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Swirl switching in turbulent flow through 90 degrees pipe bends
Division of Fluid Mechanics, Department of Energy Sciences, Lund University, Sweden.
Division of Fluid Mechanics, Department of Energy Sciences, Lund University, Sweden.ORCID iD: 0000-0002-4156-8976
KTH, School of Engineering Sciences (SCI), Mechanics. Lund University, Sweden.
2015 (English)In: Physics of fluids, ISSN 1070-6631, E-ISSN 1089-7666, Vol. 27, no 8, 085112Article in journal (Refereed) Published
Abstract [en]

Turbulent flow through 90 degrees pipe bends, for four different curvatures, has been investigated using large eddy simulations. In particular, the origin of the so-called swirl switching phenomenon, which is a large scale oscillation of the flow after the bend, has been studied for different bend curvature ratios. A classification of the phenomenon into a high and a low frequency switching, with two distinct physical origins, is proposed. While the high frequency switching stems from modes formed at the bend, and becomes increasingly important for sharp curvatures, the low frequency switching originates from very-large-scale motions created in the upstream pipe flow.

Place, publisher, year, edition, pages
2015. Vol. 27, no 8, 085112
National Category
Fluid Mechanics and Acoustics
URN: urn:nbn:se:kth:diva-173986DOI: 10.1063/1.4928971ISI: 000360646600042ScopusID: 2-s2.0-84940399376OAI: diva2:858811
Swedish Research CouncilSwedish National Infrastructure for Computing (SNIC)

QC 20151005

Available from: 2015-10-05 Created: 2015-09-24 Last updated: 2016-09-20Bibliographically approved

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