Numerical Simulation of Turbulent Particle Diffusion
Bocksell, Todd Leslie
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https://hdl.handle.net/2142/85084
Description
Title
Numerical Simulation of Turbulent Particle Diffusion
Author(s)
Bocksell, Todd Leslie
Issue Date
2004
Doctoral Committee Chair(s)
Loth, Eric
Department of Study
Aerospace Engineering
Discipline
Aerospace Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Aerospace
Language
eng
Abstract
To accurately simulate particles in wall-bounded flows with the CRW model, a modified Markov chain based on a normalized velocity fluctuation was found to be important to avoid unphysical wall-ward particle fluxes. Also, the incremental drift velocity for the Markov chain (required for inhomogeneous turbulent flows) was extended to include effects of particle inertia and virtual mass to enable simulation for a wide range of Stokes numbers. The CRW results with the finite Stokes incremental drift velocity and the modified Markov chain agreed well the DNS results for long-time diffusion once effects of anisotropy in turbulent kinetic energy, integral time scale, and integral length scale were included.
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