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.
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ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition
June 6–10, 2011
Vancouver, British Columbia, Canada
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-5465-5
PROCEEDINGS PAPER
Identifying Turbulent Spots in Transitional Boundary Layers
Brendan Rehill,
Brendan Rehill
University of Limerick, Limerick, Ireland
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Ed J. Walsh,
Ed J. Walsh
University of Limerick, Limerick, Ireland
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Philipp Schlatter,
Philipp Schlatter
KTH, Stockholm, Sweden
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Tamer A. Zaki,
Tamer A. Zaki
Imperial College London, London, UK
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Donald M. McEligot
Donald M. McEligot
University of Idaho, Idaho Falls, ID
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Brendan Rehill
University of Limerick, Limerick, Ireland
Ed J. Walsh
University of Limerick, Limerick, Ireland
Philipp Schlatter
KTH, Stockholm, Sweden
Luca Brandt
KTH, Stockholm, Sweden
Tamer A. Zaki
Imperial College London, London, UK
Donald M. McEligot
University of Idaho, Idaho Falls, ID
Paper No:
GT2011-46385, pp. 1859-1868; 10 pages
Published Online:
May 3, 2012
Citation
Rehill, B, Walsh, EJ, Schlatter, P, Brandt, L, Zaki, TA, & McEligot, DM. "Identifying Turbulent Spots in Transitional Boundary Layers." Proceedings of the ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition. Volume 5: Heat Transfer, Parts A and B. Vancouver, British Columbia, Canada. June 6–10, 2011. pp. 1859-1868. ASME. https://doi.org/10.1115/GT2011-46385
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