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Quadrant analysis of boundary layer above pitched and flat roofs

SYSNO ASEP	0343445
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Ostatní články
Title	Quadrant analysis of boundary layer above pitched and flat roofs
Author(s)	Kellnerová, Radka (UT-L)_{RID, ORCID} Kukačka, Libor (UT-L)_RID Jaňour, Zbyněk (UT-L)_{RID, ORCID}
Number of authors	3
Source Title	Acta Technica CSAV. - : Ústav termomechaniky AV ČR, v. v. i. - ISSN 0001-7043 Roč. 54, č. 4 (2009), s. 401-413
Number of pages	13 s.
Language	eng - English
Country	CZ - Czech Republic
Keywords	street canyon ; flat and pitched roofs ; quadrant analysis
Subject RIV	DG - Athmosphere Sciences, Meteorology
CEZ	AV0Z20760514 - UT-L (2005-2011)
Annotation	Boundary layer over two types of urban roughness in wind-tunnel is investigated. The roughness is composed from rows of street canyons with two shapes of roof— flat and pitched. Different roofs produce different internal boundary layers above canyons. A layer generated by pitched roofs, is significantly more turbulent since it provides a larger vertical variation for the wind passing above. Momentum flux and corresponding transport exhibits diverse development, extension and magnitude as well. Ventilation in streets is therefore distinct from each other. Flat roofs generate rather larger eddies in street canyon, which does not disturb the ventilation significantly. Adversely, geometry of pitched roofs enables to wind to attack on the core of recirculation zone and break it. Quadrant analysis is applied for vertical profiles and cross-sectional areas in canyons in order to detect a domination of sweep or ejection events and to find a linkage to the third moment of velocity for both cases.
Workplace	Institute of Thermomechanics
Contact	Marie Kajprová, kajprova@it.cas.cz, Tel.: 266 053 154 ; Jana Lahovská, jaja@it.cas.cz, Tel.: 266 053 823
Year of Publishing	2011

Number of the records: 1