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Transitional and turbulent bent pipes
KTH, School of Engineering Sciences (SCI), Mechanics, Stability, Transition and Control. 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, School of Engineering Sciences (SCI), Mechanics, Stability, Transition and Control. 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.
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2017 (English)In: Progress in Turbulence VII, Springer Science+Business Media B.V., 2017, Vol. 196, p. 81-87Conference paper (Refereed)
Abstract [en]

We review a number of aspects of the transitional and turbulent flow in bent pipes, obtained at KTH using the spectral-element code Nek5000. This flow, sometimes also called Dean flow, is characterised by the appearance of Dean vortices, which arise due to the action of the centrifugal force in the bend. We start with reviewing recent stability analysis in the toroidal flow, and conclude that for all curvatures δ>0 an exponential instability is present at a bulk Reynolds number of about 4000. Further increasing the Reynolds number lets the flow go through a region with potential sub straight and sublaminar drag. An analysis using proper orthogonal decomposition (POD) reveals that wave-like motions are still present in the otherwise turbulent flow. Upon further increasing Re, the in-plane Dean vortices lead to a modulation of turbulence depending on the azimuthal position. The flow is then dominated by low-frequency so-called swirl-switching motion. This motion is studied in both a periodic and spatially developing framework. Finally, the effect of Dean vortices on Lagrangian inertial particles is studied.

Place, publisher, year, edition, pages
Springer Science+Business Media B.V., 2017. Vol. 196, p. 81-87
Series
Springer Proceedings in Physics, ISSN 0930-8989 ; 196
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-212035DOI: 10.1007/978-3-319-57934-4_12Scopus ID: 2-s2.0-85022344365ISBN: 9783319579337 OAI: oai:DiVA.org:kth-212035DiVA, id: diva2:1133377
Conference
7th iTi Conference on Turbulence, 2016, Bertinoro, Italy, 7 September 2016 through 9 September 2016
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation
Note

QC 20170815

Available from: 2017-08-15 Created: 2017-08-15 Last updated: 2017-08-15Bibliographically approved

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