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.
Results
Showing 1 to 20 of 45 for “"Vortex dynamics"”.
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Geostrophic vortex dynamics
By generalizing the method of contour dynamics to the quasigeostrophic two layer model, we have proposed and solved a number of fundamental problems in the dynamics of rotating and stratified vorticity fields. A variety of rotating and translating potential vorticity equilibria (V-states) in one …
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Geostophic vortex dynamics
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmosphere and Planetary Sciences, 1988.
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Vortex Dynamics and Energetics in Left Ventricular Flows
… are generated in the left ventricle (LV) due to vortex formation (roll-up of shear layers shed past the valve leaflets), turbulence characteristics, and energetics. The flow through pivoted leaflets of MHVs induces a combination of flow characteristics that are dependent on the specific valve …
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Phase transitions and vortex dynamics in superconducting island arrays
… island arrays as a platform for studying vortex motion and quantum phase transitions. We investigate superconducting vortex dynamics and lattice structures in superconducting arrays by performing electrical transport measurements on Nb island arrays on Au at milli-kelvin temperatures and …
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A numerical study of vortex dynamics over rigid ripples
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1988.
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Imaging vortex dynamics in Josephson arrays using magnetic force microscopy
Vortices and vortex lattices play a major role in determining the transport properties of type-II superconductors[1–3], and enable a platform to investigate exotic superconducting physics[4,5]. The study of vortex matter has generally focused on novel states in 2D films and structures, and has …
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Numerical investigations of vortex dynamics: bursting, twist waves, and sensitivity analysis
… of high Reynolds number turbulent flows. Their dynamics are governed by non-linear processes, leading to a range of vortical instabilities that significantly influence engineering applications. Despite decades of research, many questions remain about core mechanisms responsible for the dynamic …
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Vortex dynamics and forces in the laminar wakes of bluff bodies
Coherent vortex-dominated structures in the wake are ubiquitous in natural and engineered flows. The well-known 'von Karman street', in which two rows of counter-rotating vortices develop on the leeward side of a solid body immersed in a fluid, is only one such vortex-based structure in the wake. …
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Proximity effects and vortex dynamics in mesoscopic superconductor-normal metal-superconductor arrays
… understand these systems, we characterize the vortex dynamics intrinsic to the 2D superconducting ground state, as well as that in response to an externally applied current and magnetic field. We provide evidence that the superconducting state is characterized by bound vortex-antivortex pairs. …
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Modeling of Rotor Wake Vortex Dynamics and Interactions in Non-Homogenous Vertiport Environments
… utilizes an open source Computational Fluid Dynamics (CFD) software known as OpenFOAM to generate calculate and visualize these runs. The model used for this experiment is a hybrid model that employs both a Unsteady Reynolds-Averaged Navier-Stokes (URANS) and a detached eddy simulation using …
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Effect of disorder on the vortex dynamics in superconducting Josephson junction arrays and clusters
… model in real space to understand the static vortex configurations and the motion of the vortices.
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Forecasting the lift of a randomly maneuvering airfoil under dynamic stall conditions, Re ∼ 10⁵
… the dynamic stall to the chord-lengthscale vortex dynamics. However, further analysis suggests that the forecast predominantly relies on the lower frequency components tied to the airfoil motion, possibly because the vortex dynamics are dependent on and sensitive to the airfoil motion. …
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Modeling and Large Scale Simulations of Thermohaline and Particulate Density Currents
The simulations show in great detail the dynamics of the flow and the rich interaction between turbulent structures with a wide range of scales. Front spreading velocity, Kelvin-Helmholtz vortex dynamics, lobe and cleft formation and evolution, flow patterns, and bed shear stress patterns, are …
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Near field behavior of reacting free jets
… elliptical jet exhibited out-of-plane vortex dynamics and subsequently, structure merging primarily contained within the minor axis region. Chemical reaction hindered out-of-plane vortex motion causing the reacting jet to form primarily planar vortex rings. The overall structure and …
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Strongly Correlated Electronic Matter: Phases and their Transport
… in rotating Bose Einstein condensates using vortex dynamics.
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Understanding Jupiter’s Polar Vortex Crystals
This thesis explores vortex dynamics on background planetary potential vorticity (PV) gradients caused by planetary rotation. Using a quasi-geostrophic (QG) pseudo-spectral model, we investigated the formation of opposing PV annuli that form on the vortex edges as a result of this drift known as a …
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Understanding Jupiter’s Polar Vortex Crystals
This thesis explores vortex dynamics on background planetary potential vorticity (PV) gradients caused by planetary rotation. Using a quasi-geostrophic (QG) pseudo-spectral model, we investigated the formation of opposing PV annuli that form on the vortex edges as a result of this drift known as a …
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The superconducting proximity effect in Bi2Se3 thin-films
… of the islands leads to correlated transport and vortex dynamics in the topological insulator wire. These devices may serve as an ideal platform for further investigation into Majorana physics and other manifestations of the topological nature of the Bi2Se3 wires.
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Towards a holographic description of pulsar glitch mechanism
… plausible theories of pulsar glitches involving vortex dynamics. The second major thrust of this thesis is in reviewing the application of AdS/CFT in study of strongly-coupled condensed matter systems, with special attention to the models of holographic superfluidity that admit vortex-like …
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Measurements of Vortex Diffusivity in 2d Superfluid Helium-4
… for the first time the characteristics of vortex induced superfluid flow dissipation at temperatures well below the Kosterlitz-Thouless superfluid transition temperature. Our studies are with films of coverage .25 < (sigma)(,s) < 1.9 superfluid atomic layers and with .55 < T(,KT) < …
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