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Characterization of turbulent coherent structures in square duct flow
KTH, Skolan för teknikvetenskap (SCI), Mekanik. KTH, Centra, SeRC - Swedish e-Science Research Centre. KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW.
KTH, Skolan för teknikvetenskap (SCI), Mekanik. KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW. KTH, Centra, SeRC - Swedish e-Science Research Centre.ORCID-id: 0000-0001-6570-5499
KTH, Skolan för teknikvetenskap (SCI), Mekanik. KTH, Centra, SeRC - Swedish e-Science Research Centre. KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW.
2018 (engelsk)Inngår i: Journal of Physics: Conference Series, Institute of Physics Publishing (IOPP), 2018, Vol. 1001, nr 1Konferansepaper, Publicerat paper (Fagfellevurdert)
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.

sted, utgiver, år, opplag, sider
Institute of Physics Publishing (IOPP), 2018. Vol. 1001, nr 1
Serie
Journal of Physics: Conference Series, ISSN 1742-6588 ; 1001
HSV kategori
Identifikatorer
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
Konferanse
3rd Madrid Summer School on Turbulence, School of Aeronautics of the Universidad Politecnica de MadridMadrid, Spain, 29 May 2017 through 30 June 2017
Forskningsfinansiär
EU, European Research CouncilSwedish Research CouncilSwedish Foundation for Strategic Research , BD15-0082Knut and Alice Wallenberg Foundation, BD15-0082Swedish e‐Science Research Center
Merknad

QC 20181116

Tilgjengelig fra: 2018-11-16 Laget: 2018-11-16 Sist oppdatert: 2019-01-18bibliografisk kontrollert

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