Identifying an Artificial Turbulent Spot in the Boundary Layer

Rehill B, Walsh EJ, Brandt L, Schlatter P, Zaki TA (2012)

Publication Type: Conference contribution

Publication year: 2012

Publisher: Springer Science and Business Media Deutschland GmbH

Book Volume: 141

Pages Range: 217-220

Conference Proceedings Title: Springer Proceedings in Physics

Event location: Bertinoro, ITA

ISBN: 9783642289675

DOI: 10.1007/978-3-642-28968-2_46

Abstract

An artificial turbulent spot in a boundary layer with zero freestream turbulence and zero pressure gradient is studied through direct numerical simulation. The spot, generated by a vortex pair disturbance, is identified from the surrounding non-turbulent fluid using six different methods of identification. These techniques involved setting thresholds for: instantaneous wall normal velocity, spanwise velocity, turbulent dissipation, λ2-criterion, Q-criterion and the Finite Time Lyapunov Exponent. A sensitivty analysis was performed based on the sensitivity of the maximum spot dimensions to the change in threshold level from it’s original value. The maximum height, width, length and volume of the spot was recorded for changes in threshold level. Based on this analysis the Q-criterion was found to be the most suitable for identifying a turbulent spot in a flow with zero freestream turbulence.

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)

How to cite

APA:

Rehill, B., Walsh, E.J., Brandt, L., Schlatter, P., & Zaki, T.A. (2012). Identifying an Artificial Turbulent Spot in the Boundary Layer. In Martin Oberlack, Joachim Peinke, Michael Holling, Alessandro Talamelli, Luciano Castillo (Eds.), Springer Proceedings in Physics (pp. 217-220). Bertinoro, ITA: Springer Science and Business Media Deutschland GmbH.

MLA:

Rehill, Brendan, et al. "Identifying an Artificial Turbulent Spot in the Boundary Layer." Proceedings of the 4th Conference on Turbulence, iTi 2010, Bertinoro, ITA Ed. Martin Oberlack, Joachim Peinke, Michael Holling, Alessandro Talamelli, Luciano Castillo, Springer Science and Business Media Deutschland GmbH, 2012. 217-220.

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