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Characterization of turbulent coherent structures in square duct flow
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, Centres, SeRC - Swedish e-Science Research Centre. 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: 0000-0001-6570-5499
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, Centres, SeRC - Swedish e-Science Research Centre. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.
2018 (English)In: Journal of Physics: Conference Series, Institute of Physics Publishing (IOPP), 2018, Vol. 1001, no 1Conference paper, Published paper (Refereed)
Abstract [en]

This work is aimed at a first characterization of coherent structures in turbulent square duct flows. Coherent structures are defined as connected components in the domain identified as places where a quantity of interest (such as Reynolds stress or vorticity) is larger than a prescribed non-uniform threshold. Firstly, we qualitatively discuss how a percolation analysis can be used to assess the effectiveness of the threshold function, and how it can be affected by statistical uncertainty. Secondly, various physical quantities that are expected to play an important role in the dynamics of the secondary flow of Prandtl's second kind are studied. Furthermore, a characterization of intense Reynolds-stress events in square duct flow, together with a comparison of their shape for analogous events in channel flow at the same Reynolds number, is presented.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2018. Vol. 1001, no 1
Series
Journal of Physics: Conference Series, ISSN 1742-6588 ; 1001
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-238245DOI: 10.1088/1742-6596/1001/1/012008ISI: 000454926900008Scopus ID: 2-s2.0-85046084236OAI: oai:DiVA.org:kth-238245DiVA, id: diva2:1263768
Conference
3rd Madrid Summer School on Turbulence, School of Aeronautics of the Universidad Politecnica de MadridMadrid, Spain, 29 May 2017 through 30 June 2017
Funder
EU, European Research CouncilSwedish Research CouncilSwedish Foundation for Strategic Research , BD15-0082Knut and Alice Wallenberg Foundation, BD15-0082Swedish e‐Science Research Center
Note

QC 20181116

Available from: 2018-11-16 Created: 2018-11-16 Last updated: 2019-01-18Bibliographically approved

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