Original title: Proper Orthogonal Decomposition of Turbulent Flow above Urban Area
Authors: Kellnerová, Radka ; Kukačka, Libor ; Uruba, Václav ; Jurčáková, Klára ; Jaňour, Zbyněk
Document type: Papers
Conference/Event: Topical Problems of Fluid Mechanics 2011, Praha (CZ), 2011-02-16 / 2011-02-17
Year: 2011
Language: eng
Abstract: This contribution describes the character of turbulent flow generated above series of street canyons in wind-channel. Main concern is to clarify how intermittent dynamics of the flow determines the ventilation process inside the canyon. Since geometry of building around street canyon significantly affects the flow regime, two shapes of building are studied and comparison of these two regimes is done. During experiment, velocity data are measured using PIV with high-repetition rate. Over than three thousand snapshots of instantaneous velocity are then analysed by Proper Orthogonal Decomposition (POD). This method reveals the measure of coherence of the flow and decomposes the individual snapshots into dynamics modes. For example, the first mode in shear layer (localised at the roof level) contains almost 55% of global turbulent kinetic energy, what is an in
Keywords: flat roof; pitched roof; POD; street canyons; wind-channel
Project no.: CEZ:AV0Z20760514 (CEP)
Host item entry: Conference Topical Problems of Fluid Mechanics 2011, ISBN 978-80-87012-32-1

Institution: Institute of Thermomechanics AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0199374

Permalink: http://www.nusl.cz/ntk/nusl-55925


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Research > Institutes ASCR > Institute of Thermomechanics
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