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An experimental analysis of canopy flows
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0001-8667-0520
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. (SGCE)ORCID iD: 0000-0002-3251-8328
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-1146-3241
2011 (English)In: 13th European Turbulence Conference, ETC13: Geophysical and Magnetohydrodynamic Turbulence, Institute of Physics Publishing (IOPP), 2011, Vol. 318, 072018Conference paper, Published paper (Refereed)
Abstract [en]

An analysis of forest canopy flows with a wind tunnel model at high Reynoldsnumber is presented and discussed. Measured mean velocity and Reynolds stress profiles agreewith observations made in real canopies with no sensible Reynolds number dependence, addingconfidence to the results obtained with the present setup. The analysis of power densityspectra of the three velocity components and of the shear stress co-spectra is reported withnew coordinate scalings able to improve the collapse of the spectra compared to standardnormalizations. This scaling is mostly based on the respective integral time scale and a simple fitis proposed to estimate such a quantity in real canopies. From the analysis of joint probabilitydensity functions, three different regions have been localized where a change in the coherentstructure behavior is supposed to take place, similarly to what happens in rough wall turbulentboundary layers.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2011. Vol. 318, 072018
Series
Journal of Physics Conference Series, ISSN 1742-6588
Keyword [en]
Coherent structure Experimental analysis Forest canopies High Reynolds number Integral time scale Joint probability density function Mean velocities Power density spectrum Reynolds stress Scalings Turbulent boundary layers Velocity components Wind tunnel models
National Category
Other Engineering and Technologies not elsewhere specified
Identifiers
URN: urn:nbn:se:kth:diva-87084DOI: 10.1088/1742-6596/318/7/072018ISI: 000301128000018Scopus ID: 2-s2.0-84856350252OAI: oai:DiVA.org:kth-87084DiVA: diva2:501366
Conference
EUROMECH, 13th European Turbulence Conference, Sept. 12-15, Warsaw
Funder
StandUp for Wind
Note

QC 20120411

Available from: 2012-02-14 Created: 2012-02-14 Last updated: 2017-01-18Bibliographically approved

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Segalini, AntonioFransson, Jens H. M.Alfredsson, P. Henrik

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