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 1072 for “"eddy"”.
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Influence of eddy-eddy interactions and tropical wind variability on sudden stratospheric warming formation
This thesis investigates the effects of eddy-eddy interactions (EEI) and tropical wind variability on sudden stratospheric warming (SSW) formation in an idealized atmospheric GCM. Chapter 2 introduces a method to produce split and displacement SSWs in comparable amounts using either wavenumber 1 or …
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Eddy dynamics of ß plumes
The importance of eddies and nonlinearities in ß-plume dynamics in the deep ocean was investigated using reduced gravity models of the deep ocean forced by a small region of cross isopycnal transport in the interior. The effect of topography on ß-plumes was also examined by placing a Gaussian bump …
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Toward Ideal Large -Eddy Simulation
In the second case, a coarse finite-volume representation defines the LES scales. Optimal flux models are expressed as modifications of standard fourth-order schemes, so that numerical and subgrid effects are treated simultaneously. The LES obeys only a bulk conservation of mass, but it is shown …
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Toward Ideal Large-Eddy Simulation
… that there is a subgrid model for large-eddy simulation (LES) of turbulence that is provably ideal in at least two important senses: a simulation using the ideal model matches all spatial statistics and minimizes error in the large-scale dynamics. However, the ideal model embodies a …
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Eddy dynamics of [Beta] plumes
Thesis (S.M.)--Joint Program in Oceanography/Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2003.
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Modeling of Eddy Current Separation
Eddy current separation aims to recover non-ferrous metals from non-metals utilizing electromagnetic interactions. In order to describe the separation process, a representative model is needed that can accurately calculate the induced forces. Such a model can be used to optimize the efficiency of …
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Large-Eddy Simulations of Hydrocyclones
… process in hydrocyclones using large-eddy simulations of turbulent multiphase flow. Two types of hydrocyclones are considered. The first is a classifying hydrocyclone, and the second is a mineral flotation hydrocyclone, also known as an air-sparged hydrocyclone (ASH). Large-eddy …
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Predicting eddy detachment from thin jets
Using a semi-geostrophic, reduced gravity thin jet model, we analytically study the evolution of initial meanders into pinched-off rings. The model used is similar to the path equation developed by Flierl and Robinson {1984) for vertically coherent meanders. However, in the present model, the …
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Large Eddy Simulation Reduced Order Models
… uses spatial filtering to develop a large eddy simulation reduced order model (LES-ROM) framework for fluid flows. Proper orthogonal decomposition is utilized to extract the dominant spatial structures of the system. Within the general LES-ROM framework, two approaches are proposed to …
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Finite-Volume Optimal Large -Eddy Simulation
Finally, the dynamic optimal finite-volume LES model is applied to more a more complex flow, the temporally-growing shear layer. The results obtained with dynamic optimal finite-volume LES models are comparable with the DNS results of Rogers & Moser (1994), at a fraction of the cost. One expects …
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Predicting eddy detachment from thin jets
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences and Woods Hole Oceanographic Institute, 1991.
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When an eddy encounters shelf-slope topography
… stratified numerical experiments to explore eddy-slope interactions under four questions: 1. Can the continental slope prevent an eddy from reaching the shelfbreak? 2. What is the structure of the eddy-driven offshore low? 3. How is the continental shelf affected by an eddy at the shelfbreak? …
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Scramjet combustion modeling using eddy dissipation model
… Mach number operation, this works considers the Eddy Dissipation Model (EDM) to describe the combustion process inside an open-access Computational Fluid Dynamics (CFD) solver. Typical CFD modeling approaches for turbulent supersonic reacting flows are associated with a high computational cost. …
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Large Eddy Simulation of Boundary Layer Combustion
… of heat and mass transfer on the turbulent eddy structure and statistics. Lastly, an application of a simplified non-premixed wall flame configuration is presented in which the fuel corresponds to pyrolysis products supplied by a thermally-degrading flat sample of polymethyl methacrylate …
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Large Eddy Simulations of complex turbulent flows
… is developed using a combination of Large Eddy Simulation (LES) and Immersed Boundary Method (IBM) concepts. LES is an intermediate approach to turbulence simulation in which the onus of modeling of “universal” small scales is appropriately transferred to the resolution of …
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Eddy current displacement sensor with LTCC technology
… and information were collected and compared. An eddy current displacement sensor using the novel LTCC technology was found to match the related measurement conditions such as harsh and high temperature environments, non-magnetic metal blades, etc. Then, according to the structure of the LTCC …
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LARGE EDDY SIMULATION OF TURBULENT HYDROGEN FLAMES
… turbulent hydrogen combustion using large eddy simulation (LES) combined with advanced combustion modeling approaches. In particular, flamelet-based models and transported probability density function (PDF) methods based on the Eulerian stochastic fields (ESF) framework are employed to …
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