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Dissertations / Theses on the topic 'Wave flows'

Author: Grafiati
Published: 4 June 2021
Last updated: 16 February 2022

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1

Manca, Eleonora. "Effects of Posidonia oceanica seagrass on nearshore waves and wave-induced flows." Thesis, University of Southampton, 2010. https://eprints.soton.ac.uk/195257/.

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This work focuses on the effects of the large Mediterranean seagrass Posidonia oceanica on coastal waves and wave-induced flows, which has significant implications for coastal protection. Investigations were made on both a natural shallow Posidonia oceanica bed and, in controlled conditions of full-scale Posidonia mimics under regular and irregular waves. In the field, waves and currents were monitored during low energy conditions and a Mistral wind event. Data were collected on the distribution of Posidonia patches, density and canopy height, as well as bed sediment type and bathymetry. In th
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2

Aldridge, Christopher John. "Density-wave oscillations in two-phase flows." Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.260741.

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3

Moroney, Gerard. "Internal wave wakes in stratified shear flows." Thesis, University of Liverpool, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399177.

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4

Wikramanayake, Palitha Nalin. "Turbulent wave-current bottom boundary layer flows." Thesis, Massachusetts Institute of Technology, 1989. http://hdl.handle.net/1721.1/14353.

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5

Stephen, Adam Vercingetorix. "POD methods in baroclinic flows." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302401.

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6

Dominy, Robert Gerald. "Rarefied hypersonic shock wave and blunt body flows." Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/47034.

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7

Ingram, David M. "Numerical prediction of blast wave flows around rigid structures." Thesis, Manchester Metropolitan University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332898.

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8

Forster, Graham Keith. "Instability and wave-growth within some oscillatory fluid flows." Thesis, University of St Andrews, 1996. http://hdl.handle.net/10023/14087.

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Oscillatory fluid flows arise naturally in many systems. Whether or not these systems are stable is an important question and external periodic forcing of the flow may result in rich and complicated behaviours. Here three distinct oscillatory fluid flows are examined in detail, with the stability of each being established using a range of analytical and computational methods. The first system comprises standing surface capillary-gravity waves in second-harmonic resonance subject to Faraday excitation. Using the perturbation technique of multiple scales, the amplitude equations for the system a
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9

Mavromoustaki, Aliki. "Long-wave dynamics of single- and two-layer flows." Thesis, Imperial College London, 2011. http://hdl.handle.net/10044/1/6452.

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Thin-film flows are central to a number of industrial, biomedical and daily-life applications, which include coating flow technology, enhanced oil recovery, microfluidics, and surfactant replacement therapy. Though these systems have received a lot of attention in a variety of settings, the understanding of the dominant physics governing the flows is not completely thorough; this is especially true in cases where the free surface of the film or, in two-layer flows, the fluid-fluid interface is susceptible to instabilities leading to the break-up of the film and the formation of fingering patte
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10

Hartmann, Axel [Verfasser]. "Experimental Analysis of Wave Propagation at Buffet Flows / Axel Hartmann." Aachen : Shaker, 2012. http://d-nb.info/106904623X/34.

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11

Jiang, Feng. "The development of linear wave packets in unbounded shear flows." Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.385425.

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12

Maestri, Joseph. "Vortex-wave interactions and exact coherent structures in shear flows." Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/51109.

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Recent studies of transition to turbulence in linearly stable shear flows have been dominated by finding, and characterising, so-called exact coherent structures which exist as either equilibrium or travelling wave solutions of the governing Navier-Stokes equations. These structures have been shown to act as either edge states between laminar and turbulent flow or become associated with attractors for turbulent flows, making the quest to understand these structures equally as mathematically interesting as it is industrially relevant. In this thesis, vortex-wave interaction theory, an asymptoti
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13

Guarino, Maria Vittoria. "Mountain wave breaking in atmospheric flows with directional wind shear." Thesis, University of Reading, 2017. http://centaur.reading.ac.uk/75850/.

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In this thesis, mountain wave breaking triggered by directional wind shear is investigated using numerical simulations of idealized and semi-idealized orographic flows. Idealized simulations are used to produce a regime diagram to diagnose conditions for wave breaking in Richardson number-dimensionless mountain height parameter space. It is found that, in the presence of directional shear, wave breaking can occur over lower mountains than in a constant-wind case. Furthermore, the extent of regions within the simulation domain where Clear-Air Turbulence (CAT) is expected increases with terrain
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14

Wikramanayake, Palitha Nalin. "Velocity profiles and suspended sediment transport in wave-current flows." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/12542.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1993.<br>Includes bibliographical references (leaves 225-230).<br>by Palitha Nalin Wikramanayake.<br>Ph.D.
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15

Vieira, Rafael Fontes. "A numerical study on shock wave - boundary layer interaction flows." Instituto Tecnológico de Aeronáutica, 2013. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=2883.

