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Dissertations / Theses on the topic 'Numerical modelling'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Lismanis, Brandon. "Numerical Modelling of Dam Breaching." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/24004.

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Until recently, research has been scarce in the field of physical modelling of dam breaching. Over the past few years, teams from the University of Ottawa, Canada, Delft University of Technology, Netherlands, and HR Wallingford, United Kingdom have worked on several physical models to help determine how various dam breaching characteristics vary due to changes in dam geometry and geotechnical properties. The purpose of this project is to use these new experimental data sets to compare and validate the applicability range of two existing pieces of software, MIKE11-DB and BREACH developed by the

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2

Bayliss, Martin. "The numerical modelling of elastomers." Thesis, Cranfield University, 2003. http://hdl.handle.net/1826/87.

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This thesis reports onreview and research work carried out on the numerical analysis of elastomers. The two numerical techniques investigated for this purpose are the finite and boundary element methods. The finite element method is studied so that existing theory is used to develop a finite element code both to review the finite element method as applied to the stress analysis of elastomers and to provide a comparison of results and numerical approach with the boundary element method. The research work supported on in this thesis covers the application of the boundary element method to the s

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3

Nejad, Mehdi Afsari. "Numerical modelling of inclined seams." Thesis, University of Nottingham, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263425.

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4

Hudson, Justin. "Numerical techniques for morphodynamic modelling." Thesis, University of Reading, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394022.

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5

Lee, Adrian Michael. "Numerical modelling of stratospheric ozone." Thesis, University of Cambridge, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.627432.

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6

Patterson, Robert Iain Arthur. "Numerical modelling of soot formation." Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.613176.

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7

Yin, Kek K. "Numerical modelling of agglomerate degradation." Thesis, Aston University, 1992. http://publications.aston.ac.uk/14293/.

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In the processing industries particulate materials are often in the form of powders which themselves are agglomerations of much smaller sized particles. During powder processing operations agglomerate degradation occurs primarily as a result of collisions between agglomerates and between agglomerates and the process equipment. Due to the small size of the agglomerates and the very short duration of the collisions it is currently not possible to obtain sufficiently detailed quantitative information from real experiments to provide a sound theoretically based strategy for designing particles to

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8

Mate, Marc. "Numerical Modelling of Wood Pyrolysis." Thesis, KTH, Skolan för kemivetenskap (CHE), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-206852.

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In this project, a numerical model describing the reaction mechanism and the mass and energy transport in wood pyrolysis is studied. The applicability of the model in predicting actual biomass pyrolysis assessed by comparing the model to TGA experimental measurements. The comparison to experiments is done in relation to the mass loss characteristics of chips of varying sizes. The mass loss is of interest as it is a variable necessary in the coupling of reactor and particle models. Three reaction models were simulated and results compared to experimental data, namely, the reaction model develop

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9

Juřena, Tomáš. "Numerical Modelling of Grate Combustion." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-233992.

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Předkládaná práce je zaměřena na numerické modelování spalování tuhých paliv na roštu metodami výpočtové dynamiky tekutin (CFD). Jelikož výsledky CFD simulací roštového spalování závisí na kvalitě vstupních dat, která zahrnují i údaje o teplotě, hmotnostním toku a chemickém složení spalin vystupujících z lože, pozornost je věnována především procesům, probíhajícím v loži během spalování na roštu. Velká část práce je věnována vývoji spolehlivého modelu spalování v sypaných ložích, jelikož může napomoci zkvalitnit výsledky simulací i rozšířit znalosti principů spalování tuhých paliv v sypaných l

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10

Lu, Zhengxin. "Modelling geotechnical uncertainty using numerical modelling techniques : Kuldip Narbheshankar Modha." Thesis, University of Nottingham, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.446386.

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11

Matteucci, Simona. "Numerical Modelling of a Flameless Combustor." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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Flameless combustion can be adopted as a low-emission combustion regime in the aviation sector, which is one of the biggest contributors to NOx emissions and is expected to grow in the near future. Nevertheless, several issues must be solved before any practical applications. Effective design procedure must deal with either combustion or heat transfer phenomena occurring at extremely low—temperature conditions. To this aim, experimental and numerical analyses focused on the characterization of fuel/oxidant behaviour are strongly needed and represent an essential step for further development.

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12

Pérez, Foguet Agustí. "Numerical modelling of complex geomechanical problems." Doctoral thesis, Universitat Politècnica de Catalunya, 2000. http://hdl.handle.net/10803/6703.

