Název:
Temporal, Spatial, and Spatio-temporal correlation of the velocity fluctuations
Autoři:
Jurčáková, Klára Typ dokumentu: Příspěvky z konference Konference/Akce: International Workshop on Physical Modeling of Flow and Dispersion Phenomena, Prague (CZ), 20220829
Rok:
2022
Jazyk:
eng
Abstrakt: Taylor's hypothesis about frozen turbulence [1] says that if the turbulence intensity is small compared to the mean velocity then the advection of a turbulent flow field past a fixed point can be taken entirely due to the mean flow. This means that in the “frozen turbulent field” spatial and temporal dimensions can be interchanged. Although the main assumption of Taylor's hypothesis is not met in the atmospheric boundary layer (the intensity of turbulence is usually between 10 and 20%) the hypothesis is commonly used to calculate integral length scales of turbulent fields from point measurements. Particle image velocimetry with high temporal resolution (TR-PIV) allows us to analyze both temporal and spatial cross-correlations in the turbulent flow fields and to evaluate obtained results.
Klíčová slova:
frozen turbulence; integral length scales; Particle Image Velocimetry; wind tunnel Číslo projektu: GA18-09539S (CEP), GA15-18964S (CEP), LTC20056 Poskytovatel projektu: GA ČR, GA ČR, GA TA ČR Zdrojový dokument: International Workshop on Physical Modeling of Flow and Dispersion Phenomena - Book of Abstracts, ISBN 978-80-87012-81-9
Instituce: Ústav termomechaniky AV ČR
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Informace o dostupnosti dokumentu:
Dokument je dostupný v příslušném ústavu Akademie věd ČR. Původní záznam: https://hdl.handle.net/11104/0337622