Original title: Temporal, Spatial, and Spatio-temporal correlation of the velocity fluctuations
Authors: Jurčáková, Klára
Document type: Papers
Conference/Event: International Workshop on Physical Modeling of Flow and Dispersion Phenomena, Prague (CZ), 20220829
Year: 2022
Language: eng
Abstract: 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.
Keywords: frozen turbulence; integral length scales; Particle Image Velocimetry; wind tunnel
Project no.: GA18-09539S (CEP), GA15-18964S (CEP), LTC20056
Funding provider: GA ČR, GA ČR, GA TA ČR
Host item entry: International Workshop on Physical Modeling of Flow and Dispersion Phenomena - Book of Abstracts, ISBN 978-80-87012-81-9

Institution: Institute of Thermomechanics AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: https://hdl.handle.net/11104/0337622

Permalink: http://www.nusl.cz/ntk/nusl-512230


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