Laminar-Turbulent Transition in a Swept Low-Speed Boundary Layer

Ladan Bahrainirad, Shirzad Hosseinverdi, Hermann F. Fasel

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Evolution of three-dimensional disturbances in an accelerating swept laminar boundary layer is investigated by direct numerical simulations and linear parabolized stability equations (PSE). First, so-called controlled transition simulations were carried out where a single unsteady secondary instability wave is added to the baseflow distorted by a stationary primary crossflow vortex, and the nature of secondary instability regimes was identified. Next, the development of a three-dimensional wave packet was investigated, where the wave packet is generated by a localized short-duration pulse disturbance. DNS data support the results obtained from a PSE analysis, namely that the underlying baseflow is unstable with respect to both stationary and traveling crossflow modes with a wide range of frequencies and spanwise wavenumbers, whereby traveling crossflow modes are reaching the largest maximum amplitudes. Nonlinear mechanisms eventually trigger the transition process, as the wave packet breakdown to turbulent patches.

Original languageEnglish (US)
Title of host publicationAIAA AVIATION 2022 Forum
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624106354
StatePublished - 2022
EventAIAA AVIATION 2022 Forum - Chicago, United States
Duration: Jun 27 2022Jul 1 2022

Publication series

NameAIAA AVIATION 2022 Forum


ConferenceAIAA AVIATION 2022 Forum
Country/TerritoryUnited States

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Nuclear Energy and Engineering
  • Aerospace Engineering


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