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dc.contributor.authorChin, C.en
dc.contributor.authorÖrlü, R.en
dc.contributor.authorMonty, J.en
dc.contributor.authorHutchins, N.en
dc.contributor.authorOoi, A.en
dc.contributor.authorSchlatter, P.en
dc.identifier.citationFlow, Turbulence and Combustion, 2017; 98(2):445-460en
dc.descriptionPublished online: 11 August 2016en
dc.description.abstractA well-resolved large eddy simulation (LES) of a large-eddy break-up (LEBU) device in a spatially evolving turbulent boundary layer is performed with, Reynolds number, based on free-stream velocity and momentum-loss thickness, of R e θ ≈ 4300. The implementation of the LEBU is via an immersed boundary method. The LEBU is positioned at a wall-normal distance of 0.8 δ (δ denoting the local boundary layer thickness at the location of the LEBU) from the wall. The LEBU acts to delay the growth of the turbulent boundary layer and produces global skin friction reduction beyond 180δ downstream of the LEBU, with a peak local skin friction reduction of approximately 12 %. However, no net drag reduction is found when accounting for the device drag of the LEBU in accordance with the towing tank experiments by Sahlin et al. (Phys. Fluids 31, 2814, 1988). Further investigation is performed on the interactions of high and low momentum bulges with the LEBU and the corresponding output is analysed, showing a ‘break-up’ of these large momentum bulges downstream of the LEBU. In addition, results from the spanwise energy spectra show consistent reduction in energy at spanwise length scales for λ+z>1000 independent of streamwise and wall-normal location when compared to the corresponding turbulent boundary layer without LEBU.en
dc.description.statementofresponsibilityCheng Chin, Ramis Örlü, Jason Monty, Nicholas Hutchins, Andrew Ooi, Philipp Schlatteren
dc.publisherSpringer Netherlandsen
dc.rights© Springer Science+Business Media Dordrecht 2016en
dc.subjectBoundary layer; Large eddy simulation; wall turbulence; Large-eddy-break-up device; drag reductionen
dc.titleSimulation of a Large-Eddy-Break-up Device (LEBU) in a moderate Reynolds number turbulent boundary layeren
dc.typeJournal articleen
pubs.library.collectionMechanical Engineering publicationsen
dc.identifier.orcidChin, C. [0000-0002-2709-4321]en
Appears in Collections:Mechanical Engineering publications

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