PIV measurement of turbulent flow within a street canyon: Detection of coherent motion

0376552 - ÚT 2013 RIV NL eng J - Journal Article
Kellnerová, Radka - Kukačka, Libor - Jurčáková, Klára - Uruba, Václav - Jaňour, Zbyněk
PIV measurement of turbulent flow within a street canyon: Detection of coherent motion.
Journal of Wind Engineering and Industrial Aerodynamics. Roč. 104, SI (2012), s. 302-313. ISSN 0167-6105. E-ISSN 1872-8197.
[International Conference on Wind Engineering /13./. Amsterdam, 10.07.2011-15.07.2011]
Institutional research plan: CEZ:AV0Z20760514
Keywords : wind-channel * street canyon * quadrant analysis * wavelet analysis * PIV * POD
Subject RIV: DG - Athmosphere Sciences, Meteorology
Impact factor: 1.342, year: 2012
http://www.sciencedirect.com/science/article/pii/S0167610512000414

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.
Permanent Link: http://hdl.handle.net/11104/0208920