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Flow structures in zero pressure-gradient turbulent boundary layers
KTH, School of Engineering Sciences (SCI), Mechanics.
KTH, School of Engineering Sciences (SCI), Mechanics.
KTH, School of Engineering Sciences (SCI), Mechanics, Turbulence.ORCID iD: 0000-0002-2711-4687
2003 (English)In: European journal of mechanics. B, Fluids, ISSN 0997-7546, E-ISSN 1873-7390, Vol. 22, no 4, 379-390 p.Article in journal (Refereed) Published
Abstract [en]

The near-wall region of zero-pressure gradient turbulent boundary layers was studied through correlation- and other two- point measurements over a wide range of Reynolds numbers. The requirements of high spatial resolution were met by use of a MEMS-type of hot-film sensor array together with a small, in-house built hot-wire probe. Streak-spacing and characteristics of buffer region shear-layer events were studied. At high Reynolds numbers the motions that are of substantially larger scale than the streaks have a significant influence on the near-wall dynamics. By removing such scales through high-pass filtering a streak spacing was recovered that is close to that found in low Reynolds number flows. The frequency of occurrence of shear- layer events was found to scale with a mixed time scale, in analogy with earlier findings in channel flow, again indicating the increasing relative influence of large scales with increasing Reynolds number.

Place, publisher, year, edition, pages
Elsevier, 2003. Vol. 22, no 4, 379-390 p.
National Category
Fluid Mechanics and Acoustics
Research subject
Engineering Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-147772OAI: oai:DiVA.org:kth-147772DiVA: diva2:732088
Note
NR 20140805Available from: 2014-07-03 Created: 2014-07-03 Last updated: 2017-12-05Bibliographically approved

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