Počet záznamů: 1

Turbulent Boundary Layer generated Over Two Urban Roughnesses

SYSNO ASEP	0333098
Druh ASEP	C - Konferenční příspěvek (mezinárodní konf.)
Zařazení RIV	D - Článek ve sborníku
Název	Turbulent Boundary Layer generated Over Two Urban Roughnesses
Tvůrce(i)	Kellnerová, Radka (UT-L)_{RID, ORCID} Jaňour, Zbyněk (UT-L)_{RID, ORCID}
Zdroj.dok.	Experimental Fluid Mechanics 2009, Proceedings of the International Conference. - Liberec : Technical University of Liberec, 2009 / Vít T. ; Dančová P. ; Dvořák V. - ISBN 978-80-7372-538-9
Rozsah stran	s. 109-118
Poč.str.	10 s.
Akce	Experimental Fluid Mechanics 2009
Datum konání	25.11.2009-27.11.2009
Místo konání	Liberec
Země	CZ - Česká republika
Typ akce	EUR
Jazyk dok.	eng - angličtina
Země vyd.	CZ - Česká republika
Klíč. slova	street canyon ; flat and pitched roof ; quadrant analysis ; wavelet analysis
Vědní obor RIV	DG - Vědy o atmosféře, meteorologie
CEP	OC 113 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy
CEZ	AV0Z20760514 - UT-L (2005-2011)
UT WOS	000276954300014
Anotace	As a basis for PIV measurement, turbulent characteristics of a flow were investigated by LDA over two different types of urban roughness in wind-tunnel. The roughness consists from long series of street canyons with unit aspect ratio. Different shapes of roof - flat and pitched - provide a different internal boundary layer above canyons. The latter one, generated by pitched roofs, is significantly more turbulent and thus slower then above flat roofs. Momentum flux and corresponding transport exhibits the largest deviation specially at the roof level. Ventilation in the streets is therefore distinct from each other. Quadrant analysis was 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. The overall goal of the project is to find any of coherent structure produced by the roof edge as a low momentum region or an ejection formed by hairpin.
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	2010

Počet záznamů: 1