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Turbulence structure of rough-bed open-channel flowStewart, Mark Thomas January 2014 (has links)
Open-channel flows are ubiquitous in nature and play a central role in many hydraulic engineering problems. This flow type occurs almost exclusively under fully-rough turbulent conditions and it is not uncommon for the relative submergence of these flows to be low. Despite this, most theory has so far been developed for smooth wall flows or rough-bed flows at high submergence while its applicability at low relative submergence remains questionable. This thesis therefore aims to contribute towards an improved understanding of turbulence structure in rough-bed open-channel flow at low to intermediate relative submergence. Experiments were conducted to collect turbulent velocity field data for nine different flow scenarios, covering roughness Reynolds numbers between 175 and 900, and relative submergence between 2.5 and 7.5. Each flow scenario was measured independently using particle image velocimetry (PIV) in five distinct configurations. The PIV system was first configured to make two-component velocity measurements with a very wide field of view (up to twenty flow depths) along the channel centreline in a streamwise-wall-normal plane. These measurements were supplemented with three-component stereoscopic PIV recordings along the same plane albeit with a shorter field of view. The third, fourth and fifth set ups involved stereoscopic PIV in three separate transverse-wall-normal planes and thus ensured the complete lateral coverage of the flow field from the sidewall to the centreline. The four-camera arrangement of each of the present stereoscopic PIV configurations was exploited to obtain velocity field statistics with significantly reduced contributions from measurement noise. The thesis reports distributions of bulk velocity statistics and spectra of all three velocity components. In addition, characteristic large scale features of the instantaneous flow are examined using velocity field visualisation, two-point velocity correlations and premultiplied velocity spectra. Further analysis is carried out on the time-averaged flow field to visualise secondary current patterns and to study their lateral extent.
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A computational study of mixing in stratified liquid-liquid flows using analogy between heat and mass transferBurt, Andrew C. January 2001 (has links)
Thesis (M.S.)--West Virginia University, 2001. / Title from document title page. Document formatted into pages; contains x, 76 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 71-72).
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Developing DNS tools to study channel flow over realistic plaque morphology /Beaumont, Ryan M., January 2007 (has links)
Thesis (M.S.) in Mechanical Engineering--University of Maine, 2007. / Includes vita. Includes bibliographical references (leaves 54-57).
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Energy changes in disturbed liquid turbulent flowDay, Harold J. January 1963 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1963. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 122-125).
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The dynamics of variable-density turbulence /Sandoval, Donald Leon. January 1995 (has links)
Thesis (Ph. D.)--University of Washington, 1995. / Vita. Includes bibliographical references (leaves [208]-216).
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Turbulence modeling of solar convectionTera, Sridhar R. January 2007 (has links)
Thesis (M.S.)--University of Nevada, Reno, 2007. / "August, 2007." Includes bibliographical references (leaves 73-74). Online version available on the World Wide Web.
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Numerical simulation of laminar and turbulent flows of wellbore fluids in annular passages of arbitrary cross-section /Azouz, Idir. January 1994 (has links)
Thesis (Ph.D.)-- University of Tulsa, 1994. / Includes bibliographical references (leaves 159-163).
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Coherent structures and two-dimensionalization in rotating turbulent flowRuppert-Felsot, Jori Elan. Swinney, H. L., January 2005 (has links) (PDF)
Thesis (Ph. D.)--University of Texas at Austin, 2005. / Supervisor: Harry L. Swinney. Vita. Includes bibliographical references.
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Study of the 'Poor Man's Navier Strokes' equation turbulence modelBible, Stewart Andrew. January 2003 (has links) (PDF)
Thesis--University of Kentucky (M.S.), 2003. / Title from document title page. Document formatted into pages; contains ix, 110 p. : ill. Includes abstract and vita. Includes bibliographical references (p. 99-109).
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The behavioral effect of laboratory turbulence on copepodsRasberry, Katherine Denise. January 2005 (has links)
Thesis (M. S.)--Civil and Environmental Engineering, Georgia Institute of Technology, 2006. / Webster, Donald, Committee Chair ; Yen, Jeannette, Committee Member ; Roberts, Philip, Committee Member.
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