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dc.contributor.author
Manickathan, Lento
dc.contributor.author
Defraeye, Thijs
dc.contributor.author
Allegrini, Jonas
dc.contributor.author
Derome, Dominique
dc.contributor.author
Carmeliet, Jan
dc.date.accessioned
2020-11-04T10:35:26Z
dc.date.available
2018-09-27T07:47:36Z
dc.date.available
2018-09-27T08:55:44Z
dc.date.available
2020-11-04T10:35:26Z
dc.date.issued
2018-10
dc.identifier.issn
1618-8667
dc.identifier.other
10.1016/j.ufug.2018.09.011
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/291897
dc.identifier.doi
10.3929/ethz-b-000291897
dc.description.abstract
The influence of trees in urban areas is typically assessed using urban microclimate models. These models rely on wind tunnel experiments using small-scale tree models to verify and validate their predictions of the flow field. However, it is not known sufficiently to which extent small model trees used in wind tunnel studies can recreate the behavior of large trees found in cities. In the present study, the drag coefficient and the turbulent flow downstream of model trees are compared with the ones of natural trees of a similar size to determine whether both types of tree provide similar aerodynamic characteristics. Therefore, measurements of the drag force and the flow field, using particle image velocimetry, are performed. The aerodynamic characteristics of the small trees are compared with the ones measured on larger mature trees from previous studies. The present study shows that the drag coefficients of model and natural trees are similar only if both types have a similar aerodynamic porosity and if the model tree can undergo an aerodynamic reconfiguration similar to that of a natural tree. Such reconfiguration implies the reorientation of the branches and leaves due to wind. A study on the influence of seasonal foliar density variation shows that the foliage configuration plays a critical role on the drag coefficient and the flow field. A defoliated tree, such as a deciduous tree in winter, is shown to have a substantially lower drag coefficient and a negligible influence on the flow.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Elsevier
en_US
dc.rights.uri
http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subject
Drag coefficient
en_US
dc.subject
Model trees
en_US
dc.subject
Natural trees
en_US
dc.subject
Particle image velocimetry
en_US
dc.subject
Wind tunnel
en_US
dc.title
Comparative study of flow field and drag coefficient of model and small natural trees in a wind tunnel
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
dc.date.published
2018-09-24
ethz.journal.title
Urban Forestry & Urban Greening
ethz.journal.volume
35
en_US
ethz.pages.start
230
en_US
ethz.pages.end
239
en_US
ethz.size
27 p. accepted version
en_US
ethz.version.deposit
acceptedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Jena
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02130 - Dep. Maschinenbau und Verfahrenstechnik / Dep. of Mechanical and Process Eng.::03806 - Carmeliet, Jan / Carmeliet, Jan
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02130 - Dep. Maschinenbau und Verfahrenstechnik / Dep. of Mechanical and Process Eng.::03806 - Carmeliet, Jan / Carmeliet, Jan
ethz.date.deposited
2018-09-27T07:47:37Z
ethz.source
FORM
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.date.embargoend
2020-11-01
ethz.rosetta.installDate
2018-09-27T08:55:50Z
ethz.rosetta.lastUpdated
2021-02-15T19:43:48Z
ethz.rosetta.versionExported
true
ethz.COinS
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