Abstract

In last five decades, Computational Fluid Dynamics (CFD) has become a mature technology and the CFD solvers are now regularly employed in the analysis and design of automobiles, aircrafts and a wide variety of other industrial applications. Despite of its wide usage, one of its building blocks, namely the ‘Turbulence Modeling’ still remains a pacing item in accurate computation of fluid flows; turbulence models are required in numerical simulation of turbulent flows using the Reynolds Averaged Navier-Stokes equations (RANS). Even though Direct Numerical Simulation (DNS) and Large Eddy Simulation (LES) can provide better accuracy, the needed computing power at present is prohibitive for complex 3D applications. The goal of this research has been to develop accurate and efficient one-equation turbulence models to increase the accuracy of simulations for flow over rough wall flows and flows with mild separation. The development is based on recently proposed one-equation eddy viscosity RANS models which are known as the Wray-Agarwal (WA) model and the two-equation k-kL-ARSM model. The two proposed modified one-equation models are validated by NASA Turbulence Modeling Resource (TMR) benchmark test cases; both the models provide competitive results compared to the one-equation Spalart-Allmaras (SA) model and one-equation k-kL model.

Committee Chair

Dr. Ramesh Agarwal

Committee Members

Dr. David Peters Dr. Swami Karunamoorthy

Comments

Permanent URL: https://doi.org/7936/5bb3-cv66

Degree

Master of Science (MS)

Author's Department

Mechanical Engineering & Materials Science

Author's School

McKelvey School of Engineering

Document Type

Thesis

Date of Award

Spring 5-2019

Language

English (en)

Author's ORCID

https://orcid.org/0000-0001-6532-0329

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