Original title: Spatial and temporal correlations in turbulent boundary layers
Authors: Jurčáková, Klára ; Kellnerová, Radka
Document type: Papers
Conference/Event: Symposium on anemometry /32./, Holany - Litice (CZ), 20180529
Year: 2018
Language: eng
Abstract: The experimental data from time-resolved particle image velocimetry measurement of the boundary-layer flows over various aerodynamically rough surfaces are presented. Temporal, spatial, and time-space correlation are analyzed and used for calculation of integral length and time scales. Temporal and spatial integral scales are connected via convection velocity. Taylor's hypothesis on frozen turbulence says that the convection velocity is equal to the local mean velocity. The experimental data shows that the convection velocity is larger than local mean velocity in the lower third of the boundary layer and greater in the upper two thirds. The cross-over line is higher over surfaces with higher roughness.
Keywords: aerodynamically rough surfaces; integral length scales; time-resolved particle image velocimetry; wind tunnel
Project no.: GA18-09539S (CEP)
Funding provider: GA ČR
Host item entry: 32nd Symposium on anemometry: proceedings, ISBN 978-80-87117-17-0

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/11104/0291718

Permalink: http://www.nusl.cz/ntk/nusl-391441


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