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La tesis se centra en el desarrollo de técnicas numéricas específicas para la resolución de problemas de mecánica de sólidos, tomando como referencia aquellos que involucran geomateriales (suelos, rocas, materiales granulares,...). Concretamente, se tratan los siguientes puntos: 1) formulaciones Arbitrariamente Lagrangianas Eulerianas (ALE) para problemas con grandes desplazamientos del contorno; 2) métodos de resolución para problemas no lineales en el campo de la mecánica de sólidos y 3) modelización del comportamiento mecánico de materiales granulares mediante leyes constitutivas elastoplás

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13

Pritchard, Mark Anderson. "Numerical modelling of large scale toppling." Thesis, University of British Columbia, 1989. http://hdl.handle.net/2429/27991.

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The principle purpose of this research is to resolve the mode of failure of the Heather Hill landslide, one of several well defined failures in the Beaver Valley, Glacier National Park, British Columbia. Field work led to the preliminary conclusion that some type of toppling process contributed to the failure. A literature review of toppling revealed that large scale topples have never been quantitatively assessed, and that currently used analytical techniques are not adequate. Consideration of alternative numerical techniques resulted in the distinct element method being selected as the best

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14

Lindgren, Jonas. "Numerical modelling of district heating networks." Thesis, Umeå universitet, Institutionen för fysik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-143896.

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District heating is today, in Sweden, the most common method used for heating buildings in cities. More than half of all the buildings, both commercial and residential, are heated using district heating. The load on the district heating networks are affected by, among other things, the time of the day and different external conditions, such as temperature differences. One has to be able to simulate the heat and pressure losses in the network in order to deliver the amount of heat demanded by the customers. Expansions of district heating networks and disrupted pipes also demand good simulations

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15

Kelly, Liam. "Numerical modelling of supra-aural headphones." Thesis, University of Salford, 2010. http://usir.salford.ac.uk/26754/.

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Headphone design is facilitated by modelling and has traditionally been carried out using lumped parameters, which are efficient but limited to low frequencies. In this investigation a wave based approach is taken using finite elements to introduce a headphone modelling tool which has the capability to predict high frequency harmonic components in the acoustic field. The development of these increased bandwidth headphone modelling capabilities is carried out over 3 discrete design phases involving 2D axisymmetric and 3D models with the key components being the porous cushion, the headphone dri

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16

Ichim, Ionut P., and n/a. "Advanced numerical modelling in dental research." University of Otago. School of Dentistry, 2008. http://adt.otago.ac.nz./public/adt-NZDU20080605.133323.

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The understanding of the masticatory apparatus including its functional and structural relationship with other components of the cranium increasingly requires an interdisciplinary approach. Recently, "traditional biological sciences" such as anatomy, comparative biology, anthropology and evolution have increasingly meshed with elements from other domains, such as mechanical engineering and material sciences, which has resulted in new and exciting paradigms to be explored. This is particularly true in the field of craniofacial biomechanics yet there are still many unexplored issues and numerous

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17

Benko, Boris. "Numerical modelling of complex slope deformations." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq24004.pdf.

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18

Kettner, Fleur. "Numerical modelling of flow over spillways." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for vann- og miljøteknikk, 2010. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-12624.

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The spillway of Sarpfossen hydropower plant has been studied numerically and experimentally. The physical model was built in the Vassdragslaboratoriet at the Norwegian University of Science and Technology, NTNU. The model consists of the Sarpfossen dam and the river Glomma upstream of the dam. On the spillway crest are three gates installed - two flap gates and a sector gate. In addtion is further upstream of the dam a bridge for cars and trains. Two of the bridge piers are fixed in the water and has an influence in the flow pattern. The model was run with a certain discharge and the velocitie

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19

Lanerolle, Lyon Werner John. "Numerical modelling of turbulent compressible flow." Thesis, University of Oxford, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362004.

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20

Jia, Yudan. "Numerical modelling of shaft lining stability." Thesis, University of Nottingham, 2011. http://eprints.nottingham.ac.uk/11924/.

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This research project focuses on the application of numerical modelling methods to rock mechanics problems, combining theoretical, experimental and numerical modelling work. Specifically, practical finite difference modelling approach for analysing shaft lining stability through the Marl and Potash strata at Boulby mine UK has been developed using the commercially available software FLAC2D/FLAC3D (ITASCA 2008). A soft rock Marl occurs close to the bottom of the two deep shafts at the mine. Both shafts concrete linings through this stratum have suffered considerable pressure, which has caused g

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21

MacLachlan, Craig S. "Numerical modelling of low temperature plasma." Thesis, University of Glasgow, 2009. http://theses.gla.ac.uk/911/.

