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Flow features in three-dimensional turbulent duct flows with different aspect ratios
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0001-6570-5499
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0001-9627-5903
2016 (English)In: Springer Proceedings in Physics, Springer, 2016, 123-126 p.Conference paper (Refereed)
Abstract [en]

Direct numerical simulations of turbulent duct flows with width-to-height ratios 1, 3, 5, 7 and 10, at a friction Reynolds number Reτ,c ≃ 180, are carried out with the spectral element code Nek5000. The aim of these simulations is to gain insight into the kinematics and dynamics of Prandtl’s secondary flow of second kind, and its impact on the flow physics of wall-bounded turbulence. The secondary flow is characterized in terms of the cross-plane mean kinetic energy K = (V2 + W2)/2, and its variation in the spanwise direction of the flow. Our results show that averaging times of at least 3, 000 time units are required to reach a converged state of the secondary flow, which extends up to z* ≃ 5 h from the side walls. We also show that if the duct is not wide enough to accommodate the whole extent of the secondary flow, then its structure is modified by means of a different spanwise distribution of energy. Future proposed work includes coherent structure eduction, quadrant analysis at the corner, and comparisons with spanwise-periodic channels at comparable Reynolds numbers. © Springer International Publishing Switzerland 2016.

Place, publisher, year, edition, pages
Springer, 2016. 123-126 p.
National Category
Mechanical Engineering
URN: urn:nbn:se:kth:diva-194582DOI: 10.1007/978-3-319-29130-7_22ScopusID: 2-s2.0-84966783299ISBN: 9783319291291OAI: diva2:1044182
6th International Conference on Progress in Turbulence, iTi 2014, 29 August 2014 through 29 August 2014

Correspondence Address: Vinuesa, R.; Linné FLOW Centre, KTH Mechanics, Osquars Backe 18, Sweden; email: QC 20161102

Available from: 2016-11-02 Created: 2016-10-31 Last updated: 2016-11-02Bibliographically approved

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