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On the vortical structures of a turbulent boundary layer at high Reynolds number
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0001-9627-5903
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.
2011 (English)Report (Other academic)
Abstract [en]

A recent data base from direct numerical simulation of a turbulent boundary layer up to Reθ = 4300 [Schlatter & Örlü, J. Fluid Mech. 659, 2010] has been analysed in an effort to educe the dominant flow structures populating the near-wall region. In particular, the question of whether hairpin vortices are indeed observable as a dominant building block of near-wall turbulence is addressed. It is shown that during the initial phase, dominanted by the specific laminar-turbulent transition induced via the tripping mechanism, hairpin vortices are very numerous, and can certainly be considered as the dominant structure. This is in agreement with previous experiments and low Reynolds number simulations such as Wu & Moin [J. Fluid Mech. 630, 2009]. At sufficient distance from transition, the flow is dominated by a staggered array of quasi-streamwise vortices which is the same situation as in previous channel flows. It turns out that even quantitatively, no major differences between boundary layers and channels can be detected; structures are about 200 viscous units in length, and inclined by about 9 degrees [Jeong et al., J. Fluid Mech. 332, 1997]. The present results clearly show that the regeneration process of turbulence does not involve the generation of (symmetric) hairpin vortices, and that their dominant appearance as instantaneous flow structures in the outer boundary-layer region is at least very unlikely.

Place, publisher, year, edition, pages
2011.
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-41274OAI: oai:DiVA.org:kth-41274DiVA: diva2:443509
Funder
Swedish e‐Science Research Center
Note
QC 20110926Available from: 2011-09-26 Created: 2011-09-26 Last updated: 2011-09-26Bibliographically approved
In thesis
1. Direct and Large-Eddy Simulations of Turbulent  Boundary Layers with Heat Transfer
Open this publication in new window or tab >>Direct and Large-Eddy Simulations of Turbulent  Boundary Layers with Heat Transfer
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2011. xv, 83 p.
Series
Trita-MEK, ISSN 0348-467X ; 2011:11
Keyword
direct numerical simulation (DNS), large-eddy simulation (LES), turbulent boundary layer, passive scalar, coherent structures, free-stream t urbulence (FST), structure ensemble dynamics (SED), massively parallel simulations
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-41156 (URN)978-91-7501-101-1 (ISBN)
Public defence
2011-10-10, F3 Sal, Lindstedsv. 26, KTH, Stockholm, 10:15 (English)
Opponent
Supervisors
Funder
Swedish e‐Science Research Center
Note
QC 20110926Available from: 2011-09-26 Created: 2011-09-23 Last updated: 2012-05-24Bibliographically approved

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Schlatter, PhilippHenningson, Dan S.

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