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The intention of this thesis is to gain a better understanding of basic physical processes occurring in low temperature plasmas. 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 phenomenon called the Critical Ionisation Velocity interaction. Industrial plasma discharges with electronegative gases are found to be unstable in certain conditions. Fluctuations i

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22

Hill, Ryan. "Numerical modelling of multi-material interfaces." Thesis, Loughborough University, 2011. https://dspace.lboro.ac.uk/2134/8103.

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Remapping (conservative interpolation), within arbitrary Lagrangian-Eulerian (ALE) schemes, requires the values of the scalar to be interpolated from one computational mesh to another which has differing geometry. Advection methods are typically utilised for the remapping stage, with fluxes being created by overlapping volumes between adjacent elements. In the thesis, a second-order, conservative, sign-preserving remapping scheme is developed utilising concepts of the Multidimensional Positive Definite Advection Transport Algorithm (MPDATA). The basic non-oscillatory and non-oscillatory infini

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23

Saadon, N. M. "Numerical modelling of coastal water movements." Thesis, Swansea University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.638736.

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The shallow water equations have been solved numerically using the Galerkin finite element method. Flow problems which can be classified as one-dimensional and two-dimensional are investigated. Two differing types of integration procedure (Gaussian Quadrature scheme and a mixed quadrature scheme involving both Gaussian Quadrature and Simpson's Rule) are examined to determine the most efficient way of obtaining the finite element solutions. The mixed quadrature scheme is shown to be a faster but less accurate process than the Gaussian scheme. The numerical results from the one-dimensional model

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24

Cheong, T. P. "Numerical modelling of soil-pipeline interaction." Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.597580.

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This thesis investigates the interaction between soil and pipeline in sand subjected to lateral ground loading. The purpose of this study is to improve the structural modelling of buried pipelines; and also aims to produce design guidelines and construct normalised charts which will be of direct benefit to practising pipeline engineers. The research was performed entirely using the finite element (FE) method, and utilised the user subroutine of an advanced constitutive soil model that was implemented in this thesis. The problems examined in this research can be categorised into four main topic

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25

Geraghty, Beth Freya. "Comparative Numerical Modelling of Tsunami Propagation." Thesis, University of Canterbury. Physics and Astronomy, 2006. http://hdl.handle.net/10092/2148.

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This thesis uses numerical simulations to assess the most suitable model type for simulating dispersive and non dispersive tsunami wave propagation over a range of bathymetries. These simulations are presented in two parts. The first part highlights differences between results as predicted by a fully nonlinear Boussinesq model (with its ability to predict dispersion) and a non dispersive, linear or weakly nonlinear model, for simulations of a dispersive wave incident at various idealized bathymetric features. The second part determines the efficacy in a real world application of the Boussinesq

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26

Swindale, Neil. "Numerical modelling of river rehabilitation schemes." Thesis, University of Nottingham, 1999. http://eprints.nottingham.ac.uk/29108/.

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This thesis is based on the application of hydraulic modelling techniques to the study of river rehabilitation schemes. River channelization and rehabilitation techniques are reviewed and the restoration of the River Idle is detailed. The rehabilitation of the Idle, consisting principally of the installation of a number of flow deflectors, forms the basis of the modelling work carried out. Open channel modelling techniques are reviewed and the packages ISIS, HEC-RAS, SSIIM and CFX are applied to the River Idle. Results from SSIIM (two dimensional) and CFX (three dimensional) are validated agai

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27

Hystad, Ida. "Numerical Modelling of Turbulent Boundary Layer." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for marin teknikk, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-26365.

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Most physical problems involving viscous fluid flows are characterized by turbulence where instabilities and large velocity gradients generate fluctuations in the flow field. Towed sonar arrays are exposed to turbulence in the boundary layer formed around the cable. Problems are related to the cable rotating around its own axis due to variations in tension force caused by the towing vehicle. Numerical calculations of a pressure driven flow along a cylinder are performed for the purpose of investigating the turbulent boundary layer around the cable. In this study, the numerical software OpenFOA

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28

Gosling, Peter David. "Numerical modelling of stable minimal surfaces." Thesis, University of Warwick, 1992. http://wrap.warwick.ac.uk/57526/.

