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Vorticity fluxes and secondary flow: Relevance for turbulence modeling
IIT, MMAE Dept, Chicago, IL 60616 USA..
IIT, MMAE Dept, Chicago, IL 60616 USA..
KTH, Skolan för teknikvetenskap (SCI), Mekanik. KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW. KTH, Centra, SeRC - Swedish e-Science Research Centre.
2018 (engelsk)Inngår i: Physical Review Fluids, E-ISSN 2469-990X, Vol. 3, nr 7, artikkel-id 072602Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Vorticity fluxes are analyzed in fully developed turbulent flow through rectangular ducts with a width-to-height ratio of 3, and both straight and semicylindrical side walls, at a centerplane friction Reynolds number Re-tau,(c) similar or equal to 180. The transport of secondary Reynolds stresses by the secondary flow of Prandtl's second kind is analyzed from a vorticity-flux perspective. This analysis reveals that the in-plane transport of viscous stresses locally counteracts the inhomogeneous distribution of the turbulent shear-stress gradient in the spanwise direction. A relationship is established between the mean and fluctuating transport terms that can be useful to improve turbulence models and their ability to accurately predict the secondary flow. Finally, quadrant analysis is used to evaluate the contribution from the different types of bursting events to the fluctuating transport terms.

sted, utgiver, år, opplag, sider
American Physical Society, 2018. Vol. 3, nr 7, artikkel-id 072602
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-232605DOI: 10.1103/PhysRevFluids.3.072602ISI: 000438353500001OAI: oai:DiVA.org:kth-232605DiVA, id: diva2:1236145
Forskningsfinansiär
Swedish Research CouncilSwedish e‐Science Research Center
Merknad

QC 20180731

Tilgjengelig fra: 2018-07-31 Laget: 2018-07-31 Sist oppdatert: 2019-04-04bibliografisk kontrollert

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