Title page for ETD etd-042607-093941

Document Type	dissertation
Author Name	Linn, Anthony B
Email Address	ablinnpe at earthlink.net
URN	etd-042607-093941
Title	A Computational Study of Turbulent Structure Formation
Degree	PhD
Department	Mechanical Engineering
Advisors	William W Durgin, Advisor Gretar Tryggvason, Co-Advisor David J Olinger, Committee Member Homer F Walker, Committee Member Yiming Rong, Graduate Committee Rep
Keywords	mixing length vortical structure Turbulence
Date of Presentation/Defense	2007-05-03
Availability	unrestricted
Abstract Direct Numerical Simulation of channel flow was utilized to study the evolution of various vortex configurations presented as flow initial conditions. Simulations of longitudinally, laterally and cross-flow oriented vortices suggested that the predominant form of turbulent structure was the half hairpin vortex. This vortical structure was dominant in the simulations seen in this as well as other investigations. In all cases hairpin vortices quickly degenerated to half hairpin or inclined vortical structures. It is hypothesized that these structures function as the predominant momentum transfer mechanism within the boundary layer, entraining fluid into the vortex cores like miniature tornados and transporting this fluid to the top of the boundary layer while simultaneously dragging fluid viscously around the inclined core of the vortex causing mixing of low-speed and high-speed flows.
Files	Dissertation_Master_Linn.pdf Linn_TitlePage.pdf Linn_tst020_iso.avi

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