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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: 0000-0002-4346-4732
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0001-9627-5903
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2012 (English)In: Journal of turbomachinery, ISSN 0889-504X, E-ISSN 1528-8900, Vol. 135, no 1, 011019- p.Article in journal (Refereed) Published
Abstract [en]

An artificial turbulent spot is simulated in a zero free-stream turbulence base flow and a base flow with organized streaks. Six identification methods are used in order to isolate the turbulent spot from the surrounding nonturbulent fluid. These are (i) instantaneous wall-normal velocity v, (ii) instantaneous spanwise velocity w, (iii) instantaneous turbulent dissipation, (iv) lambda(2) 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 organized streaks case. For both cases the v technique was the most sensitive to changes in threshold level.

Place, publisher, year, edition, pages
2012. Vol. 135, no 1, 011019- p.
Keyword [en]
Baseflows, Finite-time Lyapunov exponent, Freestream turbulence, Identification method, Spanwise velocity, Threshold levels, Transitional boundary layers, Turbulent dissipation, Turbulent spots, Aerodynamics, Turbulent flow
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-107263DOI: 10.1115/1.4006395ISI: 000312989900019Scopus ID: 2-s2.0-84868105811OAI: oai:DiVA.org:kth-107263DiVA: diva2:575411
Funder
Swedish e‐Science Research Center
Note

QC 20121210

Available from: 2012-12-10 Created: 2012-12-10 Last updated: 2017-12-07Bibliographically approved

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Brandt, LucaSchlatter, Philipp

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