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10:30
15 mins
EXPERIMENTAL INVESTIGATION OF TURBULENT BOUNDARY LAYER FLOW UNDERGOING SPANWISE TRAVELING TRANSVERSAL SURFACE WAVES
Dorothee Roggenkamp, Wenfeng Li, Wilhelm Jessen, Michael Klaas, Wolfgang Schröder
Session: Control 1
Session starts: Tuesday 25 August, 10:30
Presentation starts: 10:30
Room: Room D
Dorothee Roggenkamp (Institute of Aerodynamics, RWTH Aachen University)
Wenfeng Li (Institute of Aerodynamics, RWTH Aachen University)
Wilhelm Jessen (Institute of Aerodynamics, RWTH Aachen University)
Michael Klaas (Institute of Aerodynamics, RWTH Aachen University)
Wolfgang Schröder (Institute of Aerodynamics, RWTH Aachen University)
Abstract:
The influence of spanwise traveling transversal surface waves on the near-wall flow field of turbulent boundary layers with and without adverse pressure gradient is investigated by particle-image velocimetry (PIV) and micro-particle tracking velocimetry (μ-PTV). A detailed analysis of the velocity profile immediately downstream of the actuated surface shows a local drag decrease as well as an increase caused by the surface wave dependent on the wave parameters.