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This thesis addresses the important problem of shock wave--boundary layer interaction (SBLI) flows for aerospace engineering applications. Moreover, the work emphasizes the need for high fidelity simulations for the appropriate treatment of such flows. In this context, RANS solvers appear as a cost effective CFD approach. Therefore, the present work conducts studies in such a way to identify and to understand limitations, strengths and capabilities of RANS simulations for SBLI flows. Since turbulence modeling is an important issue on the accuracy of such simulations, the efforts here are conce
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16

Ford, Rupert. "Gravity wave generation by vortical flows in a rotating frame." Thesis, University of Cambridge, 1993. https://www.repository.cam.ac.uk/handle/1810/251624.

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17

Pinilla, Camilo Ernesto. "Numerical simulation of shear instability in shallow shear flows." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=115697.

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The instabilities of shallow shear flows are analyzed to study exchanges processes across shear flows in inland and coastal waters, coastal and ocean currents, and winds across the thermal-and-moisture fronts. These shear flows observed in nature are driven by gravity and governed by the shallow water equations (SWE). A highly accurate, and robust, computational scheme has been developed to solve these SWE. Time integration of the SWE was carried out using the fourth-order Runge-Kutta scheme. A third-order upwind bias finite difference approximation known as QUICK (Quadratic Upstream Interpola
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18

Bura, Romie Oktovianus. "Laminar/transitional shock-wave/boundary-layer interactions (SWBLIs) in hypersonic flows." Thesis, University of Southampton, 2004. https://eprints.soton.ac.uk/47605/.

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Numerical investigations of laminar shock-wave/boundary-layer interactions (SWBLIs) in hypersonic flow have been carried out at M∞ = 6.85 and M∞ ≈ 8, with unit Reynolds numbers ranging from 2.0 x 106 m- l to 7.60 x 106 m- l. This thesis deals with a simplified 2-D geometric configuration to simulate SWBLIs on vehicle surfaces or engine intakes, i.e. the interaction of an oblique shock (produced by a wedge) impinging on an incoming laminar boundary-layer on an isothermal flat plate. The numerical simulations were performed with weak/moderate to strong shock. The results were compared with avail
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19

Murray, Neil Paul. "Three-dimensional turbulent shock-wave : boundary-layer interactions in hypersonic flows." Thesis, Imperial College London, 2007. http://hdl.handle.net/10044/1/7963.

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20

Weng, Chenyang. "Theoretical and numerical studies of sound propagation in low-Mach-number duct flows." Doctoral thesis, KTH, MWL Marcus Wallenberg Laboratoriet, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-168031.

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When sound waves propagate in a duct in the presence of turbulent flow, turbulent mixing can cause attenuation of the sound waves extra to that caused by the viscothermal effects. Experiments show that compared to the viscothermal effects, this turbulent absorption becomes the dominant contribution to the sound attenuation at sufficiently low frequencies. The mechanism of this turbulent absorption is attributed to the turbulent stress and the turbulent heat transfer acting on the coherent perturbations (including the sound waves) near the duct wall, i.e. sound-turbulence interaction. The purpo
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21

Thomas, Michael Dominic. "Nonlinear stability of flows over rigid and flexible boundaries." Thesis, University of St Andrews, 1990. http://hdl.handle.net/10023/14273.

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This work assesses the importance of nonlinearity in the stability of flows over compliant and rigid walls, and comprises three main parts. The first part considers inviscid flow with a free surface over a flexible boundary. The dispersion relation is obtained, and the conditions for linear instability investigated. The linear dispersion relation is then used to show that the conditions for nonlinear three-wave resonance are often met. In some circumstances, the resonance may be of 'explosive' sort, involving waves of opposite energy sign; but non-explosive resonant configurations are most com
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22

Campbell, Lucy J. "Nonlinear critical layer development of forced wave packets in geophysical shear flows." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ64529.pdf.

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23

Toomer, Christine Ann. "Weakley nonlinear baroclinic wave theory and its relevance to laboratory annulus flows." Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/46583.

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24

Foutter, Richard R. (Richard Robert). "A numerical investigation of weak shock wave effects in reacting nozzle flows." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/50293.

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25

Gambino, John Piero 1974. "A comparison of sediment transport models for combined current and wave flows." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/47420.

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26

Jian, Wei. "Smoothed particle hydrodynamics modelling of dam-break flows and wave structure interactions." Thesis, University of Cambridge, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.648472.

