Interaction Between a Spherical Particle and Wall -Bounded Flows at Finite Reynolds Number
Zeng, Lanying
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https://hdl.handle.net/2142/87744
Description
Title
Interaction Between a Spherical Particle and Wall -Bounded Flows at Finite Reynolds Number
Author(s)
Zeng, Lanying
Issue Date
2007
Doctoral Committee Chair(s)
Balachandar, S.
Department of Study
Theoretical and Applied Mechanics
Discipline
Theoretical and Applied Mechanics
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Physics, Fluid and Plasma
Language
eng
Abstract
Thirdly, we investigate the interaction of a finite-sized particle embedded in a turbulent channel flow. Particles of various sizes have been located at two specific wall-normal locations, the buffer region and the channel center. Near-wall region mechanisms are observed consisting of such different events as bursting, sweep, and ejection, whereas channel center can be considered as nearly isotropic turbulence. We compare the computed forces with the standard force formulations and analyze possible mechanisms for their deviations. Further, we analyze the back effects that the particle imposes on the turbulence field---in particular, the wake responses to the ambient turbulence and the turbulence modulation by the particle for the energy and wall shear stress.
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