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Unsteady pressure and vorticity fields in blade-vortex interactions /Pesce, Matthew M. January 1990 (has links)
Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1990. / Vita. Abstract. Includes bibliographical references (leaves 29-31). Also available via the Internet.
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Investigation on street vortex簡志明, Kan, Chi-ming, Dominic. January 1982 (has links)
published_or_final_version / Mechanical Engineering / Master / Master of Science in Engineering
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Flow and combustion in vortical structuresAtobiloye, R. Z. January 1994 (has links)
No description available.
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Theoretical and experimental studies of confined vortex flowReydon, Raoul Fran,cois. January 1978 (has links)
No description available.
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Analysis and identification of vortices within a turbulent channel boundary layer flowMaroni Veiga, Adrian Gaston 16 August 2006 (has links)
Vortical structures are regarded as the dominant organized patterns in wall
turbulence. They play a key role in physical phenomena of practical importance such as
energy and momentum transport, combustion, mixing, and noise and drag production.
Considerable investigations have been performed in drag and noise phenomena studies,
with a main purpose of controlling and reducing them. Various techniques to control the
drag reduction have been studied for over last five decades; however, the detailed
understanding of the drag reduction mechanism is still lacking. Vortices play an
important role in turbulence structure. Nevertheless, the identification of vortices is still
unclear, not even a universal definition of a vortex is accepted.
In the present study, several vortex feature extraction schemes are implemented.
The methods are applied to analyze instantaneous two-dimensional velocity fields
obtained by particle tracking Velocimetry (PTV) measurements of a turbulent channel
flow with and without microbubble injection within the boundary layer. Microbubble
injection is one of the drag reduction techniques, first studied in early 1970s, that has
undergone extensive research in past years, and the generated information has aided into drag reduction understanding.
As a general rule, vortex extraction methods can be either a simple visualization
scheme or more sophisticated identification tools. The Reynolds decomposition and its
variants are suitable due to their capacity to mark vortices advecting at different
velocities. In the case of identification techniques, which yield a scalar field calculated
from either the velocity vector field or the velocity gradient tensor, both the modified
swirling strength Λci or the λ2 criteria were found to be well suited for vortex
identification.
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Spontaneous vortices in ferromagnet-superconductor systemsWei, Hongduo 16 August 2006 (has links)
We study the interaction between superconductors and ferromagnets in two
systems: a ferromagnet-superconductor bilayer, and a thin superconducting film with
a periodic array of magnetic dots upon it, with spontaneous vortices appearing in the
systems. We show that the superconducting phase transition is of the first order in a
ferromagnet-superconductor bilayer and of the second order in the superconducting
film with a periodic array of magnetic dots upon it. The shift of the transition
temperature, (delta)Tc, due to the presence of a ferromagnetic layer may be positive or
negative in the ferromagnet-superconductor bilayer and is always negative in the
superconducting film with a periodic array of magnetic dots upon it. The dependence
of (delta)Tc on geometrical factors and the external magneticfield is found. The theory
is extended to multilayer structures. Next, we study the anisotropy dependence of
the critical current in a thin superconducting film with a periodic array of magnetic
dots with magnetization perpendicular to the film with spontaneous vortices and
antivortices. The phase diagrams for the appearance of spontaneous vortices and
antivortices are given for the square arrays of circular and square F dots respectively
when the direction of the magnetization is parallel to the superconducting film.
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Singularities in the spatial complex plane for vortex sheets and thin vortex layersGolubeva, Natalia Yurievna, January 2003 (has links)
Thesis (Ph. D)--Ohio State University, 2003. / Title from first page of PDF file. Document formatted into pages; contains xiii, 132 p.: ill. Includes abstract and vita. Advisor: Gregory R. Baker, Dept. of Mathematics. Includes bibliographical references (p. 131-132).
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Investigation on street vortex /Kan, Chi-ming, Dominic. January 1982 (has links)
Thesis--M. Sc., University of Hong Kong, 1982.
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Vortex breakdown-tail interaction /Kim, Younjong, January 2002 (has links)
Thesis (Ph. D.)--Lehigh University, 2003. / Includes vita. Includes bibliographical references (leaves 121-126).
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An experimental study of vortex flowNeuls, Allen Scott, 1943- January 1971 (has links)
No description available.
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