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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, 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.
2018 (English)In: Physical Review Fluids, E-ISSN 2469-990X, Vol. 3, no 7, article id 072602Article in journal (Refereed) 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.

Place, publisher, year, edition, pages
American Physical Society, 2018. Vol. 3, no 7, article id 072602
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-232605DOI: 10.1103/PhysRevFluids.3.072602ISI: 000438353500001OAI: oai:DiVA.org:kth-232605DiVA, id: diva2:1236145
Funder
Swedish Research CouncilSwedish e‐Science Research Center
Note

QC 20180731

Available from: 2018-07-31 Created: 2018-07-31 Last updated: 2019-04-04Bibliographically approved

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