Numerical Simulation of Riblet Controlled Spatial Transition

Stephan Klumpp (), Matthias Meinke and Wolfgang Schröder
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Stephan Klumpp: RWTH Aachen University, Institute of Aerodynamics

A chapter in High Performance Computing in Science and Engineering '09, 2010, pp 311-324 from Springer

Abstract: Abstract To analyze the fundamental physical mechanism which determines the damping effect of a riblet surface on three-dimensional transition several numerical simulations of spatial transition in a flat plate zero-pressure gradient boundary layer above a riblet wall are performed in this study. Two types of transition are investigated. The first type of transition, namely K-type transition, is induced by a dominant two-dimensional Tollmien-Schlichting (TS) wave and a weak spanwise disturbance. The second type of transition is purely excited by two oblique waves. The two-dimensional TS waves are found to be amplified by riblets, whereas three-dimensional structures, i.e., Λ-, hairpin, and streamwisely aligned vortices, are damped and their breakdown to turbulence is delayed compared to transition on a clean surface. The investigation of the near wall flow structure reveals secondary flows induced by the riblets and reduced wall normal ejections as well as a reduced downwash. Overall, especially the oblique transition is delayed by the riblets.

Keywords: Drag Reduction; Spatial Transition; Clean Surface; Hairpin Vortex; Oblique Wave (search for similar items in EconPapers)
Date: 2010
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Persistent link: https://EconPapers.repec.org/RePEc:spr:sprchp:978-3-642-04665-0_23

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DOI: 10.1007/978-3-642-04665-0_23

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