Number of the records: 1

Turbulent Boundary Layer generated Over Two Urban Roughnesses

SYSNO ASEP	0333098
Document Type	C - Proceedings Paper (int. conf.)
R&D Document Type	Conference Paper
Title	Turbulent Boundary Layer generated Over Two Urban Roughnesses
Author(s)	Kellnerová, Radka (UT-L)_{RID, ORCID} Jaňour, Zbyněk (UT-L)_{RID, ORCID}
Source Title	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
Pages	s. 109-118
Number of pages	10 s.
Action	Experimental Fluid Mechanics 2009
Event date	25.11.2009-27.11.2009
VEvent location	Liberec
Country	CZ - Czech Republic
Event type	EUR
Language	eng - English
Country	CZ - Czech Republic
Keywords	street canyon ; flat and pitched roof ; quadrant analysis ; wavelet analysis
Subject RIV	DG - Athmosphere Sciences, Meteorology
R&D Projects	OC 113 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
CEZ	AV0Z20760514 - UT-L (2005-2011)
UT WOS	000276954300014
Annotation	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.
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	2010

Number of the records: 1