Abstract
To analyze the fundamental physical mechanism which determines the damping effect of a riblet surface on three-dimensional oblique transition numerical simulations of a spatial evolving zero-pressure gradient boundary layer above a clean and a riblet wall are performed. The laminar flow is excited by two oblique waves to force the oblique transition scenario. The occurring three-dimensional structures, i.e, Λ and streamwisely aligned vortices are found to be damped and their breakdown to turbulence is damped by the riblets compared to a clean surface. The investigation of the near-wall flow structures reveals secondary flows induced by the riblets.
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Klumpp, S., Meinke, M., Schröder, W. (2010). Numerical simulation of riblet controlled oblique transition. In: Schlatter, P., Henningson, D. (eds) Seventh IUTAM Symposium on Laminar-Turbulent Transition. IUTAM Bookseries, vol 18. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-3723-7_32
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DOI: https://doi.org/10.1007/978-90-481-3723-7_32
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