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This thesis examines the numerical representation of stable minimal surfaces. In particular, the work presented concentrates on the formulation of a finite element, suitable for the analysis of systems subjected to large strains and large displacements. In order to obtain an understanding of the physical properties of a minimal surface, and to verify the proposed numerical solution algorithms, the surfaces developed by several soap-film models are given. The mechanisms involved in the formation of a soap-film (minimal) surface is summarised. Several types of minimal surfaces are investigated,

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29

Harper, John Stuart. "Analytic cache modelling of numerical programs." Thesis, University of Warwick, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343887.

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30

Shuttle, Dawn Alison. "Numerical modelling of localisation in soils." Thesis, University of Manchester, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.277841.

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31

Heath, D. E. "Geothermal modelling and numerical front tracking." Thesis, University of Reading, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234725.

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32

Rowland, Andrea Jane. "Numerical modelling of subduction zone magmatism." Thesis, University of Liverpool, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266491.

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33

Elkassas, Ahmed Samih Ibrahim. "Numerical modelling of unsaturated soil behaviour." Thesis, University of Exeter, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.436306.

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34

Amir-Shahkarami, Abdolazim. "Numerical modelling of an embankment dam." Thesis, Swansea University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280878.

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35

Daly, Brian R. "Numerical modelling of distillation tray hydraulics." Thesis, University of Bristol, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361074.

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36

Riley, C. J. "Numerical modelling of supercritical fluid extraction." Thesis, Cranfield University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.241841.

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37

Mohd, Taib Aizat Bin. "Numerical modelling of unsaturated tropical slopes." Thesis, University of Newcastle upon Tyne, 2018. http://hdl.handle.net/10443/4153.

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Adapting to climate change is one of the greatest challenges facing engineers. Many studies have been conducted since the 1900s directed at predicting extreme weather events. Changes in global weather patterns, such as temperature and rainfall distributions, can have major economic and societal impacts. One example, addressed in this thesis, is the stability of natural slopes. In Southeast Asia, landslides are common due to the effect of abundant rainfall during the wet monsoon. The local climate in the region is characterised by annual wet and dry seasons, in which the cycle forms an unsatura

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38

Du, Hejun. "Numerical modelling of rotorcraft aeroelastic stability." Thesis, Imperial College London, 1991. http://hdl.handle.net/10044/1/46752.

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39

Mardapitta-Hadjipandeli, Lida. "Numerical modelling of tide-induced circulation." Thesis, University of Birmingham, 1986. http://etheses.bham.ac.uk//id/eprint/4529/.

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A finite difference computational model has been enhanced and refined to simulate tide-induced circulatory flows, with special reference to eddies shed in the lee of headlands and tidal circulation and flushing in narrow entranced coastal basins. The model is of the two-dimensional depth-integrated type and includes a relatively simple "zero-equation" turbulence model. In the turbulence model particular emphasis has been placed on the representation of the free shear layer turbulence, occurring in the mixing zone of eddying flows. This component of turbulent structure has been expressed in ter

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40

Lyras, Konstantinos. "Numerical modelling of superheated jet atomisation." Thesis, Kingston University, 2018. http://eprints.kingston.ac.uk/42093/.

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The aim of this research project is to provide the academic and industrial community with a numerical tool that can be used for describing extreme flow cavitation scenarios and the atomisation process of these multiphase jets in a low-pressure environment. The research lies in the intersection of Numerical Analysis, Applied Physics and programming. From the physical point of view, the project has two different strands: The first is developing a methodology for channel flows due to a rapid pressure drop which is possible to result into various flow regimes inside the channel. The second step is

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41

Abo, Elrish Mohamed Rasmy. "The numerical modelling of fox rabies." Thesis, Brunel University, 2002. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.247493.

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Finite difference numerical methods are developed for the solution system in the biomedical sciences; namely, fox-rabies model. First-order methods and second-order method are developed to solve the fox-rabies equations. The fox-rabies model is extended to one-space dimension to incorporate diffusion. The reaction terms in these systems of partial differential equations contain non-linear expressions. It is seen that the numerical solutions are obtained by solving non-linear algebraic system at each time step, as opposed to solving anon-linear algebraic system which is often required when inte

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42

Snyman, M. F. "Numerical modelling of dilatant rock joints." Doctoral thesis, University of Cape Town, 1991. http://hdl.handle.net/11427/22144.

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Bibliography: pages 107-110.<br>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 have recently received a great deal of attention in the literature. The gadoliniummaltol complex was studied with the view to developing a potential tissue-specific magnetic resonance imaging contrast agent. Because of the interest in medical applications of radioactive

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43

Carson, Nuala. "Numerical modelling of landfast sea ice." Thesis, University of Liverpool, 2014. http://livrepository.liverpool.ac.uk/18773/.

