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 19 of 19 for “"Wave-Wave interactions"”.
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On wave-wave interactions on the ocean surface
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1992.
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Chemical and Thermochemical Wave Behavior in Multiphase Fluid Flow Through Permeable Media: Wave-Wave Interactions
… reactive flow. These regions are separated by waves, which mark the change in composition from one region to the next. We develop a theory which elucidates the interactions of these chemical waves with those formed from other flowing phenomena. We consider the following interactions: 1.) the …
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Nonlinear acoustics in the presence of an object with sum or difference frequency sensing
… fields and naturally breaks into (A) nonlinear waves generated by wave-wave interactions, and (B) second-order scattered waves that include the effect of centriodal motion of the object driven by a complete second-order wave-exciting force. Analytic expressions for second-order fields due to …
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The role of wavenumber one and two in the development of sudden stratospheric warmings
… thesis, we investigate the effects of planetary waves one and two on the polar stratosphere during boreal winter. We use MERRA reanalysis data and the FMS shallow-water model to compare and contrast their propagation into the stratosphere, their interactions within the stratosphere, and their …
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Quantification of linear and nonlinear energy transfer processes in a plane wake
… described as a sequence of instabilities and wave-wave interactions. In the initial small-amplitude stage,. a narrow, but continuous, band of dominant instability modes centered near the most unstable mode, known also as the fundamental mode, grow exponentially at rates that can be calculated …
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A study of ocean wave statistical properties using nonlinear, directional, phase-resolved ocean wave-field simulations
In the present work, we study the statistics of wavefields obtained from non-linear phase-resolved simulations. The numerical model used to generate the waves models wave-wave interactions based on the fully non-linear Zakharov equations. We vary the simulated wavefield's input spectral properties: …
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A study of ocean wave statistical properties using nonlinear, directional, phase-resolved ocean wave-field simulations
In the present work, we study the statistics of wavefields obtained from non-linear phase-resolved simulations. The numerical model used to generate the waves models wave-wave interactions based on the fully non-linear Zakharov equations. We vary the simulated wavefield's input spectral properties: …
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Features of nonlinear wave-wave and wave-body interactions
Although nonlinear water waves have been the subject of decades of research, there are many problems that remain unsolved, especially in the cases when one or more of the following factors are involved: high-order nonlinear effects, moving boundaries, wavestructure interactions and complicated …
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Triad Interactions among Surface Waves Propagating through an Ice Sheet
We study nonlinear resonant wave-wave interactions which occur when ocean waves propagate into a thin floating ice sheet. Using multiple-scale perturbation analysis verified against regular perturbation for short distances past the ice edge, we obtain theoretical predictions of the wave amplitude …
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Time-dependent assimilation of CTD data to an open ocean Rossby wave model
… is represented by freely propagating Rossby waves in the 1st and 2nd baroclinic modes whose time-dependent amplitudes are fit to the data at the two survey times. First the linear dispersion relation is used to evolve the waves in time, then the weak nonlinear interactions between the waves …
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Analytical and Numerical Studies of the Generation and Propagation of Nonlinear Water Waves by a Wavemaker
… to predict the nonlinear effects of extreme wave events is paramount for the preparation of modern experimental tests in large wave basins. Currently, linear theory is routinely used, hence nonlinear wave-wave interactions between propagating waves are often ignored. In addition, the …
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Field measurements of a swell band, shore normal, flux divergence reversal
… need increase shoreward due to nonlinear wave-wave interactions and maturation of the spectrum. Lastly, we will verify that the data presented is consistent with other measures collected during the same deployment in the Atchafalaya Bay during March - April 2010.
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Field measurements of a swell band, shore normal, flux divergence reversal
… need increase shoreward due to nonlinear wave-wave interactions and maturation of the spectrum. Lastly, we will verify that the data presented is consistent with other measures collected during the same deployment in the Atchafalaya Bay during March - April 2010.
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Nonlinear effects on interfacial wave growth into slug flow
… instability mechanisms can create initial wave disturbances on the interface: the classic Kelvin-Helmholtz instability or shear induced instability. These instability mechanisms, which affect the initial growth of the disturbances on the interface, are well understood; however, the …
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Role of Planetary Wave-Tide-Gravity Wave Interactions In Whole Atmosphere Coupling
… sites and compared to a co-located sodium lidar. Wave-wave interactions in the mesosphere and lower thermosphere (MLT) that may be responsible for the penetration of six-day periodicities into the Earth's ionosphere during the 2019 Southern Hemispheric (SH) SSW are first investigated. This study …
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Theoretical and Numerical Studies of Frequency Up-shifted Ionospheric Stimulated Radiation
… electromagnetic emission (SEE) produced by interactions of high-power radio waves with the Earth's ionosphere is currently a topic of significant interest in ionospheric modification physics. SEE is believed to be produced by nonlinear wave-wave interactions involving the electromagnetic and …
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Non-linear saturation of vertically propagating Rossby waves
… amplitude increase with height for Rossby waves propagating vertically through a stratified atmosphere, as a result of wave activity density conservation. At the same time layer-wise conservation of potential enstrophy constrains wave amplitudes, given the limited amount of potential …
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Observations of turbulence, internal waves and background flows : an inquiry into the relationships between scales of motion
… of turbulent mixing in the ocean due to internal waves. Turbulent mixing is quantified through eddy diffusivity parameterizations of the mass (Kρ; Osborn, 1980) and heat fluxes (Kτ; Osborn and Cox, 1972) in turbulent production/dissipation balances. Turbulence in the ocean is generally held to …
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Interference and resonance of internal gravity waves
Internal waves are propagating disturbances within stratified fluids, arising from a balance of gravity, buoyancy, and rotation. As well as being of fundamental scientific interest, they are ubiquitous in a variety of forms in the Earth's oceans, where they are responsible for driving vertical …