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Large-scale and small-scale contribution to the skin friction reduction in a modified turbulent boundary layer by a large-eddy break-up device
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, School of Engineering Sciences (SCI), Engineering Mechanics, Fluid Mechanics and Engineering Acoustics.ORCID iD: 0000-0002-1663-3553
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, School of Engineering Sciences (SCI), Engineering Mechanics, Fluid Mechanics and Engineering Acoustics.ORCID iD: 0000-0001-9627-5903
Univ Adelaide, Sch Mech Engn, Adelaide, SA 5005, Australia..
2022 (English)In: Physical Review Fluids, E-ISSN 2469-990X, Vol. 7, no 3, article id 034601Article in journal (Refereed) Published
Abstract [en]

The role of streamwise length scales (lambda x) in turbulent skin friction generation is investigated using a direct numerical simulation data set of an incompressible zero pressure gradient turbulent boundary layer and the spectral analysis based on the FukagataL73 (2002)]. The total skin friction generation associated with motions scaled with local boundary layer thickness delta of lambda x 3 delta and lambda x 3 delta) contribute to a significant portion of turbulent skin friction. However, it is found that the large-scale ejection and sweep events with streamwise length scales at lambda x 3 delta are equally important. The turbulent skin friction reduction associated with the modification of largeand small-scale quadrant events is studied, using well-resolved simulation data sets of a large-eddy break-up (LEBU) device in a turbulent boundary layer. The results reveal that LEBUs modify both the large- and small-scale ejection and sweep events, yielding a substantial turbulent skin friction reduction.

Place, publisher, year, edition, pages
American Physical Society (APS) , 2022. Vol. 7, no 3, article id 034601
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-310766DOI: 10.1103/PhysRevFluids.7.034601ISI: 000772738300005Scopus ID: 2-s2.0-85127146525OAI: oai:DiVA.org:kth-310766DiVA, id: diva2:1650510
Note

QC 20220407

Available from: 2022-04-07 Created: 2022-04-07 Last updated: 2022-06-25Bibliographically approved

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Örlü, RamisSchlatter, Philipp

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