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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

Boundary effect on ship-generated waves

鄭耀煥, Cheng, Yiu-woon. January 1998 (has links)
published_or_final_version / Mechanical Engineering / Master / Master of Philosophy
12

Near wake flow interactions of two square cylinders

趙遠宏, Chiu, Yuen-wang, Alex. January 1999 (has links)
published_or_final_version / Mechanical Engineering / Doctoral / Doctor of Philosophy
13

Fluid nonlinearities for calibrated VIV wake oscillator models

Kurishina, Victoria January 2018 (has links)
Onshore and offshore structures are subject of strict safety regulations, and acceptable design implies requirements for accurate models of potentially dangerous phenomena. The phenomenon of Vortex-Induced Vibrations (VIVs) develops when a slender structure interacts with a fluid flow. Vortices grow in the disturbed boundary layer and spread behind the structure, resulting in fluctuations of the fluid forces acting on the body. Slender structures are present almost everywhere in the form of tall buildings and skyscrapers, cranes, antennas, power lines, suspension bridges, umbilicals, risers and free spans of pipelines which deliver water, oil and gas. The deeper in the water and higher in the sky these structures are, more likely they can experience VIVs and the lock-in state due to the exposure to various flow profiles. The wake oscillator method allows to model fluid variables during VIV lock-in using self-excited and self-limited oscillators of Van der Pol or Rayleigh type. In this research, the capabilities of alternative nonlinear oscillators as fluid equations are considered for modelling elastically supported rigid structures with one and two degrees-of-freedom in uniform flow. For modelling two-dimensional flexible structures in uniform and sheared flows, new wake oscillator models are developed in this work and applied with alternative damping terms. The dynamics of the uniform flow model of flexible structure is investigated in detail with the focus on coexisting solutions of the displacement amplitudes. Empirical coefficients for wake oscillator models are calibrated in this study using constrained nonlinear minimization and experimental data available in the literature. The validation performed confirms the most successful results for the suite of models of 2DOF rigid structure for low mass ratio, where agreement with both in-line and cross-flow displacement records was obtained.
14

Turbulence prediction and measurement in a turbulent trailing vortex

Phillips, W. R. (William Robert) January 1974 (has links)
No description available.
15

Vortical inflow : propeller interaction using an unsteady three-dimensional Euler solver /

Choi, Jin Keun, January 2000 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 2000. / Vita. Includes bibliographical references (leaves 223-230). Available also in a digital version from Dissertation Abstracts.
16

Low-order coupled map lattices for estimation of wake patterns behind vibrating flexible cables

Balasubramanian, Ganapathi Raman. January 2003 (has links)
Thesis (Ph. D.)--Worcester Polytechnic Institute. / Keywords: fluid-structure interaction; low dimensional models; coupled map lattices; vortex shedding; cylinder wake patterns; flow control; multi-variable least squares algorithm; neural networks; adaptive estimation. Includes bibliographical references (p. 147-149).
17

Turbulence prediction and measurement in a turbulent trailing vortex

Phillips, W. R. (William Robert) January 1974 (has links)
No description available.
18

Splashless ship bows and waveless sterns /

Madurasinghe, M. A. D. January 1986 (has links) (PDF)
Thesis (Ph. D.)--University of Adelaide, Dept. of Applied Mathematics, 1987. / Includes bibliographical references (leaves 70-72).
19

Currents, coasts and cays : a study of tidal upwelling and island wakes /

Coutis, Peter F. January 2000 (has links)
Thesis (Ph. D.)--University of New South Wales, 2000. / Also available online.
20

The simulation of surface ship micro-bubble wakes /

Hyman, Mark C., January 1990 (has links)
Thesis (Ph. D.)--Virginia Polytechnic Institute and State University, 1990. / Vita. Abstract. Includes bibliographical references (leaves 70-86). Also available via the Internet.

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