LHTES) devices. Different models are developed by means of a 2D and 3D numerical simulation codes specifically implemented in the COMSOL Multiphysics environment. Design of LHTES requires …
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Synthesis of dual offset Gregorian reflector antennas with very low cross polarization under practical constraints for mass production
… in this dissertation were implemented as numerical codes referred to as DORA (Dual Offset Reflector Antenna Synthesis Package). DORA is a complete suite of codes for the synthesis of nonconventional, low-cost dual offset Gregorian reflector antennas with very low cross polarization. …
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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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Multidimensional modeling of the thermal and flow regime in the western part of the Molasse Basin, Southern Germany
… Basin (SW Germany). For this purpose different numerical codes are applied. For an optimal geometrical representation of the basin geometry it was necessary to develop a coordinate transformation method. This work is presented in the first part of the thesis. Many popular groundwater modeling …
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Well-posedness and convergence of cfd two-fluid model for bubbly flows
… However, this is not the case with the TFMs in numerical codes, which can be shown to have complex eigenvalues due to incompleteness and hence are ill-posed as initial value problems. A common approach to regularize an incomplete TFM is to add artificial physics or numerically by using a coarse …
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Chemodynamical Properties of Simulated Late-type Galaxies
… large suite of simulations, sampling a range of numerical codes (particle- and grid-based, in addition to classical Galactic Chemical Evolution (GCE) models), each with different treatments of star formation, energy feedback, and assembly histories, was employed. The analysis focussed on both the …
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Numerical Model Studies of Enhanced Geothermal Systems
… a long life span of the reservoir. It is where numerical simulation models are used as reservoir performance predictive tools to find these parameters. A benchmark problem for the Fenton Hill Phase I EGS was numerically simulated as the first task with four runs contemplating a single planar …
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