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 “"Non-Hydrostatic"”.
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Non-Hydrostatic Models For Wave Propagation, Breaking, And Run-Up
This dissertation develops a series of non-hydrostatic pressure wave models based on the finite element free surface flow model, CCHE2D, for simulating propagation, breaking, and run-up of coastal wave processes. The first non-hydrostatic formulation presented in this dissertation directly …
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High order hybrid discontinuous Galerkin regional ocean modelling
… space scales. However, in light of the strong nonlinearities observed in coastal regions and in biological processes, such modeling is challenging. An important subject that has been largely overlooked is the numerical requirements for regional ocean simulation studies. Major objectives of this …
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Internal tides near steep topographies
… stages of development of a 2D, finite-volume, non-hydrostatic, [sigma]-coordinate code and beginning to apply the Dynamically Orthogonal field equations to study the sensitivity of internal tides to perturbations in the density field. First, we ensure that the 2D Finite Volume (2DFV) code that …
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Flow-Transport Modeling and Quantification
… The research work showed the inability of hydrostatic numerical modeling systems to accurately predict flow separation at the bed form crest but indicated that these models could reasonably predict the out of phase relationship between the bed form and the water surface profile. Furthermore …
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Amorphisation Mechanisms of Metal-Organic Frameworks under High Pressures and Temperatures
… The methods chosen for investigation were hydrostatic compression, non-hydrostatic compression, and ball-milling, as they are all used for industrial processing of powders: The former two are methods for shaping, and the latter for mixing. Hydrostatic compression of these MOFs is …
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Aumento della risoluzione spaziale per il sondaggio di temperatura e umidità da satellite geostazionario mediante radiometria ad onde millimetriche e submillimetriche
… simulated by the University of Wisconsin - Non-hydrostatic Model System (UW-NMS). Three approaches, Wiener filter, Super-Resolution and Image Fusion have been applied to some representative GOMAS frequency channels to enhance the resolution of antenna temperatures. The Wiener filter improved …
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The Effect of Composition on the High-Pressure Behavior of Rare-Earth Phosphate Minerals
… showed no phase transitions up to 10 GPa under hydrostatic conditions. The spectra were used to develop Kieffer-type lattice vibrational models to calculate heat capacities of CePO4 and YPO4 and the results lie within 1-3% of experimental values. Equations of state were calculated from …
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Diversity of compressional mechanisms among SiO2 polymorphs : case of coesite and cristobalite
… unresolved. Samples recovered from the quasi-hydrostatic experiments carried out up to ~51 GPa, show the structure of the initial coesite, but those compressed between the diamond anvils (uniaxial stress) appear amorphous. The very short Si-O bond found in coesite-I and its high …
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Diversity of compressional mechanisms among SiO<sub>2</sub> polymorphs : case of coesite and cristobalite.
… unresolved. Samples recovered from the quasi-hydrostatic experiments carried out up to ~51 GPa, show the structure of the initial coesite, but those compressed between the diamond anvils (uniaxial stress) appear amorphous. The very short Si-O bond found in coesite-I and its high …
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Mimetic Coastal Ocean Modeling In General Coordinates And Using Machine Learning Based Predictions
<p>Nonlinear internal waves are a ubiquitous and fundamental aspect of the coastal ecosystem understanding. However, they rely on extreme geographical conditions and precise dimensional equilibrium to be captured accurately. The General Curvilinear Coastal Ocean Model (GCCOM) was validated, serial …
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Mesometeorological modelling and trajectory studies during an air pollution episode in the lower Fraser Valley, British Columbia, Canada
… System from Colorado State University, a non hydrostatic, three-dimensional mesoscale modelling system to simulate the detailed structure of air flows over the valley for one specific episode day. Significant code modifications have been made to enhance the model's ability to represent …
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The phase transition of the rubidium halides
… the transition pressure, the effects of non-hydrostatic stress, energy differences, and the volume changes at the transition in the Rubidium Halides. Although we agree with an earlier statement by Tosi and Fumi that it is essential to use crystal data over a wide range of pressures in …
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Towards Coupled Nonhydrostatic-Hydrostatic Hybridizable Discontinuous Galerkin Method
… Many regional ocean models resort to a hydrostatic (HS) approximation that significantly reduces the computational burden. However, a challenge is to capture and study local ocean phenomena involving complex dynamics over a broader range of scales, from regional to small scales, and …
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High Pressure Studies of Superconductivity
… anisotropic behavior under pressure. Precise hydrostatic measurements of <strong>dT</strong><strong>c</strong><strong>/dP </strong>on HgBa<strong>2</strong>CuO<strong>4+_ </strong>have been carried out in conjunction with uniaxial pressure experiments by another group. The results obtained …
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Numerical simulation of a mesoscale convective system over the east coast of South Africa
… This particular MCS is investigated with a non-hydrostatic numerical model (MM5) to help determine which processes were important in its initiation and development, as well as what factors contributed to the associated heavy rainfall. The model is also used to conduct sensitivity tests to …
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The Influence of Obliquely Propagating Monsoon Gravity Waves on the Polar Summer Mesosphere
… and seasonal variations of this phenomenon, can improve the gravity-wave parameterization schemes used in the global models. My dissertation relies upon the atmosphere theory and the gravity-wave observations, first, to perform an observational analysis of the oblique propagation of …
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Assimilation of Meteosat Second Generation (MSG) satellite data in a regional numerical weather prediction model using a one-dimensional variational approach
… numerical weather prediction (NWP) models. The non-hydrostatic forecast model COSMO (COnsortium for Small scale MOdelling) in the ARPA-SIM operational configuration is used to provide background fields. Only clear sky observations over sea are processed. An optimised 1D–VAR set-up comprising of …
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On the generation of waves during frontogenesis
… strong strains. Thirdly, the model incorporates non-hydrostatic effects and unbounded domains. An important novel feature of the model is the accurate description of inertia-gravity wave generation during frontogenesis. We show that these waves can be generated both by the geostrophic adjustment …
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Simulating the Characteristics of Tropical Cyclones over the South-West Indian Ocean: Sensitivity to Model Horizontal Resolution
… Model for Prediction Across Scales (MPAS-A), a non-hydrostatic variable-resolution model which is employed at multiple resolutions ranging from 60km–3km. In both analyses, systems were identified using a novel resolution dependent tracking algorithm that includes wind speed, vorticity, and warm …
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A numerical and observational study of the genesis of concentric eyewall hurricanes
… model and a two-dimensional cloud resolving non-hydrostatic model. The latter is called the full physics model for short. Owing to the lack of direct measurements of upper-level atmospheric conditions, we choose to use reanalysis data from National Centers for Environmental Prediction (NCEP) …
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