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 25 for “"Geophysical Flows"”.
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Modelling dispersion and mixing in geophysical flows
This thesis is concerned with modelling geophysical flows. The problems considered in this work include dispersion in flows through heterogeneous porous rocks, turbulent mixing in the surface layer of the ocean, and mixing in turbulent starting plumes. In chapters 2, 3 and 4, we study the …
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Complex Fluid Dynamics: From Laminar to Geophysical Flows
In this dissertation, we present analytical, experimental, and numerical work relating to two problems in fluid flow. We first treat the oldest, hardest, and arguably one of the most important problems in boundary layer theory: determining the drag on a sphere and an infinite cylinder moving at a …
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Multiscale Modeling and Simulation of Turbulent Geophysical Flows
… accurate and efficient numerical simulation of geophysical flows is of great interest in numerical weather prediction and climate modeling as well as in numerous critical areas and industries, such as agriculture, construction, tourism, transportation, weather-related disaster management, and …
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Weakly inhomogeneous turbulence theory with applications to geophysical flows
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Meteorology and Physical Oceanography, 1982.
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Flexible spectral algorithms for simulating astrophysical and geophysical flows
… code to the study of stellar and oceanic fluid flows. In the first part, the spectral algorithms used in Dedalus are introduced and the design and development of the code are described. In particular, the code's symbolic equation specification, arbitrary-dimensional parallelization, and sparse …
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Reduced-Order Modeling of Complex Engineering and Geophysical Flows: Analysis and Computations
… are frequently used in the simulation of complex flows to overcome the high computational cost of direct numerical simulations, especially for three-dimensional nonlinear problems. Proper orthogonal decomposition, as one of the most commonly used tools to generate reduced-order models, has been …
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Dynamics and parameterization of stably stratified turbulence: implications for estimates of mixing in geophysical flows
… analysis of basic physical quantities. In geophysical flows such as the ocean, overturns are relatively easy to observe while the basic quantities are not. As such, overturns provide a means of inferring basic quantities if the relationship between the observed and fundamental scales are …
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Prediction, analysis, and learning of advective transport in dynamic fluid flows
… crucial importance in classical fluid mechanics, geophysical flows, micro and nanofluidics, and biological flows. Even though mathematical models that thoroughly describe such transport exist, the inherent nonlinearities and the high dimensionality of complex fluid systems make it very challenging …
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Reduced modelling of mountains and ice sheets
… can often be treated as a fluid flow. These geophysical systems are, however, very complex in terms of the rheology of their constituents and their interactions with environment. Simple mathematical models are often very helpful to reduce the complexity of these systems to something that can …
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Advancing the theory and applications of Lagrangian Coherent Structures methods for oceanic surface flows
… these tools is yet to be proven, especially for geophysical flows.
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The Dynamics of Geophysical and Astrophysical Turbulence
Turbulence is ubiquitous within geophysical and astrophysical fluid flows. Its interaction with physical ingredients such as rotation and stratification gives rise to spectacular dynamics, including the layering of material properties, which in turn influence the transport and distribution of heat, …
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Small Scale Aeolian Processes and Landform Response
… and is also applicable to the broader family of geophysical flows. we addressed grainflow morphology on two relatively large dunes. The quantification and classification of grainflow morphology showed that grainflow shapes were dune-size dependent. The findings of this dissertation are relevant …
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Advancing the theory and applications of Lagrangian Coherent Structures methods for oceanic surface flows
… these tools is yet to be proven, especially for geophysical flows. An updated, parameter-free spectral clustering approach is developed and a noise-based cluster coherence metric is proposed to evaluate the resulting clusters. The method is tested against benchmarks flows of dynamical system …
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Two-Dimensional Transient Flows and Stability of Concentrated Suspensions of Clay Particles and Rheology
Motivated by geophysical flows of concentrated suspensions of clay particles, such as fluid mud, molten lava, and mining slurries, boundary-layer flows of these fluids on a slope are studied theoretically and experimentally. Rheological measurements using a state-of-the-art rheometer show that the …
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Experimental and Theoretical Developments in the Application of Lagrangian Coherent Structures to Geophysical Transport
The transport of material in geophysical fluid flows is a problem with important implications for fields as diverse as: agriculture, aviation, human health, disaster response, and weather forecasting. Due to the unsteady nature of geophysical flows, predicting how material will be transported in …
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Dynamics of deep-submarine explosive eruptions
… mechanisms of these complex multi-phase flows. In chapter 3 we explore the dynamics of particle-laden fountains in a stratified environment, and identify two distinct flow regimes as a function of the average size of the particles, in which the flow is controlled by the ambient …
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The dynamics of bottom boundary currents in the ocean
… various dynamical features of these complex geophysical flows may be isolated and explored. Two separate models are formulated and the theoretical results are compared to observational data and/or laboratory experiments. A steady flow over a constant sloping bottom is treated in each model. A …
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Mixing in stably stratified turbulent flows: improved parameterizations of diapycnal mixing in oceanic flows
… phenomenon in both natural and engineered flows. Fundamental understanding and quantitative prediction of turbulent mixing in stratified flows is a challenging problem, with a broad range of applications including (but not limited to) prediction of climate, ocean thermohaline circulation, …
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