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Reynolds-number scaling of a vorticity-Annihilating boundary layer

Kaiser, Frieder 1; Von Der Burg, Malte; Sommeria, Joël; Viboud, Samuel; Frohnapfel, Bettina 1; Gatti, Davide 1; Rival, David E.; Kriegseis, Jochen 1
1 Institut für Strömungsmechanik (ISTM), Karlsruher Institut für Technologie (KIT)


To mimic the unsteady vortex–wall interaction of animal propulsion in a canonical test case, a vorticity-annihilating boundary layer was examined through the spin-down of a vortex from solid-body rotation. A cylindrical, water-filled tank was rapidly stopped, and the decay of the vortex from solid-body rotation was observed by means of planar and stereo particle image velocimetry. High Reynolds-number (Re) measurements were achieved by combining a large-scale facility (diameter, D=13 m) with a novel approach to reduce end-wall effects. The influence of the boundary-layer formation at the tank's bottom wall was minimised by introducing a saturated salt-water layer. The experimental efforts have allowed us to assess the Re dependency of the laminar–turbulent transition of the vorticity-annihilating side-wall boundary layer at scales similar to large cetaceans. The scaling of the transition mechanism and its onset time were found to agree with predictions from linear stability analysis. Furthermore, the growth rate of the curved turbulent boundary layer was also in good agreement with an empirical scaling formulated in the literature for much smaller Re. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000137067
Veröffentlicht am 12.09.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Strömungsmechanik (ISTM)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 0022-1120, 1469-7645, 1750-6859
KITopen-ID: 1000137067
Erschienen in Journal of Fluid Mechanics
Verlag Cambridge University Press (CUP)
Band 924
Seiten 2100600
Nachgewiesen in Dimensions
Web of Science
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