Comparison between flow dynamics inside street canyon with two geometries of roof shape

0346064 - ÚT 2011 FR eng A - Abstract
Kellnerová, Radka - Kukačka, Libor - Jaňour, Zbyněk
Comparison between flow dynamics inside street canyon with two geometries of roof shape.
Proceedings of the 13th International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes. Boulogne-Billancourt: ARIA Technologies, 2010. s. 639-640. ISBN 2-8681-5062-4.
[International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes /13./. 01.06.2010-04.06.2010, Paris]
Institutional research plan: CEZ:AV0Z20760514
Keywords : street cenyon * shape of roof * quadrant analysis * Wavelet analysis * POD
Subject RIV: DG - Athmosphere Sciences, Meteorology
www.harmo.org

Flow dynamics above two shapes of roof geometries in urban area are investigated in wind-tunnel experiment. Urban models consist from long series of street canyons with flat or pitched roofs. Different shape of roofs induces different turbulence above the canyon as well as dynamics of intermittent motions. The first part of experiment uses one-point LDA measurement and moments of higher order like skewness and flatness of velocity point out a locality where extreme wind events take place. Momentum flux is analyzed with quadrant analysis what enables to reveal the regions with statistical dominance of /"sweep/" or /"ejection/" events. Fourier analysis and wavelet analysis are applied at several altitudes inside boundary layer in order to determine typical wavelength of highly energetic patterns. Preliminary study using PIV is conducted in wind channel with the same models. Vorticity, vortex core and energetic modes using POD method are calculated.
Permanent Link: http://hdl.handle.net/11104/0187184