Bypass transition in boundary layers as an activated process
Kreilos T, Khapko T, Schlatter P, Duguet Y, Henningson DS, Eckhardt B (2015)
Publication Type: Conference contribution
Publication year: 2015
Publisher: TU Delft
Conference Proceedings Title: Proceedings - 15th European Turbulence Conference, ETC 2015
Event location: Delf, NLD
Abstract
We consider the spatio-temporal aspects of the transition to turbulence in a boundary layer above a flat plate exposed to free-stream turbulence. Combining results from the receptivity to free-stream turbulence with the observation of a double threshold from transition studies in e.g. pipe flow we arrive at a physically motivated prediction for the spatial distribution of nucleation events in boundary layers. We use a cellular automaton to implement a complete model for the spatial and temporal evolution of turbulent patches and show that the model reproduces the statistical features of the boundary layer remarkably well. The success of the modeling shows that bypass transition occurs as a spatiotemporally activated process, where transition is triggered by critical fluctuations imported from the free-stream turbulence.
Authors with CRIS profile
Involved external institutions
Royal Institute of Technology / Kungliga Tekniska Högskolan (KTH)
Sweden (SE)
École Polytechnique Fédérale de Lausanne (EPFL)
Switzerland (CH)
Computer Science Laboratory for Mechanics and Engineering Sciences / Laboratoire d'informatique pour la mécanique et les sciences de l'ingénieur (LIMSI-CNRS)
France (FR)
Philipps-Universität Marburg
Germany (DE)
Sweden (SE)
École Polytechnique Fédérale de Lausanne (EPFL)
Switzerland (CH)
Computer Science Laboratory for Mechanics and Engineering Sciences / Laboratoire d'informatique pour la mécanique et les sciences de l'ingénieur (LIMSI-CNRS)
France (FR)
Philipps-Universität Marburg
Germany (DE)
How to cite
APA:
Kreilos, T., Khapko, T., Schlatter, P., Duguet, Y., Henningson, D.S., & Eckhardt, B. (2015). Bypass transition in boundary layers as an activated process. In Proceedings - 15th European Turbulence Conference, ETC 2015. Delf, NLD: TU Delft.
MLA:
Kreilos, Tobias, et al. "Bypass transition in boundary layers as an activated process." Proceedings of the 15th European Turbulence Conference, ETC 2015, Delf, NLD TU Delft, 2015.
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