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 28 for “"Eddy Resolving"”.
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Towards Predictive Eddy Resolving Simulations for Gas Turbine Compressors
… aims to explore the potential for using large eddy simulation (LES) as a predictive tool for gas-turbine compressor flows. Compressors present a significant challenge for the Reynolds Averaged Navier-Stokes (RANS) based CFD methods commonly used in industry. RANS models require extensive …
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Eddy-resolving simulations of the flow around a vertical tail plane
… performed and the results are compared to Large-Eddy Simulations (LES). The analysis shows that, even though RANS may predict the onset of flow separation correctly, they completely miss the location of flow reattachment over the ramp, and this affects the whole flow solution. Moreover, the flow …
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Subduction in an eddy-resolving state estimate of the northeast Atlantic Ocean
… Ocean is created by combining a regional, eddy-resolving numerical model with observations to produce a state estimate of the ocean circulation. The estimate is a synthesis of a variety of in-situ observations from the Subduction Experiment, TOPEX/POSEIDON altimetry, and the MIT General …
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Evaluation of an eddy resolving HYCOM simulation in the South Atlantic Ocean
… In a detailed analysis, this study evaluates an eddy resolving 1/12° HYbrid Coordinate Ocean Model simulation in the South Atlantic and Agulhas regions with reference to available observations and literature. The outcomes of this research contribute to improving the configurations of future ocean …
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Subduction in an eddy-resolving state estimate of the northeast Atlantic Ocean
… Ocean is created by combining a regional, eddy-resolving numerical model with observations to produce a state estimate of the ocean circulation. The estimate is a synthesis of a variety of in-situ observations from the Subduction Experiment, TOPEX/POSEIDON altimetry, and the MIT General …
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Measurements of a barotropic planetary vorticity mode in an eddy-resolving quasi-geostrophic model using acoustic tomography
A tomographic array is placed in a 2-layer, flat bottom, steady-wind driven quasi-geostrophic circulation model to investigate whether the analysis of acoustic travel time changes can detect large-scale barotropic oscillations. Time series of sea surface elevation and upper and lower layer …
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The use of adjoint models for determining the sensitivity of integral quantities in an eddy resolving Oean General Circulation Model
… in the forcing or initial conditions. In eddy resolving ocean models the presence of chaotic eddies is expected to lead to sensitivities to infinitesimal perturbations that are very different from the sensitivity to large perturbations and that no longer contain useful information. …
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Application of an inverse model in the community modeling effort results
… are. The inverse model is first tested in a non-eddy resolving numerical GCM ocean. Numerical/scale analyses are used to test whether the inverse model properly represents the GCM ocean. Experiments show how biased answers could result from an incorrect model, and how a correct model must produce …
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Computational analysis of the biophysical controls on Southern Ocean phytoplankton ecosystem dynamics
… Chapters 3 and 4, I employ a higher resolution, eddy resolving, integration to explicitly track and examine closed eddy structures and address how they modify biomass at the mesoscale.
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Mesoscale variability and mean flow interaction near the Gulf Stream as seen by satellite altimetry and numerical modelling
The interaction between the eddy field and the mean flow near the Gulf Stream is studied here using satellite altimeter measurements and an eddy resolving numerical modeL. The eddy vorticity flux in the quasigeostrophic framework is obtained from the stream function standard deviation and spatial …
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Mesoscale variability and mean flow interaction near the Gulf Stream as seen by satellite altimetry and numerical modelling
The interaction between the eddy field and the mean flow near the Gulf Stream is studied here using satellite altimeter measurements and an eddy resolving numerical model. The eddy vorticity flux in the quasigeostrophic framework is obtained from the stream function standard deviation and spatial …
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Mixing by ocean eddies
… First, mixing rates are diagnosed from an eddy-resolving state estimate of the Southern Ocean, revealing a meridional cross-section of effective diffusivity shaped by the interplay between eddy propagation and mean flow. Effective diffusivity diagnostics are then applied to quantify surface …
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Representation of eddies in climate models by a potential vorticity flux
… the heat and momentum transporting properties of eddy motions for use in three-dimensional, primitive equation, z-coordinate atmosphere and ocean models. Determining the transport characteristics of these eddies is fundamental to understanding their effect on the large-scale ocean circulation and …
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Representation of eddies in climate models by a potential vorticity flux
… the heat and momentum transporting properties of eddy motions for use in three-dimensional, primitive equation, z-coordinate atmosphere and ocean models. Determining the transport characteristics of these eddies is fundamental to understanding their effect on the large-scale ocean circulation and …
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Mesoscale circulation in the Black Sea : a study combining numerical modelling and observations
… Within this research: i) A folly working eddy resolving Black Sea model was set up using the POLCOMS 3-D numerical code, ii) The mesoscale circulation in the Black Sea during October-November 2004 was characterised from in situ CTD measurements and from satellite-derived sea surface …
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Equilibration of an atmosphere by geostrophic turbulence
… studies is to quantify the role of turbulent eddy fluxes in maintaining the observed atmospheric mean state. It has been argued that eddy fluxes keep the mid-latitude atmosphere in a state that is marginally critical to the deepest mode of baroclinic instability, which provides a powerful …
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Ring Dynamics in the Western Gulf of Mexico
… is studied using observations and a two-layered eddy-resolving general circulation model of the Gulf of Mexico. This interaction is investigated by following the evolution of volume, energy, potential vorticity, angular momentum and enstrophy within a model ring as it moves westward and …
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The influence of topography on ice-ocean interactions in coastal Antarctica
… shelf. In Chapter 2, we use an idealized, eddy-resolving model to examine how an outflow of Dense Shelf Water (DSW) drives an inflow of warmer Circumpolar Deep Water (CDW) in a narrow, prograde trough. We find that the trough organizes mesoscale, cyclonic eddies in the dense outflow into a …
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Computational analysis of the biophysical controls on Southern Ocean phytoplankton ecosystem dynamics
… Chapters 3 and 4, I employ a higher resolution, eddy resolving, integration to explicitly track and examine closed eddy structures and address how they modify biomass at the mesoscale. Chapter 3 considers how simulated eddies drive bottom-up controls on phytoplankton growth and finds that …
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