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Swirl-switching phenomenon in turbulent flow through toroidal pipes
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 KTH, Superseded Departments (pre-2005), Mechanics. KTH, Centres, SeRC - Swedish e-Science Research Centre. KTH, School of Engineering Sciences (SCI), Mechanics, Fluid Mechanics of Industrial Processes.ORCID iD: 0000-0001-9627-5903
2015 (English)In: 9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015, TSFP-9 , 2015Conference paper, Published paper (Refereed)
Abstract [en]

Direct numerical simulations (DNS) are performed to investigate turbulent flows in toroidal pipes with mild and strong curvature. By means of proper orthogonal decomposition (POD), dominant structures in the flow field are identified. The most energetic structures in the strongly curved pipes (κ = 0.1 and κ = 0.3) are very similar in both configurations studied here. These modes (shape and frequency) also match the coherent structures responsible for 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 observed swirl switching in toroidal pipes, which is isolated from any upstream and separation conditions, may challenge the current hyphothesis regarding the origin of swirl switching mechanism.

Place, publisher, year, edition, pages
TSFP-9 , 2015.
Keyword [en]
Principal component analysis, Switching, Turbulence, Turbulent flow, Coherent structure, Curved pipes, Experimental and numerical studies, Proper orthogonal decompositions, Separation condition, Switching mechanism, Switching phenomenon, Shear flow
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-222958ISI: 000390745800012Scopus ID: 2-s2.0-85034436337ISBN: 9780000000002 OAI: oai:DiVA.org:kth-222958DiVA, id: diva2:1193499
Conference
9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015, 30 June 2015 through 3 July 2015
Note

QC 20180327

Available from: 2018-03-27 Created: 2018-03-27 Last updated: 2018-03-27Bibliographically approved

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Noorani, AzadSchlatter, Philipp

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MechanicsLinné Flow Center, FLOWStability, Transition and ControlMechanicsSeRC - Swedish e-Science Research CentreFluid Mechanics of Industrial Processes
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