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Negative streamwise velocities and other rare events near the wall in turbulent flows
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-9819-2906
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0001-9627-5903
Show others and affiliations
2011 (English)In: 13th European Turbulence Conference (ETC13): Wall-Bounded Flows And Control Of Turbulence, Institute of Physics Publishing (IOPP), 2011, 022013- p.Conference paper, Published paper (Refereed)
Abstract [en]

Negative streamwise velocities, extreme wall-normal velocites and high flatness values for the wall-normal fluctuations near the wall are investigated for turbulent channel flow simulations at a series of Reynolds numbers up to Reτ = 1000 in this paper. Probability density functions of the wall-shear stress and velocity components are presented, as well as joint probability density functions of the velocity components and the pressure. Backflow occurs more often (0.06% at Reτ = 1000) and further away from the wall into the buffer layer for rising Reynolds number. An oblique vortex outside the viscous sublayer is found to cause this backflow. Extreme v events occur also more often for rising Rey nolds number. Positive and negative velocity spikes appear in pairs, located on the two edges of a strong streamwise vortex: the negative spike occurring in a high speed streak indicating a sweeping motion, while the positive spike is located between a high and low speed streak. These extreme v events cause high flatness values near the wall (F(v) = 43 at Reτ = 1000).

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2011. 022013- p.
Series
Journal of Physics: Conference Series (Print), ISSN 1742-6588 ; 318
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-41273DOI: 10.1088/1742-6596/318/2/022013ISI: 000301292300013Scopus ID: 2-s2.0-84863011882OAI: oai:DiVA.org:kth-41273DiVA: diva2:443496
Conference
13th European Turbulence Conference (ETC) Location: Univ Warsaw, Warsaw, Poland, Date: SEP 12-15, 2011
Note
QC 20110926Available from: 2011-09-26 Created: 2011-09-26 Last updated: 2012-04-10Bibliographically 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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Brethouwer, GeertSchlatter, PhilippÖrlü, Ramis

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