@inproceedings{6016adca8cd3494da71b0149f5ea70a9,
title = "Entropy-based modal decomposition of high-speed, vortex-dominated flows",
abstract = "A novel entropy normalization is proposed for application with proper orthogonal decomposition (POD) and other modal analysis techniques of highly compressible flows. This normalization demonstrates the traits of symmetry and positive-definiteness required of a normalization and takes advantage of thermodynamic entropy{\textquoteright}s monotonic behavior in compressible flows. Through its derivation this entropy norm also rigorously demonstrates the uniqueness and validity of the commonly-used Chu norm as a contraction about energy. The normalization has been applied to OVERFLOW implicit large-eddy simulation (ILES) results of a cone-slice-ramp in Mach 6 flow. This geometry exhibits a vortex-shock/wave-boundary/layer interaction with SWBLI and vortex instability. Decompositions calculated using the presented entropy normalization are compared to those performed using conventional Chu normalization. These entropy-based modes were used to identify and characterize coherent structures in the cone-slice-ramp flow field. POD analysis of the cone slice ramp uncovered evidence that vortex structures are persistent through SWBLIs.",
author = "Vogel, {Ethan A.} and Coder, {James G.}",
note = "Publisher Copyright: {\textcopyright} 2021, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.; AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2021 ; Conference date: 11-01-2021 Through 15-01-2021",
year = "2021",
language = "English (US)",
isbn = "9781624106095",
series = "AIAA Scitech 2021 Forum",
publisher = "American Institute of Aeronautics and Astronautics Inc, AIAA",
pages = "1--19",
booktitle = "AIAA Scitech 2021 Forum",
}