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Landfast sea ice is a recurring seasonal feature along many coastlines in the polar regions. It is characterised by a lack of horizontal motion, for at least 20 days, and its attachment to the coast or seabed. It can form as a result of restrictive geometry, such as channels or embayments, or through the grounding of thick ice ridges which add lateral stability to the ice cover. Due to its stationary and persistent nature, landfast ice fundamentally modifies the exchange of heat and momentum between the atmosphere and ocean, compared with more mobile pack ice. The current generation of sea ice

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44

Yin, Jun. "Numerical modelling of centrifugal casting process." Thesis, KTH, Materialvetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-195650.

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The centrifugal casting process is a common method for manufacturing the tubes, etc. Due to its high temperature and invisible mold, it is really difficult to know the mechanism of molten steel inside the mold. It is important to know the mechanism of the molten steel inside mold, since it will help the manufacturer to know more accuracy of the flow of the molten steel so that it can work for improving the productivity and quality of the products. Casting funnel design is the designed by Åkers for their funnel which will result in different flow behavior. In thesis work, casting funnel design

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45

Schutz, Reinhard. "Numerical modelling of shotcrete for tunnelling." Thesis, Imperial College London, 2010. http://hdl.handle.net/10044/1/5674.

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Shotcrete is a special type of concrete which was invented at the beginning of the 20th century and is nowadays an important support element for tunnels constructed with the New Austrian Tunnelling Method (NATM). Immediately after tunnel excavation shotcrete is sprayed onto the tunnel walls at high pressure in order to provide temporary support. Unfortunately, in the past very little attention has been given to the development of sophisticated material laws for shotcrete, since its design and application was mainly based on experience. However, current design practice, such as that applied in

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46

Löfgren, André. "Numerical ice sheet modelling using FEniCS." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-396571.

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The increase in computational power in the last 20 years has made it feasible to solve the full Stokes equation for ice flow, using finite element methods (FEM). However, the numerical properties of these equations remains largely unknown. This is due to their nonlinear nature, which makes them hard to analyze mathematically. For this reason convergence rate and stability has to be established by performing simulations. In this thesis a 2D ice solver has been developed. The solver was then tested on the ISMIP-HOM benchmarks, in order to assert convergence rates and stability. The solver was de

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47

Vegh, Viktor. "Numerical modelling of industrial microwave heating." Thesis, Queensland University of Technology, 2003. https://eprints.qut.edu.au/37144/7/37144_Digitised%20Thesis.pdf.

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The numerical modelling of electromagnetic waves has been the focus of many research areas in the past. Some specific applications of electromagnetic wave scattering are in the fields of Microwave Heating and Radar Communication Systems. The equations that govern the fundamental behaviour of electromagnetic wave propagation in waveguides and cavities are the Maxwell's equations. In the literature, a number of methods have been employed to solve these equations. Of these methods, the classical Finite-Difference Time-Domain scheme, which uses a staggered time and space discretisation, is the mos

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48

Filippini, Mattia. "Magnetic gears numerical modelling and optimization." Doctoral thesis, Università degli studi di Padova, 2019. http://hdl.handle.net/11577/3425766.

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The main focus of this thesis is to provide efficient modelling and optimization strategies for a certain electro-magnetic device known as magnetic gear. In particular, magnetic, thermal and mechanical models are discussed and the non-linear material models are examined, including permanent magnets demagnetization algorithms and hysteresis models in laminated sheets. From the magnetic modelling point of view, an analytic approach for the initial simplified gear design is presented. A special focus is given to the computational burden of the method that is especially tailored for stochastic opt

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49

Memon, Sohail Ahmed. "Mathematical modelling of complex dynamics." Thesis, University of Central Lancashire, 2017. http://clok.uclan.ac.uk/20497/.

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Soft materials have a wide range of applications, which include the production of masks for nano–lithography, the separation of membranes with nano–pores, and the preparation of nano–size structures for electronic devices. Self–organization in soft matter is a primary mechanism for the formation of structure. Block copolymers are long chain molecules composed of several different polymer blocks covalently bonded into a single macromolecule, which belong to an important class of soft materials which can self–assemble into different nano–structures due to their natural ability to microphase sepa

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50

Strong, Shaun Regen. "Numerical modelling of pseudo-random seismic sources /." St. Lucia, Qld, 2003. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17550.pdf.

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