Theses and Dissertations

ORCID

https://orcid.org/0009-0004-2420-5761

Issuing Body

Mississippi State University

Advisor

Bhushan, Shanti

Committee Member

Zope, Anup

Committee Member

Hwang, Joonsik

Date of Degree

12-13-2024

Original embargo terms

Worldwide

Document Type

Graduate Thesis - Open Access

Major

Mechanical Engineering

Degree Name

Master of Science (M.S.)

College

James Worth Bagley College of Engineering

Department

Michael W. Hall School of Mechanical Engineering

Abstract

In the present work, we aim to investigate the predictive capabilities of low and high-fidelity turbulence models and understand how they perform in complex conditions in a scramjet engine. In this study, we use the DLR experiments to present a comparative performance assessment of low to high fidelity turbulence models. The DLR case is interesting since it exhibits turbulence due to wall effects as well as due to shear layer. Results show relatively good agreement when compared against the validation data set from the experiment. DHRL was able to resolve more turbulence structures compared to all other models. HRL showed better prediction of the momentum deficit in the wake of the strut than all other models. Additionally results for reacting case show that choice of turbulence models affects the intensity and lift-off distance of the flame where RANS and DHRL show the most rigorous flame and a smooth peak in temperature profile near the base of the strut at the centerline while IDDES and HRL show no combustion at the same location. Comparison against computational results shows an underprediction of the flame lift-off distance.

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