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Identifying an Artificial Turbulent Spot in the Boundary Layer
Univ Limerick, Limerick, Ireland..
Univ Limerick, Limerick, Ireland..
KTH, School of Engineering Sciences (SCI), Mechanics, Fluid Mechanics of Industrial Processes. KTH, Stockholm, Sweden..ORCID iD: 0000-0002-4346-4732
KTH, School of Engineering Sciences (SCI), Mechanics, Fluid Mechanics of Industrial Processes. KTH, Stockholm, Sweden..ORCID iD: 0000-0001-9627-5903
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2012 (English)In: PROGRESS IN TURBULENCE AND WIND ENERGY IV / [ed] Oberlack, M Peinke, J Talamelli, A Castillo, L Holling, M, SPRINGER-VERLAG BERLIN , 2012, p. 217-220Conference paper, Published paper (Refereed)
Abstract [en]

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, lambda(2)-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.

Place, publisher, year, edition, pages
SPRINGER-VERLAG BERLIN , 2012. p. 217-220
Series
Springer Proceedings in Physics, ISSN 0930-8989 ; 141
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-245338ISI: 000392536300046ISBN: 978-3-642-28968-2 (print)OAI: oai:DiVA.org:kth-245338DiVA, id: diva2:1294804
Conference
4th Interdisciplinary Turbulence Initiative (ITI) Conference, 2010, Bertinoro, ITALY
Note

QC 20190308

Available from: 2019-03-08 Created: 2019-03-08 Last updated: 2019-03-08Bibliographically approved

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Brandt, LucaSchlatter, Philipp

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