Effect of localized wall cooling or heating on streaks in high-speed boundary layers

Omar Es Sahli, Adrian Sescu, Mohammed Z. Afsar, Yuji Hattori, Makoto Hirota

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Abstract

High-amplitude upstream disturbances and wall surface roughness elements trigger streamwise/Görtler vortices and the associated streaks in boundary layers over flat or concave surfaces. Following the transient growth phase, the fully-developed vortices become sensitive to inviscid secondary instabilities, which ultimately result in a premature transition to turbulence. Our work aims at investigating the effect of cooling/heating on the initiation and development of such streaks in an attempt to gain a better understanding of the conditions and governing mechanisms leading to secondary instabilities in high-speed compressible boundary layers. We conduct a parametric study via a robust and efficient numerical solution to the non-linear compressible boundary region equations (NCBRE) to identify the impact of varying the wall temperature on the development of streaks in supersonic and hypersonic boundary layer flows.
Original languageEnglish
Number of pages16
JournalAIAA Scitech 2021 Forum
Early online date4 Jan 2021
DOIs
Publication statusPublished - 11 Jan 2021
EventAIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2021 - Virtual, Online
Duration: 11 Jan 202115 Jan 2021

Keywords

  • localized wall cooling
  • heating
  • streaks
  • high-speed boundary layers

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