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Structural dissimilarity of large-scale structures in turbulent flows over wavy walls

Zenklusen, A; Kuhn, S; von Rohr, PR; (2012) Structural dissimilarity of large-scale structures in turbulent flows over wavy walls. Physics of Fluids , 24 (5) , Article 055112. 10.1063/1.4719778. Green open access

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Abstract

Turbulent flows over a wavy wall are investigated in channels with a wavy bottom and a flat top with different channel heights. Flow structures are determined from proper orthogonal decompositions of velocity fields measured with particle image velocimetry. Three different channel heights are considered, which are characterized by blockage ratios β (half channel height to wave amplitude ratio) 3.3, 6.7, and 10. Measurements are evaluated at comparable Reynolds numbers (Re) around 10 000. Structural similarity of large-scale structures, which is valid at β = 6.7 and 10, no longer holds at β = 3.3. Furthermore, characteristic regions of flows over wavy walls exhibit different locations in the case of the smallest channel height.

Type: Article
Title: Structural dissimilarity of large-scale structures in turbulent flows over wavy walls
Open access status: An open access version is available from UCL Discovery
DOI: 10.1063/1.4719778
Publisher version: http://dx.doi.org/10.1063/1.4719778
Language: English
Additional information: Copyright (2012) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in (citation of published article) and may be found at http://dx.doi.org/10.1063/1.4719778
Keywords: boundary layer turbulence, channel flow, decomposition, external flows, flow visualisation
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering
URI: http://discovery.ucl.ac.uk/id/eprint/1365891
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