Committee Chair

Ranjan, Reetesh

Committee Member

Sreenivas, Kidambi; Elliott, Trevor; Arabshahi, Abdollah

Department

Dept. of Mechanical Engineering

College

College of Engineering and Computer Science

Publisher

University of Tennessee at Chattanooga

Place of Publication

Chattanooga (Tenn.)

Abstract

Large-eddy simulation (LES) is a computationally viable strategy to study particle-laden turbulent flows in practically relevant configurations, although modeling challenges need to be addressed for improved predictive capabilities. In this study, we perform a comprehensive assessment of subgrid-scale (SGS) models for LES by considering a two-way coupled particle-laden turbulent flow over a backward-facing step. We consider dynamic eddy viscosity, wall-adapting local eddy viscosity (WALE), and dynamic one-equation models for the closure of the SGS stress tensor, and the random walk (RW) and the differential filter (DF) based models for the subgrid dispersion. The assessment of subgrid models is carried out by comparison of simulation results against the available experimental data. Based on the assessment studies, the WALE model for the SGS stress tensor and the RW model for the subgrid dispersion are considered to examine the effects of inertia, coupling, and polydispersity on the statistics of carrier and dispersed phases.

Acknowledgments

I would like to offer my gratitude to my research advisor and thesis advisor, Dr. Reetesh Ranjan, for his unwavering support during the completion of this work. It would not have been possible without his consistent guidance along the way. I would also like to extend my gratitude to my thesis committee members, Dr. Kidambi Sreenivas, Dr. Trevor Elliott, and Dr. Abdollah Arabshahi for their continued support during my graduate program at UTC. I want to thank the Fluids and Combustion Modeling Group members, specifically Eli Durant and Robert Smith, for their assistance during the writing of this thesis. A special thank you goes out to the UTC College of Engineering and Computer Science's technical and administrative staff, particularly Ms. Andrea James, for resolving any issues that I faced. I also want to thank the SimCenter administrative staff, specifically Ms. Kim Sapp, for her support with any issues that I faced. I gratefully acknowledge the support of the SimCenter for the Center of Excellence in Applied Computational Science and Engineering (CEACSE) 2020-2021 grant that funded this research, as well as providing the computational resources and technical support to complete this thesis.

Degree

M. S.; A thesis submitted to the faculty of the University of Tennessee at Chattanooga in partial fulfillment of the requirements of the degree of Master of Science.

Date

12-2021

Subject

Multiphase flows--Mathematical models; Turbulence

Keyword

Large-eddy simulation; Particle-laden flow; Subgrid modeling; Separating/reattaching flow; Polydispersity; Two-way coupling;

Document Type

Masters theses

DCMI Type

Text

Extent

xv, 102 leaves

Language

English

Rights

http://rightsstatements.org/vocab/InC/1.0/

License

http://creativecommons.org/licenses/by-sa/4.0/

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