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@inproceedings{Kamal:2021:10.2514/6.2021-2827,
author = {Kamal, O and Rigas, G and Lakebrink, MT and Colonius, T},
doi = {10.2514/6.2021-2827},
title = {Input/Output Analysis of Hypersonic Boundary Layers using the One-Way Navier-Stokes (OWNS) Equations},
url = {http://dx.doi.org/10.2514/6.2021-2827},
year = {2021}
}

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TY  - CPAPER
AB  - Accurate prediction of linear amplification of disturbances in hypersonic boundary layers is computationally challenging. While direct numerical simulations and global analysis can be used to compute optimal (worst-case) forced responses, their large computational expense render these tools less practical for large design parameter spaces. At the same time, parabolized stability equations can be unreliable for problems involving multi-modal and non-modal interactions. To bridge this gap, we apply an approximate fast marching technique, the One-Way Navier-Stokes (OWNS) Equations, in iterative fashion to solve for optimal disturbances. OWNS approximates a rigorous parabolization of the equations of motion by removing disturbances with upstream group velocity using a higher-order recursive filter. Using OWNS, we aim to characterize disturbances of flat-plate and complex-geometry hypersonic boundary layers over a range of Mach numbers, and find optimal disturbances under different cost functions that define corresponding receptivity problems. The calculation of optimal disturbances reveals multi-modal transition scenarios depending on the spatial support, frequency, and physical nature of the external disturbances.
AU  - Kamal,O
AU  - Rigas,G
AU  - Lakebrink,MT
AU  - Colonius,T
DO  - 10.2514/6.2021-2827
PY  - 2021///
TI  - Input/Output Analysis of Hypersonic Boundary Layers using the One-Way Navier-Stokes (OWNS) Equations
UR  - http://dx.doi.org/10.2514/6.2021-2827
ER  -

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