Further development of an algebraic intermittency model for separation-induced transition under elevated free-stream turbulence
- Author
- Slawomir Kubacki, Daniele Simoni, Davide Lengani, Matteo Dellacasagrande and Erik Dick (UGent)
- Organization
- Abstract
- A constitutive law for the Reynolds stresses during boundary layer laminar-to-turbulent transition, constructed in previous work by elastic-net regression on an experimental data base, has been incorporated in an algebraic intermittency model. The objective is prediction improvement of transition in a separated layer under an elevated free-stream turbulence level. The modelling for such cases functions through additional production terms in the transport equations of turbulent kinetic energy and specific dissipation rate of a k-ω turbulence model. A sensor detects the front part of a separated layer and activates the production terms. These express the effect of Klebanoff streaks generated upstream of separation on the Kelvin-Helmholtz instability rolls in the separated part of the layer. By the Klebanoff streaks, the breakdown is faster and the speed of breakdown increases by the combined effects of a large adverse pressure gradient and an elevated free-stream turbulence level.
- Keywords
- Boundary layer flow, laminar-to-turbulent transition, separation-induced transition, algebraic transition model
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Citation
Please use this url to cite or link to this publication: http://hdl.handle.net/1854/LU-8739021
- MLA
- Kubacki, Slawomir, et al. “Further Development of an Algebraic Intermittency Model for Separation-Induced Transition under Elevated Free-Stream Turbulence.” ETC14 / 2021 :14th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics, Proceedings, European Turbomachinery Society (Euroturbo), 2021, doi:10.29008/etc2021-512.
- APA
- Kubacki, S., Simoni, D., Lengani, D., Dellacasagrande, M., & Dick, E. (2021). Further development of an algebraic intermittency model for separation-induced transition under elevated free-stream turbulence. ETC14 / 2021 :14th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics, Proceedings. Presented at the 14th European Conference on Turbomachinery Fluid Dynamics & Thermodynamics, Gdansk, Poland. https://doi.org/10.29008/etc2021-512
- Chicago author-date
- Kubacki, Slawomir, Daniele Simoni, Davide Lengani, Matteo Dellacasagrande, and Erik Dick. 2021. “Further Development of an Algebraic Intermittency Model for Separation-Induced Transition under Elevated Free-Stream Turbulence.” In ETC14 / 2021 :14th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics, Proceedings. European Turbomachinery Society (Euroturbo). https://doi.org/10.29008/etc2021-512.
- Chicago author-date (all authors)
- Kubacki, Slawomir, Daniele Simoni, Davide Lengani, Matteo Dellacasagrande, and Erik Dick. 2021. “Further Development of an Algebraic Intermittency Model for Separation-Induced Transition under Elevated Free-Stream Turbulence.” In ETC14 / 2021 :14th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics, Proceedings. European Turbomachinery Society (Euroturbo). doi:10.29008/etc2021-512.
- Vancouver
- 1.Kubacki S, Simoni D, Lengani D, Dellacasagrande M, Dick E. Further development of an algebraic intermittency model for separation-induced transition under elevated free-stream turbulence. In: ETC14 / 2021 :14th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics, Proceedings. European Turbomachinery Society (Euroturbo); 2021.
- IEEE
- [1]S. Kubacki, D. Simoni, D. Lengani, M. Dellacasagrande, and E. Dick, “Further development of an algebraic intermittency model for separation-induced transition under elevated free-stream turbulence,” in ETC14 / 2021 :14th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics, Proceedings, Gdansk, Poland, 2021.
@inproceedings{8739021,
abstract = {{A constitutive law for the Reynolds stresses during boundary layer laminar-to-turbulent transition, constructed in previous work by elastic-net regression on an experimental data base, has been incorporated in an algebraic intermittency model. The objective is prediction improvement of transition in a separated layer under an elevated free-stream turbulence level. The modelling for such cases functions through additional production terms in the transport equations of turbulent kinetic energy and specific dissipation rate of a k-ω turbulence model. A sensor detects the front part of a separated layer and activates the production terms. These express the effect of Klebanoff streaks generated upstream of separation on the Kelvin-Helmholtz instability rolls in the separated part of the layer. By the Klebanoff streaks, the breakdown is faster and the speed of breakdown increases by the combined effects of a large adverse pressure gradient and an elevated free-stream turbulence level.}},
articleno = {{ETC2021-512}},
author = {{Kubacki, Slawomir and Simoni, Daniele and Lengani, Davide and Dellacasagrande, Matteo and Dick, Erik}},
booktitle = {{ETC14 / 2021 :14th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics, Proceedings}},
issn = {{2410-4833}},
keywords = {{Boundary layer flow,laminar-to-turbulent transition,separation-induced transition,algebraic transition model}},
language = {{eng}},
location = {{Gdansk, Poland}},
pages = {{10}},
publisher = {{European Turbomachinery Society (Euroturbo)}},
title = {{Further development of an algebraic intermittency model for separation-induced transition under elevated free-stream turbulence}},
url = {{http://doi.org/10.29008/etc2021-512}},
year = {{2021}},
}
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