2010 | OriginalPaper | Buchkapitel
LES of Riblet Controlled Temporal Transition of Channel Flow
verfasst von : S. Klumpp, M. Meinke, W. Schröder
Erschienen in: Progress in Turbulence III
Verlag: Springer Berlin Heidelberg
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Numerical investigations of the impact of riblets on natural transition in a temporal evolving channel flow have been performed. A set of riblet geometries are used for two different Reynolds numbers. The results show that transition is accelerated by all riblets compared with a smooth surface. This acceleration is caused by an amplification of the two-dimensional Tollmien-Schlichting (TS) waves by riblets, where the amplification magnitude dependeds on the specific geometry of the riblets.