Date of Award

3-23-2018

Document Type

Thesis

Degree Name

Master of Science in Aeronautical Engineering

Department

Department of Aeronautics and Astronautics

First Advisor

Jeffrey Komives, PhD.

Abstract

The direct simulation of turbulent flows is prohibitive at high Reynolds numbers; thus, methods such as RANS and LES are used. However, these methods still require a large number of cells near a solid boundary. To circumvent this issue, a Wall-Modeled Large Eddy Simulation (WM-LES) can be used. Of interest is how these wall models perform in comparison to a Wall-Resolved Large Eddy Simulation (WR-LES) and experimental results of a shock turbulent boundary layer interactions (STBLI) and specifically, whether equilibrium wall models are sufficient to resolve the oscillatory and hence non-equilibrium nature of these flows or whether a non-equilibrium model is necessary. Using a swept-compression ramp it was found that an equilibrium model is insufficient in determining large scale features such as separation and reattachment locations as well as specific flow quantities such as wall shear. A non-equilibrium model did better in predicting both large scale features and specific flow quantities but produced a non-physical secondary reattachment leading to a need for further research into the specific model.

AFIT Designator

AFIT-ENY-MS-18-M-277

DTIC Accession Number

AD1056609

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