Numerical Simulation of Turbulent Particle Diffusion

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.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Aerospace Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2015

Author dc:creator

• Bocksell, Todd Leslie

Contributors dc:contributor

• Loth, Eric

• Engineering, Aerospace

Language dc:language

eng

Identifier

(MiAaPQ)AAI3130882

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/85084