Combustion and flame dynamics
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Abstract
Abstract
Abstract Dynamic mode decomposition method is deployed to investigate the heat transfer mechanism in a compressible turbulent shear layer and shockwave. To this end, highly resolved Large Eddy Simulations are performed to explore the effect of wall thermal conditions on the behavior of a reattaching free shear layer interacting with an oblique shock in compressible turbulent flows. Various wall temperature conditions, such as cold adiabatic and hot wall, are considered. Dynamic mode decomposition is used to isolate and study the structures generated by the shear layer exposed in the boundary layer. Results reveal that the shear layer flapping is the most energetic mode. The hot wall gains the highest amplitude for the flapping frequency, and the vortical motions are most intense in the vicinity of the reattachment point of the heated wall. The vortex shedding due to the large-scale motion of the shear layer is associated with the second energetic mode. The cold wall not only has a higher amplitude of the shedding mode, but it also has a lower frequency compared to the adiabatic and hot walls. This work sheds light on the underlying physics of the nonlinear intercoupling of momentum and heat, hence providing guidelines for designing control systems for high speed flight vehicles and mitigating aircraft fatigue loading caused by intense wall pressure fluctuations and heat flux.
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@article{Zangeneh2026Unraveling,
title = {Unraveling Momentum and Heat Intercoupling in Reattaching Turbulent Boundary Layers Using Dynamic Mode Decomposition},
author = {Rozie Zangeneh},
journal = {International journal of computational fluid dynamics},
year = {2026},
doi = {10.1080/10618562.2026.2615936},
url = {https://doi.org/10.1080/10618562.2026.2615936}
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