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Swirl-switching phenomenon in turbulent flow through toroidal pipes
KTH, School of Engineering Sciences (SCI), Mechanics, Stability, Transition and Control.
KTH, School of Engineering Sciences (SCI), Mechanics, Stability, Transition and Control.ORCID iD: 0000-0001-9627-5903
2016 (English)In: INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW, ISSN 0142-727X, Vol. 61, p. 108-116Article in journal (Refereed) Published
Abstract [en]

Direct numerical simulations (DNSs), are performed to investigate turbulent flows in toroidal pipes with two different curvatures. By means of proper orthogonal decomposition (POD), dominant coherent structures in the flow are identified. The most energetic structures in the strongly curved pipes (with curvature kappa = 0.1 and kappa = 0.3 and Re-b = 11, 700 based on bulk velocity and diameter) are very similar in structure for both configurations studied. The dominant modes (shape and frequency) appear to match the coherent structures responsible for the swirl switching phenomenon found earlier in experimental and numerical studies of turbulent flow in spatially developing 90 bends, with which the current results are compared. The fact that turbulence in the toroidal pipe features low-frequency coherent structures very similar to swirl switching is relevant as it may challenge the current hypothesis regarding the origin of swirl switching, which is usually connected to the conditions in the upstream straight section. However, the toroidal pipe is homogeneous in the streamwise direction and does as such not feature a straight part.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 61, p. 108-116
Keywords [en]
Wall turbulence, Secondary motion, Pipe flow, Curved pipes, Dean vortices, Coherent motion, Swirl switching
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-200235DOI: 10.1016/j.ijheatfluidflow.2016.05.021ISI: 000390745800012Scopus ID: 2-s2.0-84994151969OAI: oai:DiVA.org:kth-200235DiVA, id: diva2:1073680
Note

QC 20160213

Available from: 2017-02-13 Created: 2017-02-13 Last updated: 2017-03-07Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
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  • de-DE
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Output format
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