PhD Defense Olivia Martin “Computational Analysis of Screech and Internal Mixing Noise for Supersonic Aircraft Applications”

As computational resources continue to expand and CFD solvers become more advanced, there is a push to rely more heavily on computational acoustic predictions. The goal of this work is to evaluate the ability of high-fidelity large-eddy simulation (LES) to predict noise from jets with forced internal mixing. Far-field acoustics are predicted using the CharLES flow solver and compared with experimental measurements taken at NASA Glenn Research Center. The second goal of this thesis is to better understand the physics underlying jet screech in high aspect-ratio military-style rectangular jets. High-fidelity simulation data combined with linear stability theory is used to analyze properties of the GJM in various downstream regions in the jet.