Název: Proper Orthogonal Decomposition of Turbulent Flow above Urban Area
Autoři: Kellnerová, Radka ; Kukačka, Libor ; Uruba, Václav ; Jurčáková, Klára ; Jaňour, Zbyněk
Typ dokumentu: Příspěvky z konference
Konference/Akce: Topical Problems of Fluid Mechanics 2011, Praha (CZ), 2011-02-16 / 2011-02-17
Rok: 2011
Jazyk: eng
Abstrakt: 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
Klíčová slova: flat roof; pitched roof; POD; street canyons; wind-channel
Číslo projektu: CEZ:AV0Z20760514 (CEP)
Zdrojový dokument: Conference Topical Problems of Fluid Mechanics 2011, ISBN 978-80-87012-32-1

Instituce: Ústav termomechaniky AV ČR (web)
Informace o dostupnosti dokumentu: Dokument je dostupný v příslušném ústavu Akademie věd ČR.
Původní záznam: http://hdl.handle.net/11104/0199374

Trvalý odkaz NUŠL: http://www.nusl.cz/ntk/nusl-55925


Záznam je zařazen do těchto sbírek:
Věda a výzkum > AV ČR > Ústav termomechaniky
Konferenční materiály > Příspěvky z konference