Dissertations / Theses on the topic 'Geophysical and environmental fluid flows'
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Woods, Andrew W. "Geophysical fluid flows." Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.306472.
Full textPaleo, Cageao Paloma. "Fluid-particle interaction in geophysical flows : debris flow." Thesis, University of Nottingham, 2014. http://eprints.nottingham.ac.uk/27808/.
Full textHiggins, Erik Tracy. "Multi-Scale Localized Perturbation Method for Geophysical Fluid Flows." Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/99889.
Full textMaster of Science
Natural flows, such as those in our oceans and atmosphere, are seen everywhere and affect human life and structures to an amazing degree. Study of these complex flows requires special care be taken to ensure that mathematical equations correctly approximate them and that computers are programmed to correctly solve these equations. This is no different for researchers and engineers interested in studying how man-made flows, such as one generated by the wake of a plane, wind turbine, cruise ship, or sewage outflow pipe, interact with natural flows found around the world. These interactions may yield complex phenomena that may not otherwise be observed in the natural flows alone. The natural and artificial flows may also mix together, rendering it difficult to study just one of them. The multi-scale localized perturbation method is devised to aid in the simulation and study of the interactions between these natural and man-made flows. Well-known equations of fluid dynamics are modified so that the natural and man-made flows are separated and tracked independently, which gives researchers a clear view of the current state of a region of air or water all while retaining most, if not all, of the complex physics which may be of interest. Once the multi-scale localized perturbation method is derived, its mathematical equations are then translated into code for OpenFOAM, an open-source software toolkit designed to simulate fluid flows. This code is then tested by running simulations to provide a sanity check and verify that the new form of the equations of fluid dynamics have been programmed correctly, then another, more complicated simulation is run to showcase the benefits of the multi-scale localized perturbation method. This simulation shows some of the complex fluid phenomena that may be seen in nature, yet through the multi-scale localized perturbation method, it is easy to view where the man-made flows end and where the natural flows begin. The complex interactions between the natural flow and the artificial flow are retained in spite of separating the flow into two parts, and setting up the simulation is simplified by this separation. Potential uses of the multi-scale localized perturbation method include multi-scale simulations, where researchers simulate natural flow over a large area of land or ocean, then use this simulation data for a second, small-scale simulation which covers an area within the large-scale simulation. An example of this would be simulating wind currents across a continent to find a potential location for a wind turbine farm, then zooming in on that location and finding the optimal spacing for wind turbines at this location while using the large-scale simulation data to provide realistic wind conditions at many different heights above the ground. Overall, the multi-scale localized perturbation method has the potential to be a powerful tool for researchers whose interest is flows in the ocean and atmosphere, and how these natural flows interact with flows created by artificial means.
San, Omer. "Multiscale Modeling and Simulation of Turbulent Geophysical Flows." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/28031.
Full textPh. D.
Amooie, Mohammad Amin. "Fluid Mixing in Multiphase and Hydrodynamically Unstable Porous-Media Flows." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1532012791497784.
Full textZidikheri, Meelis Juma, and m. zidikheri@bom gov au. "Dynamical Subgrid-scale Parameterizations for Quasigeostrophic Flows using Direct Numerical Simulations." The Australian National University. Research School of Physical Sciences and Engineering, 2008. http://thesis.anu.edu.au./public/adt-ANU20090108.112027.
Full textNielsen, Adam C. "Computational fluid dynamics applications for the Lake Washington Ship Canal." Thesis, University of Iowa, 2011. https://ir.uiowa.edu/etd/1043.
Full textChipongo, Kudzai. "Effects of lateral inflow on oxygen transfer and hydraulics in open channel flows." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2018. https://ro.ecu.edu.au/theses/2053.
Full textGhanbarian-Alavijeh, Behzad. "Modeling Physical and Hydraulic Properties of Disordered Porous Media: Applications from Percolation Theory and Fractal Geometry." Wright State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=wright1401380554.
Full textGrisouard, Nicolas. "Réflexions et réfractions non-linéaires d'ondes de gravité internes." Grenoble, 2010. http://www.theses.fr/2010GRENU023.
