Identifying turbulent spots in transitional boundary layers

Rehill B, Walsh EJ, Schlatter P, Brandt L, Zaki TA, McEligot DM (2011)

Publication Type: Conference contribution

Publication year: 2011

Book Volume: 5

Pages Range: 1859-1868

Conference Proceedings Title: Proceedings of the ASME Turbo Expo

Event location: CAN

ISBN: 9780791854655

DOI: 10.1115/GT2011-46385

Abstract

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. Copyright © 2011 by ASME.

Authors with CRIS profile

Philipp Schlatter

Involved external institutions

University of Limerick IE Ireland (IE) Royal Institute of Technology / Kungliga Tekniska Högskolan (KTH) SE Sweden (SE) Imperial College London / The Imperial College of Science, Technology and Medicine GB United Kingdom (GB) University of Idaho US United States (USA) (US)

How to cite

APA:

Rehill, B., Walsh, E.J., Schlatter, P., Brandt, L., Zaki, T.A., & McEligot, D.M. (2011). Identifying turbulent spots in transitional boundary layers. In Proceedings of the ASME Turbo Expo (pp. 1859-1868). CAN.

MLA:

Rehill, Brendan, et al. "Identifying turbulent spots in transitional boundary layers." Proceedings of the ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition, GT2011, CAN 2011. 1859-1868.

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