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27

Pelanti, Marica. "Wave propagation algorithms for multicomponent compressible flows with applications to volcanic jets /." Thesis, Connect to this title online; UW restricted, 2005. http://hdl.handle.net/1773/6784.

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28

Asproulias, Ioannis. "RANS modelling for compressible turbulent flows involving shock wave boundary layer interactions." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/rans-modelling-for-compressible-turbulent-flows-involving-shock-wave-boundary-layer-interactions(e2293c9d-de93-4e97-b8b8-967ec0b682d8).html.

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The main objective of the thesis is to provide a detailed assessment of the performance of four types of Low Reynolds Number (LRN) Eddy Viscosity Models (EVM), widely used for industrial purposes, on flows featuring SWBLI, using experimental and direct numerical simulation data. Within this framework the two-equation linear k-ε of Launder and Sharma (1974) (LS), the two-equation linear k-ω SST, the four-equation linear φ-f of Laurence et al. (2004) (PHIF) and the non-linear k-ε scheme of Craft et al. (1996b,1999) (CLSa,b) have been selected for testing. As initial test cases supersonic 2D comp
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29

Isoni, Andrea. "Vortex wave interaction theory to understand self sustaining processes in transitional flows." Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/24950.

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In this work the self-sustaining processes are investigated within a Couette flow de- veloping a method able to apply directly the stress jumps predicted by the vortex wave interaction theory. The challenge of the approach is to implement a technique able to directly implement the stress jumps and to implement a procedure able to deform the mesh to the flow variations. The derivation of the vortex wave interaction theory is also discussed and the numerical formulations of the governing equations are discretized through a spectral/hp element method. The method turns out to agree with the other
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30

Leszczyszyn, Antin M. "Resonant generation and refraction of dispersive shock waves in one-dimensional nonlinear Schrödinger flows." Thesis, Loughborough University, 2011. https://dspace.lboro.ac.uk/2134/9233.

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In the Thesis, two important theoretical problems arising in the theory of one-dimensional defocusing nonlinear Schrödinger (NLS) flows are investigated analytically and numerically: (i) the resonant generation of dispersive shock waves (DSWs) in one-dimensional NLS flow past a broad repulsive penetrable barrier; and (ii) the interaction of counter-propagating DSW and a simple rarefaction wave (RW), which is referred to as the DSW refraction problem. The first problem is motivated by the recent experimental observations of dark soliton radiation in a cigar-shaped BEC by sweeping through it a
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31

Wan, Bangjun. "A numerical study of conjugate flows and flat-centred internal solitary waves in a continuously stratified fluid." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/mq25896.pdf.

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32

Waywell, M. N. "Predictions of wave and tidally induced oscillatory flows with Reynolds stress turbulence models." Thesis, University of Salford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308264.

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33

Yang, Tian-Shiang. "Nonlinear interaction of long-wave distrubances with short-scale oscillations in stratified flows." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/37555.

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34

Buckland, Hannah. "Combined current, wave and turbulent flows and their effects on tidal energy devices." Thesis, Swansea University, 2014. https://cronfa.swan.ac.uk/Record/cronfa42509.

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This thesis considers the effect of disruptive waves and turbulence on a horizontal axis tidal stream turbine (TST), in terms of performance and survivability. The TST reaction to transient fluid flow is modelled analytically using Blade Element Momentum Theory (BEMT). Standard BEMT corrections are evaluated for the TST application and an alternative optimisation method is proposed for the steady state BEMT, improving compatibility with transient and depth dependent inflow, as well as the non-dimensionalisation constant needed to calculate the performance coefficients. Also, an alternative BEM
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35

Sansica, Andrea. "Stability and unsteadiness of transitional shock-wave/boundary-layer interactions in supersonic flows." Thesis, University of Southampton, 2015. https://eprints.soton.ac.uk/385891/.

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The aim of this research is to study the effect of transition location on the interaction between an oblique shock-wave and a boundary-layer. A large set of direct and large eddy simulations are performed with an in-house high-order fully-parallelised finite difference compressible Navier-Stokes solver to study the inherent instability and unsteady behaviour of laminar, transitional and turbulent interactions. The numerical simulations are compared with the experiments conducted at the Novosibirsk State University as part of the EU-FP7 TFAST project, providing a better understanding of the fun
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36

Patel, Rupa Ashyinkumar. "Theory and computation on nonlinear vortex/wave interactions in internal and external flows." Thesis, Imperial College London, 1997. http://hdl.handle.net/10044/1/8597.

