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PIV measurement of turbulent flow within a street canyon: Detection of coherent motion
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SYSNO ASEP 0376552 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title PIV measurement of turbulent flow within a street canyon: Detection of coherent motion Author(s) Kellnerová, Radka (UT-L) RID, ORCID
Kukačka, Libor (UT-L) RID
Jurčáková, Klára (UT-L) RID, ORCID
Uruba, Václav (UT-L) RID, ORCID
Jaňour, Zbyněk (UT-L) RID, ORCIDSource Title Journal of Wind Engineering and Industrial Aerodynamics. - : Elsevier - ISSN 0167-6105
Roč. 104, SI (2012), s. 302-313Number of pages 12 s. Publication form Print - P Action International Conference on Wind Engineering /13./ Event date 10.07.2011-15.07.2011 VEvent location Amsterdam Country NL - Netherlands Event type WRD Language eng - English Country NL - Netherlands Keywords wind-channel ; street canyon ; quadrant analysis ; wavelet analysis ; PIV ; POD Subject RIV DG - Athmosphere Sciences, Meteorology CEZ AV0Z20760514 - UT-L (2005-2011) UT WOS 000307609200032 DOI 10.1016/j.jweia.2012.02.017 Annotation Velocity measurements inside a street canyon were performed by means of particle image velocimetry (PIV) in a wind-channel. Two geometries were used for comparison purposes: buildings with pitched roofs and with flat roofs. Both induce different dynamic regimes in the street. Velocity data were analysed by proper orthogonal decomposition (POD). POD identifies the most dominant modes with high coherency in the flow and also evaluates the relative contributions of each mode to the kinetic energy of turbulence. Rigorous analysis of correctness of the physical interpretation of such decomposition was carried out. POD reconstruction of the original vector field was performed and the accuracy of the method was evaluated. Wavelet analysis was applied to the time-series of the POD expansion coefficients in order to reveal frequency present in the modes. Vorticity was decomposed by POD as well. Finally, the correlation between the vorticity and other methods for vortex detection was assessed. 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 2013
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