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Identifying turbulent spots in transitional boundary layers
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0001-9627-5903
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-4346-4732
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2011 (English)In: Proc. ASME Turbo Expo, 2011, no PARTS A AND B, 1859-1868 p.Conference paper, Published paper (Refereed)
Abstract [en]

An artificial turbulent spot is simulated in a zero free-stream turbulence base flow and a base flow with organised streaks. Six identification methods are used in order to isolate the turbulent spot from the surrounding non-turbulent fluid. These are (i) instantaneous wall-normal velocity, v′, (ii) instantaneous spanwise velocity, w′, (iii) instantaneous turbulent dissipation, (iv) λ2 - criterion, (v) Q - criterion and (vi) gradient of the Finite Time Lyapunov Exponent. All methods are effective in isolating the turbulent spot from the streaks. The robustness of each technique is determined from the sensitivity of the maximum spot dimensions to changes in threshold level. The Q-criterion shows the least sensitivity for the zero free-stream turbulence case and the instantaneous turbulent dissipation technique is least sensitive in the organised streaks case. For both cases the v′ technique was the most sensitive to changes in threshold level.

Place, publisher, year, edition, pages
2011. no PARTS A AND B, 1859-1868 p.
Series
Proceedings of the ASME Turbo Expo, 5
Keyword [en]
Baseflows, Finite-time Lyapunov exponent, Freestream turbulence, Identification method, Spanwise velocity, Threshold levels, Transitional boundary layers, Turbulent dissipation, Turbulent spots, Aerodynamics, Exhibitions, Turbines, Turbulent flow
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-150191DOI: 10.1115/GT2011-46385ISI: 000321076300164Scopus ID: 2-s2.0-84865508460ISBN: 9780791854655 (print)OAI: oai:DiVA.org:kth-150191DiVA: diva2:743898
Conference
ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition, GT2011, 6-10 June 2011, Vancouver, BC, Canada
Note

QC 20140905

Available from: 2014-09-05 Created: 2014-09-01 Last updated: 2014-10-03Bibliographically approved

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Schlatter, PhilippBrandt, Luca

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