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Swirl switching in turbulent flow through 90 degrees pipe bends

Carlsson, Christian LU ; Alenius, Emma LU and Fuchs, Laszlo LU (2015) In Physics of Fluids 27(8).
Abstract
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. (C) 2015 Author(s). All article content, except where otherwise noted,... (More)
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. (C) 2015 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physics of Fluids
volume
27
issue
8
publisher
American Institute of Physics
external identifiers
  • wos:000360646600042
  • scopus:84940399376
ISSN
1070-6631
DOI
10.1063/1.4928971
language
English
LU publication?
yes
id
fdad2225-f760-4bd7-b0f2-b14c5a222532 (old id 8080536)
date added to LUP
2015-10-20 11:25:01
date last changed
2017-11-19 03:20:40
@article{fdad2225-f760-4bd7-b0f2-b14c5a222532,
  abstract     = {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. (C) 2015 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.},
  articleno    = {085112},
  author       = {Carlsson, Christian and Alenius, Emma and Fuchs, Laszlo},
  issn         = {1070-6631},
  language     = {eng},
  number       = {8},
  publisher    = {American Institute of Physics},
  series       = {Physics of Fluids},
  title        = {Swirl switching in turbulent flow through 90 degrees pipe bends},
  url          = {http://dx.doi.org/10.1063/1.4928971},
  volume       = {27},
  year         = {2015},
}