Počet záznamů: 1

Quadrant analysis of boundary layer above pitched and flat roofs

SYSNO ASEP	0343445
Druh ASEP	J - Článek v odborném periodiku
Zařazení RIV	J - Článek v odborném periodiku
Poddruh J	Ostatní články
Název	Quadrant analysis of boundary layer above pitched and flat roofs
Tvůrce(i)	Kellnerová, Radka (UT-L)_{RID, ORCID} Kukačka, Libor (UT-L)_RID Jaňour, Zbyněk (UT-L)_{RID, ORCID}
Celkový počet autorů	3
Zdroj.dok.	Acta Technica CSAV. - : Ústav termomechaniky AV ČR, v. v. i. - ISSN 0001-7043 Roč. 54, č. 4 (2009), s. 401-413
Poč.str.	13 s.
Jazyk dok.	eng - angličtina
Země vyd.	CZ - Česká republika
Klíč. slova	street canyon ; flat and pitched roofs ; quadrant analysis
Vědní obor RIV	DG - Vědy o atmosféře, meteorologie
CEZ	AV0Z20760514 - UT-L (2005-2011)
Anotace	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.
Pracoviště	Ústav termomechaniky
Kontakt	Marie Kajprová, kajprova@it.cas.cz, Tel.: 266 053 154 ; Jana Lahovská, jaja@it.cas.cz, Tel.: 266 053 823
Rok sběru	2011

Počet záznamů: 1