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 1343 for “"vortex"”.
-
Vortex Flows: The Dynamics of Shear Layers and Hill's Vortex
… by analyzing the nonlinear instability of free vortex layers and Hill's vortex. The evolution is calculated numerically employing the contour dynamics formulation. We show that the growth of small, monochromatic perturbations on unstable vortex layers leads to the development of elliptical …
-
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 …
-
Geostophic vortex dynamics
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmosphere and Planetary Sciences, 1988.
-
Total temperature separation in a Kármán vortex street with finite vortex cores
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1988.
-
On quantum vortex reconnections
… we study the reconnection between an inclined vortex ring and a straight vortex line, where the vortex ring inclination angle is varied. We analyze the evolution throughout the dynamics of the total length and curvature of the vortex filaments for different values of the inclination angle, as …
-
Underdamped vortex flow devices
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
-
Trailing vortex free-surface interaction
An investigation of the interaction of a trailing vortex with a free surface has been undertaken for the purpose of understanding the origin and scars and striations. Velocity and turbulence measurements have been carried out through the use of a Laser-Doppler-Velocimeter (LDV) for various …
-
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 …
-
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 …
-
Discrete superconducting vortex flow transistors
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
-
Experimental investigation of vortex refrigeration
Thesis: B.S., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1947
-
Analysis for Taylor vortex flow
Taylor vortex flow is one of the basic problems of nonlinear hydrodynamic stability. In contrast with the wide region of wavenumber predicted by the linear theory, experiments show that Taylor vortex flow only appears in a small region containing the critical wavenumber ß<sub>er</sub> This …
-
Robot-assisted acoustic vortex tweezers
… and solid particles. In recent years, acoustic vortex beams have garnered substantial attention for introducing novel manipulation paradigms to this field. Particularly, acoustic vortex beams generate a ring-shaped acoustic intensity pattern with a Gor'kov potential field, enabling precise …
-
Computational modelling of vortex shedding flows
… of a two--<:limensional CFD method for vortex shedding flows past square and circular cylinders. The overall approach can be regarded as a compromise between the accuracy and computational costs, especially for high-Reynolds number flows. The latter are modelled by variants of the k - E …
-
Sound scattering by a cylindrical vortex
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1954.
-
Airfoil Vortex Induced Vibration suppression devices
Vortex Induced Vibrations (VIV) is a major concern of the offshore oil industry. This problem leads to fatigue failure in the marine risers and causes costly replacement of the risers. Appendages such as helical strakes have proven that VIV can be eliminated but at the cost of increased drag. …
-
Experimental investigation of vortex tube and vortex nozzle for applications in air-conditioning, refrigeration, and heat pump systems
The Ranque-Hilsch vortex tube can separate an incoming high pressure fluid stream into two low pressure fluid streams with different temperatures. In this project, the applicability of expansion work recovery through vortex tube in heating and cooling cycles has been examined. Vortex tube thermal …
-
Phase front analysis of laminar vortex streets
… formation and development of a laminar vortex street behind a circular cylinder has been modelled as a Huygens-type wave process. The phase of a point next to the cylinder is defined by the amplitude and phase of secondary wavelet centres along the preceding vortexin the near wake. …
-
Understanding Vortex Reconnection in Complex Fluid Flows
… the reconnection process for three initial vortex tube set-ups; anti-parallel, orthogonal and anti-parallel with axial flow. From these we are able to identify each of the different reconnection processes observed and discussed for the magnetic reconnection case but not necessarily the …
-
Air jet vortex generators for wind turbines
Air jet vortex generators are a boundary layer control device and as such can effect a significant delay to the stall of an aerofoil. They can also reattach a separated flow, as long as the angle of attack is less than the air jets 'on' stall angle. A wind tunnel model was built and tested and then …
Page 1 of 68