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dc.contributor.authorLi, Huajun
dc.contributor.authorYang, Zhiyin
dc.date.accessioned2019-10-25T10:14:21Z
dc.date.available2019-10-25T10:14:21Z
dc.date.issued2019-10-14
dc.identifier.citationLi, H.J. and Yang, Z., (2019). 'Separated boundary layer transition under pressure gradient in the presence of free-stream turbulence'. Physics of Fluids, 31(10), pp, 1-14. DOI: 10.1063/1.5122889.en_US
dc.identifier.issn10706631
dc.identifier.doi10.1063/1.5122889
dc.identifier.urihttp://hdl.handle.net/10545/624251
dc.description.abstractLarge-eddy simulation (LES) has been carried out to investigate the transition process of a separated boundary layer on a flat plate. A streamwise pressure distribution is imposed to mimic the suction surface of a low-pressure turbine blade, and the free-stream turbulence intensity at the plate leading edge is 2.9%. A dynamic subgrid 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 thoroughly analyzed, and streamwise streaky structures, known as the Klebanoff streaks, have been observed much further upstream of the separation. However, transition occurs in the separated shear layer and is caused by two mechanisms: streamwise streaks and the inviscid K-H instability. Analysis suggests that streamwise streaks play a dominant role in the transition process as those streaks severely disrupt and break up the K-H rolls once they are formed, leading to significant three-dimensional (3D) motions very rapidly. It is also demonstrated in the present study that the usual secondary instability stage under low free-stream turbulence intensity where coherent two-dimensional (2D) spanwise rolls get distorted gradually and eventually broken up into 3D structures has been bypassed.en_US
dc.description.sponsorshipN/Aen_US
dc.language.isoenen_US
dc.publisherAIP Publishingen_US
dc.relation.urlhttps://doi.org/10.1063/1.5122889en_US
dc.relation.urlhttps://aip.scitation.org/doi/pdf/10.1063/1.5122889?class=pdfen_US
dc.subjectSeparated boundary layer transitionen_US
dc.subjectinstabilityen_US
dc.subjectLarge-eddy simulationen_US
dc.subjectfree-stream turbulenceen_US
dc.titleSeparated boundary layer transition under pressure gradient in the presence of free-stream turbulenceen_US
dc.typeArticleen_US
dc.identifier.eissn10897666
dc.contributor.departmentUniversity of Derbyen_US
dc.contributor.departmentUniversity of Sussexen_US
dc.identifier.journalPhysics of Fluidsen_US
dc.source.volume31
dc.source.issue10
dc.source.beginpage104106
dcterms.dateAccepted2019-09-26
refterms.dateFOA2019-10-25T10:14:22Z
dc.author.detail784574en_US


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