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Large-Eddy BreakUp Devices - a 40 Years Perspective from a Stockholm Horizon
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH Mech, Linne FLOW Ctr, SE-10044 Stockholm, Sweden..ORCID iD: 0000-0002-1146-3241
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-1663-3553
2018 (English)In: Flow Turbulence and Combustion, ISSN 1386-6184, E-ISSN 1573-1987, Vol. 100, no 4, p. 877-888Article in journal (Refereed) Published
Abstract [en]

In the beginning of the 1980's Large Eddy BreakUp (LEBU) devices, thin plates or airfoils mounted in the outer part of turbulent boundary layers, were shown to be able to change the turbulent structure and intermittency as well as reduce turbulent skin friction. In some wind-tunnel studies it was also claimed that a net drag reduction was obtained, i.e. the reduction in skin-friction drag was larger than the drag on the devices. However, towing-tank experiments with a flat plate at high Reynolds numbers as well as with an axisymmetric body showed no net reduction, but instead an increase in total drag. Recent large-eddy simulations have explored the effect of LEBUs on the turbulent boundary layer and evaluations of the total drag show similar results as in the towing tank experiments. Despite these negative results in terms of net drag reduction, LEBUs manipulate the boundary layer in an interesting way which explains why they still attract some interest. The reason for the positive results in the wind-tunnel studies as compared to drag measurements are discussed here, although no definite answer for the differences can be given.

Place, publisher, year, edition, pages
Springer, 2018. Vol. 100, no 4, p. 877-888
Keywords [en]
Turbulence, Drag reduction, Drag measurement, Skin friction, Momentum-loss calculation
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-230479DOI: 10.1007/s10494-018-9908-4ISI: 000433113900002Scopus ID: 2-s2.0-85047490005OAI: oai:DiVA.org:kth-230479DiVA, id: diva2:1217731
Conference
European Drag Reduction and Flow Control Meeting (EDRFCM), APR 03-06, 2017, Monte Porzio Catone, Italy
Note

QC 20180613

Available from: 2018-06-13 Created: 2018-06-13 Last updated: 2018-06-13Bibliographically approved

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Alfredsson, P. HenrikÖrlü, Ramis

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