On the quadrant analysis of the flow in the street canyon

0396486 - ÚT 2014 RIV FR eng C - Conference Paper (international conference)
Kellnerová, Radka - Fuka, V. - Kukačka, Libor - Uruba, Václav - Jaňour, Zbyněk
On the quadrant analysis of the flow in the street canyon.
EFM12 - EXPERIMENTAL FLUID MECHANICS 2012. Liberec: Technical University of Liberec, 2013 - (Dančová, P.; Novotný, P.), s. 1-5. EPJ Web of Conferences, 45. ISBN 978-80-7372-912-7. ISSN 2100-014X.
[International Conference on Experimental Fluid Mechanics /7/. Liberec (CZ), 20.11.2013-23.11.2013]
R&D Projects: GA ČR GAP101/12/1554
Institutional support: RVO:61388998
Keywords : atmospheric boundary layer * wind tunnel modelling * urban area ventilation * quadrant analysis
Subject RIV: BK - Fluid Dynamics

It is well known that sweep and ejection are major contributors to the momentum flux in the turbulent boundary layer. In order to evaluate the contribution of these events to the total flux, the wind-tunnel data measured by PIV technique were analyzed from spatial point of view. It was revealed that both the sweep and the ejection reach up to 90% of the flux momentum inside the canyon. Moreover, the sweep and ejection pass the street in an alternative fashion. When sweep reaches maximum, the ejection falls down to minimum and vice versa. The TKE energy is also very high in these particular events, reaching 80-90% of total TKE inside the street what makes the sweep and ejection to be the most important features in the flow.
Permanent Link: http://hdl.handle.net/11104/0224266