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 11 of 11 for “"Rogue waves"”.
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Study of directional ocean wavefield evolution and rogue wave occurrence using large-scale phase-resolved nonlinear simulations
… to study the evolution of directional ocean waves and occurrence of rogue waves (extremely large waves). Using SNOW, we obtain an ensemble of nonlinear deep-water wavefield simulations, initialized by JONSWAP spectrum with a broad range of spectral parameters, over large space-time scales. …
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A hybrid model for large scale simulation of unsteady nonlinear waves
A hybrid model for simulating rogue waves in random seas on a large time and space scale is proposed in this thesis. It is formed by combining the derived fifth order Enhanced Nonlinear Schrödinger Equation based on Fourier transform (ENLSE-5F), the fully nonlinear Enhanced Spectral Boundary …
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Orbital angular momentum and fully structured light in nonlinear media and cavities
… mechanism for producing two dimensional optical rogue waves in a turbulent state driven by vortices with helical wavefronts. Self-organising hexagonal structures bound in phase lose stability and synchronised oscillations are unstable leading to phaseunbound vortex-mediated turbulence with high …
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Optically injected multi-mode semiconductor lasers
… phenomena in other fields of study, namely ’Rogue waves’ that have been previously witnessed in oceanography and are suspected as having non-linear origins. The first half of this thesis includes a reliable and fast technique to categorise the dynamical state of optically injected two mode …
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The role of smoothing effect in some dispersive equations
… Dysthe equation, which is used to model oceanic rogue waves.
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Numerical and asymptotic modeling of evolving nonlinear ocean surface wave fields
… model for the evolution of nonlinear ocean waves, including extreme waves known as Rogue/Freak waves. Due to their elusive and destructive nature, the media often portrays Rogue waves as unimaginatively huge and unpredictable monsters of the sea. To address these concerns, derivations of …
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Estimates for solutions to the Dysthe equation and numerical simulations of walking droplets in harmonic potentials
… has been used to model extraordinarily large waves occurring on the ocean's surface called rogue waves. In this thesis, we prove dispersive estimates and Strichartz estimates for the Dysthe equation. We then prove a Kato-type smoothing effect in which we are able to bound uniformly in space …
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Pattern Formation in Certain Classical and Quantum Systems
… projects that my research includes research into rogue waves and a mapping between classical and quantum systems. The rogue wave work deals with analysis of the Nonlinear Schr"{o}dinger Equation and developing new forms of rogue wave solutions. This process includes focussing on the time-reversal …
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Towards Rogue Wave Characterization in False Bay, South Africa
Rogue waves are extreme oceanic waves which exceed twice the significant wave height of the wave record. In False Bay, South Africa, a shallow sea mount called rocky bank was suggested by Shipley (1964) to be the cause for increased wave energy along the eastern periphery of False Bay, where it is …
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Analytical and computational methods for non-Gaussian reliability analysis of nonlinear systems operating in stochastic environments
… by the inherently stochastic nature of random waves. Due to the dynamical nonlinearity of these systems, the statistical response is typically non-Gaussian with highly non-trivial distribution tails, making the problem of risk analysis a very hard one. However, accurate estimates of responses …
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Direct and adaptive quantification schemes for extreme event statistics in complex dynamical systems
… climate events, turbulence, formation of freak waves in the ocean and optics, and dynamical systems in engineering applications, including mechanical components under environmental loads, ship rolling and capsizing, critical events in power grids, as well as chemical reactions and conformational …