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A new scaling for the streamwise turbulence intensity in wall-bounded turbulent flows and what it tells us about the "outer" peak
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0002-1146-3241
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0001-8667-0520
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0002-1663-3553
2011 (English)In: Physics of fluids, ISSN 1070-6631, E-ISSN 1089-7666, Vol. 23, no 4, 041702- p.Article in journal (Refereed) Published
Abstract [en]

One recent focus of experimental studies of turbulence in high Reynolds number wall-bounded flows has been the scaling of the root mean square of the fluctuating streamwise velocity, but progress has largely been impaired by spatial resolution effects of hot-wire sensors. For the near-wall peak, recent results seem to have clarified the controversy; however, one of the remaining issues in this respect is the emergence of a second (so-called outer) peak at high Reynolds numbers. The present letter introduces a new scaling of the local turbulence intensity profile, based on the diagnostic plot by Alfredsson and Orlu [Eur. J. Mech. B/Fluids 42, 403 (2010)], which predicts the location and amplitude of the "outer" peak and suggests its presence as a question of sufficiently large scale separation.

Place, publisher, year, edition, pages
2011. Vol. 23, no 4, 041702- p.
Keyword [en]
LAYERS
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-33696DOI: 10.1063/1.3581074ISI: 000290050000003Scopus ID: 2-s2.0-79955435584OAI: oai:DiVA.org:kth-33696DiVA: diva2:418580
Funder
Swedish Research Council
Note
QC 20110523Available from: 2011-05-23 Created: 2011-05-16 Last updated: 2017-12-11Bibliographically approved

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Alfredsson, P. HenrikSegalini, AntonioÖrlü, Ramis

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