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Scaling of small-scale motions in wall-bounded turbulent flows
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, Centres, SeRC - Swedish e-Science Research Centre.ORCID iD: 0000-0002-9819-2906
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, Centres, SeRC - Swedish e-Science Research Centre. KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0001-9627-5903
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2013 (English)In: International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013, TSFP-8 , 2013Conference paper, Published paper (Refereed)
Abstract [en]

The objective is to investigate flow topology and related Reynolds-number scaling in the eigenframe of the strain-rate tensor for wall-bounded turbulent flows. The databases used in the current study are from direct numerical simulations (DNS) of fully developed channel flow up to friction Reynolds number Ret ≈ 1500, and a spatially developing, zero-pressure-gradient turbulent boundary layer up to Reθ ≈ 4300 (Ret ≈ 1400)., and a spatially developing, zero-pressure-gradient turbulent boundary layer up to Reθ ≈ 4300 (Ret ≈ 1400).. It is found that for all cases considered, the averaged flow patterns in the local strainrate eigenframe appear universal: large scale motions are separated by a shear layer with a pair of vortices. Based on Kolmogorov (η,uη), Taylor (lt) and integral length scales, Reynolds-number scalings of the averaged flow patterns, including the thickness and strength of the shear layer, the distance between the two vortical regions, and the velocity distribution along the most compressing and stretching directions are considered. It is found that the Taylor scaling of the profiles for the thickness of the shear layer seems more suitable than the Kolmogorov scaling, and the integral scaling collapses well away from the shear layer, which confirms that those patterns represent large scales. Generally speaking, the scaling profiles based on the Kolmogorov length and velocity collapse well near the origin, but the Taylor scaling seems best suited in a broader region.

Place, publisher, year, edition, pages
TSFP-8 , 2013.
Keywords [en]
Atmospheric thermodynamics, Boundary layer flow, Boundary layers, Flow patterns, Pressure gradient, Reynolds number, Strain rate, Turbulence, Turbulent flow, Flow topology, Kolmogorov lengths, Kolmogorov scaling, Large scale motion, Strain rate tensors, Stretching direction, Wall-bounded turbulent flows, Zero-pressure gradient turbulent boundary layer, Shear flow
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-222977Scopus ID: 2-s2.0-85034261649ISBN: 9780000000002 OAI: oai:DiVA.org:kth-222977DiVA, id: diva2:1193273
Conference
8th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013, 28 August 2013 through 30 August 2013
Note

QC 20180326

Available from: 2018-03-26 Created: 2018-03-26 Last updated: 2018-05-24Bibliographically approved

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Brethouwer, GertSchlatter, PhilippJohansson, Arne V.

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Wei, LiangBrethouwer, GertSchlatter, PhilippJohansson, Arne V.
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Linné Flow Center, FLOWMechanicsSeRC - Swedish e-Science Research CentreTurbulence
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