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 31 for “"gravity currents"”.
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Viscous fingering instabilities and gravity currents.–—
… studied in this thesis: a single-layer viscous gravity current spreading from a point source over a rigid surface, radial spreading of an intrusion displacing miscible fluid in a Hele-Shaw cell, and finally, a viscous gravity current spreading from a constant-flux point source over a uniform …
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Interface pinning of CO₂ gravity currents
… the relative strength of capillarity relative to gravity, as measured by the inverse of the Bond number. We demonstrate that capillary pressure hysteresis in porous media is caused by the fundamental difference in pore-scale invasion patterns between drainage and imbibition. In addition, we …
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Aquatic gravity currents through emergent vegetation
… effects of aquatic vegetation on these currents. This study investigates the dynamics of lock-exchange flows, a particular class of density currents, propagating through rigid emergent vegetation. First, previous mathematical formulation is extended to develop theoretical models of …
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Mixing in axisymmetric gravity currents and volcanic conduits
… fluid into axisymmetric high Reynolds number gravity currents. A series of laboratory experiments were conducted in which small scale gravity currents travelled along a wedge shaped channel with an increasing width in the downstream direction. The channel was filled with fresh water and the …
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Variational multi-scale modeling for particle-laden gravity currents over flat and triangular wavy terrains
… method for simulating dilute particle-laden currents at large Reynolds number Re = 10000. The physical model is based on the coupling balance of fluid momentum and convection and diffusion. We derive the RBVMS formulation for the weak form of governing equations, design the fine scale parameters …
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An experimental study on mixing induced by gravity currents on a sloping bottom in a rotating fluid
Mixing induced by gravity currents on a sloping bottom was studied through laboratory experiments in a rotating fluid. The dense fluid on the sloping bottom formed a gravity current that could be in regimes where the flow was laminar or had waves. The mixing on a sloping bottom for gravity currents …
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An experimental study on mixing induced by gravity currents on a sloping bottom in a rotating fluid
Mixing induced by gravity currents on a sloping bottom was studied through laboratory experiments in a rotating fluid. The dense fluid on the sloping bottom formed a gravity current that could be in regimes where the flow was laminar or had waves. The mixing on a sloping bottom for gravity currents …
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The flow of rivers into lakes: Experiments and models
… stratification in a basin fed by underflowing gravity currents was measured. The transport pathway of the inflowing fluid was visualised with dyes. Gravity currents underflowing uniform ambient uid over an intermediate range of source Reynolds number (Re_s) at constant Richardson number (Ri) …
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Sedimentation in a stratified ambient
… mass of particles in the form of plumes or gravity currents. We present the results of a combined theoretical and experimental study describing the evolution of particle clouds formed by the release of heavy particles. In the early stages of motion, particle clouds behave as turbulent fluid …
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Dynamics of deep-submarine explosive eruptions
… crossflow and consider the evolution of the gravity currents that form when these plumes interact with a solid boundary. We investigate the effect of the crossflow speed on the morphology of the gravity currents formed and compare the propagation of the flows with the classical theory of …
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Rotating gravity current and channel flows
… and laboratory Investigation of rotating gravity currents and channel flows is presented. The study is applicable to buoyancy driven flows through straits, mid ocean ridge valleys and fracture zones, and intermittent gravity currents. In the theoretical study two extensions are achieved to …
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On gravity-driven flow
… of scientific interest under the umbrella of gravity- driven flow. In the first problem we analyse the effect of curved boundaries on the evolution of finite-release low-Reynolds-number exchange flow. From the equations of motion in an annular geometry we derive the governing nonlinear PDE for …
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Modeling flow encountering abrupt topography using hybridizable discontinuous Galerkin projection methods
… steep topography, and the circulation of bottom gravity currents down a slope. Additionally, we investigate the implementation of open boundary conditions for finite element methods and present results in the context of our ocean simulations. Through this work we present the hybridizable …
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Overflows and upper ocean interactions : a mechanism for the Azores current
… seas. They enter the open ocean as dense gravity currents down a continental slope and play a crucial role in the deep ocean circulation. To understand the dynamics of these overflows, previous studies simplified their dynamics by treating the overlying ocean as inactive. This …
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Dynamics of downdruaghts and cold pools: an experimental and numerical study
… along the ground after impact as axisymmetric gravity currents, for example in the study performed by Rooney (2015). In this thesis both numerical and laboratory experiments have been performed by releasing finite volumes of dense fluid from cylinders of varying lengths. In the laboratory the …
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Sedimentology and Architecture of a Partially Contained Deposit, Cerro Solitario, Magallanes Basin, Chilean Patagonia
The depositional styles of sediment gravity currents depend, in part, on the relationship of flow magnitude to the scale of topographically controlled containment and range from unconfined lobes to fully contained deposits. Determining the degree of containment is important for understanding …
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Detrainment and Settling of Sediment in Turbidity Currents: A Study to Inform Deep Seabed Mining
… creation, and subsequent traveling, of turbidity currents across the seabed as a result of deep-sea mining will lead to impacts on a scale that is not yet entirely understood. Building on decades of studies on gravity currents (both related and unrelated to deep-sea mining) the focus of this …
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Overflows and upper ocean interaction : a mechanism for the Azores Current
… seas. They enter the open ocean as dense gravity currents down a continental slope and play a crucial role in the deep ocean circulation. To understand the dynamics of these overflows, previous studies simplified their dynamics by treating the overlying ocean as inactive. This …
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