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 91 for “"buoyancy-driven"”.
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Propulsion via buoyancy driven boundary layer
Heating a sloped surface generates a well-studied boundary layer flow, but the resulting surface forces have never been studied in propulsion applications. We built a triangular wedge to test this effect by mounting a resistive heating pad to one of its conducting sloped surfaces. We submerge the …
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Buoyancy-driven circulation in the Red Sea
This thesis explores the buoyancy-driven circulation in the Red Sea, using a combination of observations, as well as numerical modeling and analytical method. The first part of the thesis investigates the formation mechanism and spreading of Red Sea Overflow Water (RSOW) in the Red Sea. The …
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Buoyancy-driven circulation in the Red Sea
This thesis explores the buoyancy-driven circulation in the Red Sea, using a combination of observations, as well as numerical modeling and analytical method. The first part of the thesis investigates the formation mechanism and spreading of Red Sea Overflow Water (RSOW) in the Red Sea. The …
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Modeling buoyancy-driven airflow in ventilation shafts
… in outdoor air using non-mechanical forces. Buoyancy-driven systems are common in naturally ventilated commercial buildings because of their reliable performance in multi-story buildings. Such systems rely on atria or ventilation shafts to provide a pathway for air to rise through the …
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Instigating buoyancy driven convection to improve membrane distillation performance
Membrane distillation is a thermally driven desalination process that is capable of treating complicated wastewaters with high concentrations of dissolved solids. However, temperature polarization and concentration polarization reduce its distillate production and impede its industrial adoption. …
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Computational simulation of buoyancy-driven flows using vortex methods
… new vortex method for simulating two-dimensional buoyancy-driven flows is presented. This Lagrangian method utilizes a discrete representation of the known density field along with the vorticity transport equation and Boussinesq approximation to yield the baroclinically-generated vorticity field, …
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Experiments on the dynamics of buoyancy-driven flows in reactive porous media
… In these situations of slow flow, the effects of buoyancy may become important. Understanding these flows is important in a number of new industrial applications, such as geological disposal of nuclear waste. In this thesis, a series of new experiments are presented investigating the phenomena …
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Fluids Viscosity Effect on Non-Isothermal Buoyancy-Driven Exchange Flow in Inclined Pipes
Buoyancy-driven exchange flow is studied experimentally for different Atwood numbers, inclination angles and fluid pairs. The density difference drives the flow, that is achieved through added salinity for isothermal case and temperature difference for the non-isothermal case. Detailed benchmarking …
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Analysis of buoyancy driven airflow patterns in a model of a naturally ventilated building
… buildings use temperature gradients to create buoyancy forces in the space and drive the airflow pathways in the space. One architectural design feature that facilitates natural ventilation is the presence of stack ventilation in the roof of the building, which facilitates the expulsion of …
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Effects of Compressibility and Variable-Density on the Instability Growth within Buoyancy-Driven Shear Layers
… density (VD) on the instability growth within buoyancy-driven shear layers (BSL), which share characteristics with the canonical Rayleigh-Taylor (RT/RTI) and Kelvin-Helmholtz (KH/KHI) instabilities. The 2D simulations are performed in a periodic domain, with alternating columns of high and low …
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Evaluation of RANS-Based Turbulence Models for the Propagation of Stratified Fronts in Buoyancy-Driven Flow
… safe, utilizing physical phenomena such as buoyancy and natural convection to cool the core in the event forced circulation fails. However, the widely implemented Reynolds-averaged Navier-Stokes (RANS) approach to turbulence modeling has previously shown limitations in its ability to …
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Modeling of opening characteristics of an atrium in natural ventilation
… air circulation, and aesthetic requirements. Buoyancy-driven ventilation systems are common because they can maintain suitable thermal comfort and reduce energy. Modeling techniques used to simulate naturally ventilation include analytical models, full-scale and small-scale experiments, …
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Improving Seaglider Efficiency: An Analysis of Wing Shapes, Hull Morphologies, and Propulsion Methods
… environments. These gliders leverage changes in buoyancy and the resulting vertical motion, to generate forward locomotion via hydrodynamic surfaces. In order to function for extended periods, these systems operate in a low-speed, low-drag regime. This research examines factors impacting the …
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Stability of plane-front and dendritic solidification of binary liquids: The effects of rotation
… rotation about the vertical to suppress onset of buoyancy-driven convection is considered for plane-front solidification (PFS) and dendritic solidification (DeS).
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Numerical Flow Modeling of Artificial Upwelling
… upwelling concepts are studied: propeller-driven, wave-driven, and buoyancy-driven upwelling. While large propeller-driven upwelling devices are found to suffer from the tendency of the cold upwelled water to sink back out of the surface region, the results obtained for wave-driven devices …
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Turbulent entrainment in flows induced by distributed buoyancy sources
Free shear and wall-bounded buoyancy-driven turbulent flows occur in both natural environments and industrial situations. In this thesis, to better understand the entrainment process within these flows, experiments and theory have been used to investigate point and distributed buoyancy sources and, …
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Effect of initial conditions on the development of Rayleigh-Taylor instabilities
… are two coupled objectives for this study of buoyancy-driven turbulence. The first objective is to determine if the development of a Rayleigh-Taylor (RT) mixing layer can be manipulated experimentally by altering the initial condition of the experiment. The second objective is to evaluate the …
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Uncertainty quantification of engineering systems using the multilevel Monte Carlo method
… prototypical examples: structural vibrations and buoyancy driven flows through porous media. In the first example, the impact of random mass density is quantified for structural vibration problems in several dimensions using the multilevel Monte Carlo method. Comparable eigenvalues and energy …
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Hydrodynamic Modeling for Autonomous Underwater Vehicles Using Computational and Semi-Empirical Methods
Buoyancy driven underwater gliders, which locomote by modulating their buoyancy and their attitude with moving mass actuators and inflatable bladders, are proving their worth as efficient long-distance, long-duration ocean sampling platforms. Gliders have the capability to travel thousands of …
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