Original title: Large Scale Motions in Turbulent Flows
Authors: Kellnerová, Radka ; Jurčáková, Klára ; Procházka, Pavel P.
Document type: Papers
Conference/Event: Topical Problems of Fluid Mechanics 2019, Prague (CZ), 20190220
Year: 2019
Language: eng
Abstract: Quadrant analysis based on the Reynolds decomposition was performed on the data from turbulent boundary layer flows above variously rough surfaces. An estimation of a convective velocity for events significant in terms of momentum flux, and the statistics of a length and amplitude of the individual events, together with their spectral analysis, was performed. Based on the analyses, we were able to detect a few individual sweep and ejection events with a length longer than 6δ, which could be considered as very large scale motions (VLSM). We also identified number of events with a longitudinal dimension equal to approximately 3δ labelled as large scale motions (LSM). The analyses were executed for various Reynolds numbers. The number of detected structures increases with the momentum of the flow.
Keywords: large scale motion; quadrant analysis; wind tunnel
Project no.: GA15-18964S (CEP), GA18-09539S (CEP)
Funding provider: GA ČR, GA ČR
Host item entry: Proceedings of Topical Problems of Fluid Mechanics 2019, ISBN 978-80-87012-69-7, ISSN 2336-5781

Institution: Institute of Thermomechanics AS ČR (web)
Document availability information: Fulltext is available at external website.
External URL: http://www.it.cas.cz/fm2015/im/admin/showfile/data/my/Papers/2019/17-TPFM2019.pdf
Original record: http://hdl.handle.net/11104/0298407

Permalink: http://www.nusl.cz/ntk/nusl-399115


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