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Numerical and experimental studies of wind environment in an urban morphology
Högskolan i Gävle, Institutionen för teknik och byggd miljö.
Högskolan i Gävle, Institutionen för teknik och byggd miljö, Ämnesavdelningen för inomhusmiljö. (Lab. Ventilation och Luftkvalité)
Högskolan i Gävle, Institutionen för teknik och byggd miljö, Ämnesavdelningen för byggnadskvalitet.
Högskolan i Gävle, Institutionen för teknik och byggd miljö, Ämnesavdelningen för inomhusmiljö. (Ventilation och Luftkvalité)
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2005 (engelsk)Inngår i: Atmospheric Environment, ISSN 1352-2310, E-ISSN 1873-2844, Vol. 39, nr 33, s. 6147-6158Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The purpose of the paper is to examine the relation between urban morphology (three-dimensional structure) and windiness. We regard a city as a porous obstacle, which is open at the top. We consider the interaction between the atmospheric boundary layer and a city to be both a function of the overall shape (silhouette or skyline) and the internal resistance to the flow caused by the friction when the wind flows over the urban surfaces. We regard the street pattern as an interconnected flow network with the crossings as nodes. Flow, along the streets is generated by pressure differences.

We here use a highly idealized city model consisting of a circular block divided into two or four equally large sectors. Two types of cases are studied, the first with only one street through the city model with different angles between the street and the oncoming wind. The second case also contains a perpendicularly crossing street (through the center). Both wind tunnel experiments and numerical flow computations (computational fluid dynamics, CFD) are used and compared. The general agreement between the two is good and the CFD method offers new possibilities for quantifying the urban wind environment. (c) 2005 Elsevier Ltd. All rights reserved.

sted, utgiver, år, opplag, sider
2005. Vol. 39, nr 33, s. 6147-6158
Emneord [en]
city model, street canyon, boundary layer, wind tunnel, computer simulation
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Identifikatorer
URN: urn:nbn:se:hig:diva-883DOI: 10.1016/j.atmosenv.2005.06.052ISI: 000232762600013Scopus ID: 2-s2.0-25844492158OAI: oai:DiVA.org:hig-883DiVA, id: diva2:117545
Tilgjengelig fra: 2007-12-10 Laget: 2007-12-10 Sist oppdatert: 2018-03-13bibliografisk kontrollert

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Sandberg, MatsWesterberg, UllaClaesson, Leif

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