Title page for ETD etd-04242001-101038


Type of Document Master's Thesis
Author Qin, Lihai
URN etd-04242001-101038
Title Vorticity Modeling for the Flow Over Surface-Mounted Prisms
Degree Master of Science
Department Engineering Science and Mechanics
Advisory Committee
Advisor Name Title
Hajj, Muhammad R. Committee Co-Chair
Mook, Dean T. Committee Co-Chair
Ragab, Saad A. Committee Member
Keywords
  • numerical simulation
  • vortex shedding
  • prism
  • vorticity modeling
  • vortex element
  • bluff body
  • turbulence
Date of Defense 2001-04-02
Availability unrestricted
Abstract
Vorticity modeling is used to simulate the flow around a surface-mounted prism. The objective is

to examine whether vorticity modeling can give satisfactory information about surface pressure

fluctuations which are mostly due to the outer or inviscid flow. Differences between results

obtained with vorticity modeling and what one should expect from DNS and LES are pointed

out. These include the difference between the governing equations, the shortcomings of having a

2-D simulation and the realization of introducing and convecting vorticity to simulate some

turbulence aspects. All necessary details needed for the setup of vorticity modeling for complex

flows, such as the one considered here are given. These details include choice of elements, the

calculation of velocities, the application of boundary conditions and calculation of pressure. The

numerical procedure and our use of parallelization in the code are explained. The results

presented on velocity magnitude, vorticity and pressure show important characteristics of the

flow field in terms of interaction of positive and negative vorticities and their effects on the

surface pressure. The calculated peak and mean values for the pressure coefficients at the leading

edge are close to those measured in separating flows over prisms.

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  figurelist.pdf 3.41 Kb < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01
  pressure-fluctuation.pdf 51.19 Kb 00:00:14 00:00:07 00:00:06 00:00:03 < 00:00:01
  pressure.pdf 121.77 Kb 00:00:33 00:00:17 00:00:15 00:00:07 < 00:00:01
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  vita.pdf 2.08 Kb < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01
  vorticity.pdf 122.33 Kb 00:00:33 00:00:17 00:00:15 00:00:07 < 00:00:01

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