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dc.contributor.authorLi, Huajun
dc.contributor.authorYang, Zhiyin
dc.date.accessioned2016-10-17T13:17:30Z
dc.date.available2016-10-17T13:17:30Z
dc.date.issued2016-07-13
dc.identifier.citationLi. H., Yang, Z. 'Numerical study of separated boundary layer transition under pressure gradient', Proceeding of the 12th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, 11-13 July 2016, Malaga, Spain.en
dc.identifier.urihttp://hdl.handle.net/10545/620617
dc.description.abstractLarge-eddy simulation (LES) is conducted to study the transition process of a separated boundary layer on a flat plate with an elliptical leading edge. A streamwise pressure distribution is imposed and the free stream turbulence intensity is 3% to mimic the suction surface of a low-pressure turbine (LPT) blade. A dynamic sub-grid scale model is employed in the study and the current LES results compare well with available experimental data and previous LES results. The transition process has been analysed with a particular focus on primary instabilities at work. Streaky structures further upstream of the separation, known as the Klebanoff Streaks, have been observed. Typical two-dimensional Kelvin-Helmholtz (K-H) rolls are distorted in the separated region. When Klebanoff streaks passing over a full-span K-H roll, portion of the two-dimensional roll merges with the Klebanoff streaks and develop into chaotic three-dimensional structures, whereas the remaining undisrupted two-dimensional K-H rolls develop into Λ-vortex indicating that despite the disturbances before separation, the K-H instability may still be the main instability at work.
dc.language.isoenen
dc.relation.urlhttps://edas.info/web/hefat2016/en
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectSeparated boundary layeren
dc.subjectTransitionen
dc.titleNumerical study of separated boundary layer transition under pressure gradienten
dc.typeArticleen
dc.contributor.departmentUniversity of Sussex, Brighton, UKen
dc.contributor.departmentUniversity of Derby, Derby, UKen
dc.identifier.journalProceeding of the 12th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, 11-13 July 2016, Malaga, Spain.en
dc.internal.reviewer-notePreprint but no mention of which journal this is a preprint for.en
refterms.dateFOA2019-02-28T14:44:21Z
html.description.abstractLarge-eddy simulation (LES) is conducted to study the transition process of a separated boundary layer on a flat plate with an elliptical leading edge. A streamwise pressure distribution is imposed and the free stream turbulence intensity is 3% to mimic the suction surface of a low-pressure turbine (LPT) blade. A dynamic sub-grid scale model is employed in the study and the current LES results compare well with available experimental data and previous LES results. The transition process has been analysed with a particular focus on primary instabilities at work. Streaky structures further upstream of the separation, known as the Klebanoff Streaks, have been observed. Typical two-dimensional Kelvin-Helmholtz (K-H) rolls are distorted in the separated region. When Klebanoff streaks passing over a full-span K-H roll, portion of the two-dimensional roll merges with the Klebanoff streaks and develop into chaotic three-dimensional structures, whereas the remaining undisrupted two-dimensional K-H rolls develop into Λ-vortex indicating that despite the disturbances before separation, the K-H instability may still be the main instability at work.


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