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37

Buttgereit, Ruediger Volker. "The fluid dynamic study of ducted and unducted Wells turbines in undirectional and oscillatory flows." Thesis, Imperial College London, 1998. http://hdl.handle.net/10044/1/8885.

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38

Neuenhahn, Thomas [Verfasser]. "Investigation of the shock wave, boundary layer interaction of scramjet intake flows / Thomas Neuenhahn." Aachen : Shaker, 2010. http://d-nb.info/1007974192/34.

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39

Dorcheh, Saied Ahmad Mortazavi. "Effect of rigid vegetation on the velocity, turbulence, and wave structure in open channel flows." Thesis, Cardiff University, 2007. http://orca.cf.ac.uk/56179/.

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Vegetation plays an important role in changing the flow characteristics and flooding of natural channels. In this study a series of laboratory programmes were undertaken to investigate the effects of emergent and submerged vegetation on the flow structure in compound, simple and wide channels. The vegetation consisted of rigid rods replicating tree vegetation. In a laboratory flume, wooden rods were used to replicate this with three density states and one non-vegetated state being used to compare their effects on the flow characteristics in the flume. Velocities were measured using 3-D Acousti
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40

Febrer, Alles Gemma. "A hybrid approach for inclusion of acoustic wave effects in incompressible LES of reacting flows." Thesis, Loughborough University, 2012. https://dspace.lboro.ac.uk/2134/11979.

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LLean premixed combustion systems, attractive for low NOx performance, are inherently susceptible to thermo-acoustic instabilities - the interaction between unsteady heat release and excited acoustic wave effects. In the present work, a hybrid, coupled Large Eddy Simulation (LES) CFD approach is described, combining the computational efficiency of incompressible reacting LES with acoustic wave effects captured via an acoustic network model. A flamelet approach with an algebraic Flame Surface Density (FSD) combustion model was used. The ORACLES experiments - a perfectly premixed flame stabilise
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41

Khyyer, Abbas. "Improved Particle Methods by Refined Differential Operator Models for Free-Surface Fluid Flows." 京都大学 (Kyoto University), 2008. http://hdl.handle.net/2433/66215.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(工学)<br>甲第14147号<br>工博第2981号<br>新制||工||1442(附属図書館)<br>26453<br>UT51-2008-N464<br>京都大学大学院工学研究科都市環境工学専攻<br>(主査)教授 後藤 仁志, 教授 細田 尚, 准教授 牛島 省<br>学位規則第4条第1項該当
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42

Jones, Samuel Edward. "Symmetries in the kinematic dynamos and hydrodynamic instabilities of the ABC flows." Thesis, University of Exeter, 2013. http://hdl.handle.net/10871/14689.

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This thesis primarily concerns kinematic dynamo action by the 1:1:1 ABC flow, in the highly conducting limit of large magnetic Reynolds number Rm. The flow possesses 24 symmetries, with a symmetry group isomorphic to the group O24 of orientation-preserving transformations of a cube. These symmetries are exploited to break up the linear eigenvalue problem into five distinct symmetry classes, which we label I-V. The thesis discusses how to reduce the scale of the numerical problem to a subset of Fourier modes for a magnetic field in each class, which then may be solved independently to obtain di
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43

Silvestri, Lorenzo. "Numerical study of wind-wave interfacial phenomena." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/14643/.

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A DNS simulation has been performed in order to study the wind-wave interaction, especially focusing the attention on the interfacial phenomena. The numerical model is founded to reproduce gravity waves generation under the action of a turbulent wind. The VOF (volume of fraction) method is used in order to capture and model the free surface, while the wind is generated by imposing an external pressure gradient. This last choice, in contrast with the usual ways of simulating wind by a moving wall, turned out to be very effective from both the computational and the physical point of view. The
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44

Holmberg, Andreas. "Experimental Determination of Aeracoustic Sources in Low Mach Number Internal Flows." Licentiate thesis, KTH, MWL Strömningsakustik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-26133.

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In this thesis, the in-duct experimental methods for determining aeroacoustic N-ports of in-duct elements are discussed and improved. The scattering matrix determination methods and the related wave decomposition methods are evaluated from measurements in an empty duct carrying a mean flow. The improvements of a new over-determination method for the source part of the N-port is studied using simulations and measurements; in quiescent air as well as measurements of the flow associated noise of a mixer plate, here a triangular plate inserted at an angle in a duct. The new method is shown to impr
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45

Harlander, Uwe. "Some simple solutions of trapped Rossby waves in zonal barotropic multiple-jet flows." Universitätsbibliothek Leipzig, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-215362.

