An extended version of an algebraic intermittency model for prediction of separation-induced transition at elevated free-stream turbulence level
- Author
- Slawomir Kubacki (UGent) , Daniele Simoni, Davide Lengani and Erik Dick (UGent)
- Organization
- Abstract
- An algebraic intermittency model for boundary layer flow transition from laminar to turbulent state, is extended using an experimental data base on boundary layer flows with various transition types and results by large eddy simulation of transition in a separated boundary layer. The originating algebraic transition model functions well for bypass transition in an attached boundary layer under a moderately high or elevated free-stream turbulence level, and for transition by Kelvin–Helmholtz instability in a separated boundary layer under a low free-stream turbulence level. It also functions well for transition in a separated layer, caused by a very strong adverse pressure gradient under a moderately high or elevated free-stream turbulence level. It is not accurate for transition in a separated layer under a moderately strong adverse pressure gradient, in the presence of a moderately high or elevated free-stream turbulence level. The extension repairs this deficiency. Therefore, a sensor function for detection of the front part of a separated boundary layer activates two terms that express the effect of free-stream turbulence on the breakdown of a separated layer, without changing the functioning of the model in other flow regions. The sensor and the breakdown terms use only local variables.
- Keywords
- turbomachinery flows, laminar-to-turbulent transition, separation-induced transition, bypass transition, algebraic transition model, DIRECT NUMERICAL SIMULATIONS, BOUNDARY-LAYER, BYPASS TRANSITION, LOCAL VARIABLES, BUBBLES, CASCADE
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Citation
Please use this url to cite or link to this publication: http://hdl.handle.net/1854/LU-8679437
- MLA
- Kubacki, Slawomir, et al. “An Extended Version of an Algebraic Intermittency Model for Prediction of Separation-Induced Transition at Elevated Free-Stream Turbulence Level.” INTERNATIONAL JOURNAL OF TURBOMACHINERY, PROPULSION AND POWER, vol. 5, no. 4, 2020, doi:10.3390/ijtpp5040028.
- APA
- Kubacki, S., Simoni, D., Lengani, D., & Dick, E. (2020). An extended version of an algebraic intermittency model for prediction of separation-induced transition at elevated free-stream turbulence level. INTERNATIONAL JOURNAL OF TURBOMACHINERY, PROPULSION AND POWER, 5(4). https://doi.org/10.3390/ijtpp5040028
- Chicago author-date
- Kubacki, Slawomir, Daniele Simoni, Davide Lengani, and Erik Dick. 2020. “An Extended Version of an Algebraic Intermittency Model for Prediction of Separation-Induced Transition at Elevated Free-Stream Turbulence Level.” INTERNATIONAL JOURNAL OF TURBOMACHINERY, PROPULSION AND POWER 5 (4). https://doi.org/10.3390/ijtpp5040028.
- Chicago author-date (all authors)
- Kubacki, Slawomir, Daniele Simoni, Davide Lengani, and Erik Dick. 2020. “An Extended Version of an Algebraic Intermittency Model for Prediction of Separation-Induced Transition at Elevated Free-Stream Turbulence Level.” INTERNATIONAL JOURNAL OF TURBOMACHINERY, PROPULSION AND POWER 5 (4). doi:10.3390/ijtpp5040028.
- Vancouver
- 1.Kubacki S, Simoni D, Lengani D, Dick E. An extended version of an algebraic intermittency model for prediction of separation-induced transition at elevated free-stream turbulence level. INTERNATIONAL JOURNAL OF TURBOMACHINERY, PROPULSION AND POWER. 2020;5(4).
- IEEE
- [1]S. Kubacki, D. Simoni, D. Lengani, and E. Dick, “An extended version of an algebraic intermittency model for prediction of separation-induced transition at elevated free-stream turbulence level,” INTERNATIONAL JOURNAL OF TURBOMACHINERY, PROPULSION AND POWER, vol. 5, no. 4, 2020.
@article{8679437, abstract = {{An algebraic intermittency model for boundary layer flow transition from laminar to turbulent state, is extended using an experimental data base on boundary layer flows with various transition types and results by large eddy simulation of transition in a separated boundary layer. The originating algebraic transition model functions well for bypass transition in an attached boundary layer under a moderately high or elevated free-stream turbulence level, and for transition by Kelvin–Helmholtz instability in a separated boundary layer under a low free-stream turbulence level. It also functions well for transition in a separated layer, caused by a very strong adverse pressure gradient under a moderately high or elevated free-stream turbulence level. It is not accurate for transition in a separated layer under a moderately strong adverse pressure gradient, in the presence of a moderately high or elevated free-stream turbulence level. The extension repairs this deficiency. Therefore, a sensor function for detection of the front part of a separated boundary layer activates two terms that express the effect of free-stream turbulence on the breakdown of a separated layer, without changing the functioning of the model in other flow regions. The sensor and the breakdown terms use only local variables.}}, articleno = {{28}}, author = {{Kubacki, Slawomir and Simoni, Daniele and Lengani, Davide and Dick, Erik}}, issn = {{2504-186X}}, journal = {{INTERNATIONAL JOURNAL OF TURBOMACHINERY, PROPULSION AND POWER}}, keywords = {{turbomachinery flows,laminar-to-turbulent transition,separation-induced transition,bypass transition,algebraic transition model,DIRECT NUMERICAL SIMULATIONS,BOUNDARY-LAYER,BYPASS TRANSITION,LOCAL VARIABLES,BUBBLES,CASCADE}}, language = {{eng}}, number = {{4}}, pages = {{24}}, title = {{An extended version of an algebraic intermittency model for prediction of separation-induced transition at elevated free-stream turbulence level}}, url = {{http://doi.org/10.3390/ijtpp5040028}}, volume = {{5}}, year = {{2020}}, }
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