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NUMERICAL SIMULATION OF RIBLET CONTROLLED TRANSITION

Stephan Klumpp
Institute of Aerodynamics, RWTH Aachen University Wullnerstrasse 5a, 52062 Aachen, Germany

Matthias Meinke
Aerodynamisches Institut, RWTH Aachen, Wullnerstrasse zw. 5 und 7, D-52062 Aachen, Germany

Wolfgang Schroder
Institute of Aerodynamics RWTH Aachen University Wullnerstr. 5a, 52062 Aachen, Germany

Resumo

To investigate the impact of riblets aligned in the main flow direction on laminar-turbulent transition large-eddy simulations (LES) of spatially evolving flat plate zero-pressure gradient boundary layer are performed. By superimposed disturbances on the Blasius velocity profile at the inflow boundary natural K-type transition is triggered. A clean surface configuration and two riblet surface configurations are investigated. The two-dimensional Tollmien-Schlichting (TS) waves are found to be amplified by the riblets, whereas three-dimensional disturbances are damped. Secondary flow structures induced by the riblets are found. Overall, transition to turbulence is delayed by the riblets.