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 421 for “"Numerical Modelling"”.
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Numerical Modelling of Plasmonic Waveguides
… there is an urgent need to have an accurate numerical model for plasmonic structures.<br/><br/>Numerical simulations play an important role for the design and modeling of plasmonics. In this thesis, the conventional full vectorial finite difference method (FVFDM) and a nine node based full …
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Numerical modelling of ocular accommodation process
… finite element method (FEM) and a purpose-made numerical ray-tracing code in order to provide a thorough understanding of the accommodation process and pertinent changes in the lens. Secondly, given the fact that the lens material possesses both mechanical and optical gradient properties, the …
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Numerical Modelling of Corrugated Paperboard Boxes
… is often limited by the computational burden of modelling detailed flute geometries and by the difficulty of representing crease regions, where local bending and crushing strongly influence global box behaviour. This study hypothesises that accurate and efficient full box simulation can be …
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Numerical modelling of low temperature plasma
… This is achieved by applying both analytic and numerical models. Low temperature plasmas are found in both technological and astrophysical contexts. Three different situations are investigated: an instability in electronegative plasmas; electron avalanches during plasma initiation; and a …
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Numerical modelling of dilatant rock joints
Aluminium forms a highly neurotoxic complex with maltol (3-hydroxy-2-methyl-4H-pyran-one). The stability of this complex has been determined using glass-electrode potentiometry. Owing to the effect on nuclear relaxation behaviour, paramagnetic contrast agents have immense diagnostic potential and …
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Numerical modelling of the aluminium extrusion process
… proceeds to describe and analyse the integrated modelling of the process necessary to introduce the user introduction of the equations necessary to produce a comprehensive analysis of the material structural problems. This includes the cellular automata teclu-iiques. Various complex extrusion …
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Numerical modelling of dispersion managed soliton transmission
This thesis presents the results of numerical modelling of the propagation of dispersion managed solitons. The theory of optical pulse propagation in single mode optical fibre is introduced specifically looking at the use of optical solitons for fibre communications. The numerical technique used to …
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Advanced Numerical Modelling of Bulk Superconductor Magnetisation
… The focus of this PhD is therefore to use a modelling-first approach to investigate practical methods of trapping magnetic fields within bulk superconductors, with the goal of providing deeper insight into the techniques which may enhance their magnetisation. One particular focus of this …
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Numerical modelling of thermoacoustic engines and coolers
… present. This thesis presents a comprehensive numerical investigation of loop thermoacoustic engine and cooler systems, utilising high-fidelity time-domain computational fluid dynamics (CFD) simulations. The research establishes a robust and detailed modelling framework capable of capturing …
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Numerical modelling of the Oldroyd-B fluid
The purpose of this thesis is to develop a 3D finite element model of the Oldroyd-B fluid for use in a complex geometry. The model is developed in deal.ii, which is a C++ finite element library. In addition to the standard finite element approach for the momentum equation, the discontinuous …
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Numerical modelling of an oscillatory baffled column
The aim of this project was to develop a numerical model to resolve the flow field in a general OBC. This model can then later be modified to be used to model the more complex aBC that is presently being experimentally tested by the Mineral Processing Research Unit at the University of Cape Town. …
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Numerical modelling of geothermal borehole heat exchanger systems
… attention. This work is concerned with the modelling of borehole heat exchangers (BHEs), the commonest form of ground heat exchangers found in GSHP systems. Their careful design is critical to both the short timescale and long timescale performance of geothermal heat pump systems. Unlike …
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Numerical modelling of photonic crystal based switching devices
… degree of precision, we have to rely on accurate numerical modelling to characterise these devices. There are several numerical modelling techniques proposed in literature for the purpose of simulating optical devices. Such techniques include the Finite Difference Time Domain (FDTD), the Finite …
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Multi phase numerical modelling of thickening and sedimentation
… find applications in many areas of industry. A numerical model has been developed to simulate the settlement of non-flocculated particulate suspensions in batch sedimentation. The non-flocculated mode of the model is extended to predict the performance of a continuous gravity thickener. The …
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Numerical Modelling of Geomorphological Processes in Estuarine Waters
Numerical modelling of geomorphological processes in rivers, estuaries, harbours and coastal waters is an efficient means of predicting bed level changes for further use in planning the maintenance and management of these areas. Nowadays, quasi-3D models are increasingly popular, particularly with …
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Numerical modelling of the coastal ocean off Tanzania
… coastal ocean off Tanzania, the Regional Ocean Modelling System (ROMS) was employed to model the coastal ocean off Tanzania over the domain of 5°N-15°S and 38-55°E. It was integrated for ten years with monthly mean Comprehensive Ocean and Atmosphere Data Sets (COADS) winds and heat fluxes. …
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Numerical modelling of transport of pollutant through soils
Prediction of subsurface migration of contaminant through soils involves analyses of unsaturated and saturated flow of water and advective dispersive transport of contaminant species. A finite element model is developed here for such an analysis. It is based on the transient nonlinear Richard's …
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3D numerical modelling and manipulation of a shoe last.
… data has been proposed and evaluated. A numerical methodology for onscreen visualisation with application of a new scheme of segmentation of the last surface and further manipulation of the last elements in order to create new last styles have been developed. In order to achieve this, the …
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