Full textInternal wave studies are crucial to the understanding of deep-ocean mixing. In this thesis, we first describe a 2D direct numerical simulation of a wave attractor and validate it against pre-existing experimental data. We then propose a model for the thickness of the attractor along the direction of propagation of energy. We eventually study nonlinear effects induced by the attractor. In a second part, we describe an experimental study of the reflection of plane waves on a sloping wall. Unexpectedly, resonances between different wave harmonics are not observed. However, a horizontal mean flow is generated and the wave characteristics are curved, due to the Doppler effect. 70 to 80% of the incident energy flux is dissipated and transferred to the mean flow, the latter being seemingly generated by wave dissipation. In a third part, we perform a numerical study of the generation of internal solitary waves by an impinging wave beam. We first present direct numerical simulations of this process and show that different solitary wave modes can be excited. Criteria for the selection of a particular mode are put forward, the first one being in terms of phase speeds and the second one based on geometrical arguments. Results are compared with the configuration of the Bay of Biscay in summer. We show that a beam impinging on a thermocline initially at rest cannot generate solitary waves which features agree with oceanic observations. This can be corrected by considering the background flow around the thermocline as found in the Bay of Biscay and independent of the internal wave beam
"Some studies on geophysical flows." Thesis, 2006. http://library.cuhk.edu.hk/record=b6074264.
Full textThe aim of the thesis is to understand the dynamics and interactions between the Ekman layer and thermal layer which are very important issues in the studies of geophysical flows. We obtain some new results on the primitive equations of the atmosphere and the incompressible Navier-Stokes equations with rotating terms. We study the asymptotic limits of the solutions to the initial boundary value problem for the three dimensional primitive equations. We have constructed the asymptotic ansatz which is uniformly valid up to the boundary to derive the quasi-geostrophic equations and the corresponding boundary layer systems. These equations are also important and widely studied in the geophysical flows. The uniform convergence to the solutions for quasi-geostrophic equations is obtained rigorously.
Niu Dongjuan.
"June 2006."
Adviser: Zhouping Xin.
Source: Dissertation Abstracts International, Volume: 68-03, Section: B, page: 1675.
Thesis (Ph.D.)--Chinese University of Hong Kong, 2006.
Includes bibliographical references (p. 96-106).
Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Electronic reproduction. [Ann Arbor, MI] : ProQuest Information and Learning, [200-] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Abstracts in English and Chinese.
School code: 1307.
Veysey, John J. "Complex fluid dynamics : from laminar to geophysical flows /." 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3243016.
Full textSource: Dissertation Abstracts International, Volume: 67-11, Section: B, page: 6465. Adviser: Nigel Goldenfeld. Includes bibliographical references (leaves 243-257). Available on microfilm from Pro Quest Information and Learning.
Sinha, Anirban. "Dynamics and Stability of Multiple Jets in Geophysical Flows." Thesis, 2013. http://etd.iisc.ernet.in/2005/3418.
Full textOsmond, David. "Laboratory models of geophysical flows : lava domes on slopes and wind-driven convection at ocean fronts." Phd thesis, 2003. http://hdl.handle.net/1885/148566.
Full textVenayagamoorthy, Subhas Karan. "Turbulent mixing and dispersion in environmental flows." Thesis, 2002. http://hdl.handle.net/10413/4833.
Full textThesis (M.Sc.Eng.)-University of Natal, Durban, 2002.
Rodenborn, Bruce Edward. "The fluid dynamics of flagellar swimming by microorganisms and harmonic generation by reflecting internal, ocean-like waves." 2011. http://hdl.handle.net/2152/20664.
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Robin, Catherine M. I. "Diapirism on Venus and the Early Earth and The thermal effect of fluid flows in AECL's Tunnel Sealing Experiment." Thesis, 2010. http://hdl.handle.net/1807/24863.
Full textZidikheri, Meelis Juma. "Dynamical Subgrid-scale Parameterizations for Quasigeostrophic Flows using Direct Numerical Simulations." Phd thesis, 2007. http://hdl.handle.net/1885/49279.
Full textRao, Kaustubh J. "Numerical Forcing of Horizontally-Homogeneous Stratified Turbulence." 2011. https://scholarworks.umass.edu/theses/637.
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