Abstract
Our previous studies [1] of thick axisymmetric turbulent boundary layers on long cylinders have shown that frequently-occurring negative spikes are a characteristic feature in the time-histories of the streamwise (u) velocity fluctuations, at all radial positions throughout the boundary layer. The spikes represent “spots” of low-speed fluid, which appear to consist of inner-layer fluid that has been stripped away from the cylinder surface by large-scale turbulent cross-flows within the boundary layer itself. We have postulated [1,2] that this stripping process may well play a significant role in turbulence generation and maintenance in thick axisymmetric boundary layers.
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References
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© 1993 Springer Science+Business Media Dordrecht
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Bull, M.K., Dekkers, W.A. (1993). Identification of Low-Speed Spots and Vortical Structures in the Wake of a Long Cylinder in Near-Axial Flow. In: Bonnet, J.P., Glauser, M.N. (eds) Eddy Structure Identification in Free Turbulent Shear Flows. Fluid Mechanics and Its Applications, vol 21. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-2098-2_10
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DOI: https://doi.org/10.1007/978-94-011-2098-2_10
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