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This study concerns on trapped Rossby waves and local Rossby wave packets in zonal basic flows with two or more prominent extreme values (so called multiple-jet flows). For simplicity, most of the calculations are performed on the f-plane, but an extension to the ß-plane is also discussed. Under the assumption that the basic fiow is a solution to a special type of second order ordinary differential equation, we show that then the amplitudes of stationary trapped Rossby waves are solutions to an equation of the same type. We investigate the occurrence of trapped modal waves as well as the rays
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46

Sigfrids, Timmy. "Hot wire and PIV studies of transonic turbulent wall-bounded flows." Licentiate thesis, KTH, Mechanics, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-1577.

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<p>The compressible turbulent boundary layer developing over atwo-dimensional bump which leads to a supersonic pocket with aterminating shock wave has been studied. The measurements havebeen made with hot-wire anemometry and Particle ImageVelocimetry (PIV).</p><p>A method to calibrate hot-wire probes in compressible ow hasbeen developed which take into account not only the ow velocitybut also the inuence of the Mach number, stagnation temperatureand uid density. The calibration unit consists of a small jetow facility, where the temperature can be varied. The hot wiresare calibrated in the pote
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47

Ben, Hassan Saïdi Ismaïl. "Numerical simulations of the shock wave-boundary layer interactions." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS390/document.

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Les situations dans lesquelles une onde de choc interagit avec une couche limite sont nombreuses dans les industries aéronautiques et spatiales. Sous certaines conditions (nombre de Mach élevé, grand angle de choc…), ces interactions entrainent un décollement de la couche limite. Des études antérieures ont montré que la zone de recirculation et le choc réfléchi sont tous deux soumis à un mouvement d'oscillation longitudinale à basse fréquence connu sous le nom d’instabilité de l’interaction onde de choc / couche limite (IOCCL). Ce phénomène appelé soumet les structures à des chargement oscilla
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48

Harlander, Uwe. "Some simple solutions of trapped Rossby waves in zonal barotropic multiple-jet flows." Wissenschaftliche Mitteilungen des Leipziger Instituts für Meteorologie ; 17 = Meteorologische Arbeiten aus Leipzig ; 5 (2000), S. 44-60, 2000. https://ul.qucosa.de/id/qucosa%3A15148.

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This study concerns on trapped Rossby waves and local Rossby wave packets in zonal basic flows with two or more prominent extreme values (so called multiple-jet flows). For simplicity, most of the calculations are performed on the f-plane, but an extension to the ß-plane is also discussed. Under the assumption that the basic fiow is a solution to a special type of second order ordinary differential equation, we show that then the amplitudes of stationary trapped Rossby waves are solutions to an equation of the same type. We investigate the occurrence of trapped modal waves as well as the rays
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49

Brahmi, Nassim. "Etude numérique de la propagation et l’atténuation des ondes de choc en milieux confinés Turbulent structures of shock-wave diffraction over 90° convex corner Analysis of shock-wave diffraction over double concave cylindrical wedges. Part I: Shock dynamics Analysis of shock-wave diffraction over double cylindrical wedges. Part II: Vorticity generation Achieving an optimal shock-wave mitigation inside open channels with cavities for weak shock waves: a computational study." Thesis, Normandie, 2020. http://www.theses.fr/2020NORMIR09.

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La propagation des ondes de choc implique des interactions complexes entre ondes et milieux environnants, ce qui engendre plusieurs phénomènes tels que la réflexion, la diffraction, etc. Pour clarifier davantage la physique associée à ces phénomènes, des simulations numériques hautes résolutions ont été réalisées. En particulier l'analyse de la diffraction des ondes de choc sur deux surfaces concaves cylindriques a révélé que les angles de transition, d'une réflexion régulière à une réflexion de Mach, augmentent avec le nombre de Mach, alors qu'ils sont presque égaux sur les deux surfaces conc
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50

Aziz, Saduman. "Perfect Gas Navier-stokes Solutions Of Hypersonic Boundary Layer And Compression Corner Flows." Phd thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606661/index.pdf.

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The purpose of this thesis is to perform numerical solutions of hypersonic, high temperature, perfect gas flows over various geometries. Three dimensional, thin layer, compressible, Navier-Stokes equations are solved. An upwind finite difference approach with Lower Upper-Alternating Direction Implicit (LU-ADI) decomposition is used. Solutions of laminar, hypersonic, high temperature, perfect gas flows over flat plate and compression corners (qw=5&deg<br>, 10&deg<br>, 14&deg<br>, 15&deg<br>, 16&deg<br>, 18&deg<br>and 24&deg<br>) with eight different free-stream and wall conditions are presente
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