EXPERIMENTAL INVESTIGATION OF TURBULENT BOUNDARY LAYER FLOW UNDERGOING SPANWISE TRAVELING TRANSVERSAL SURFACE WAVES

etc15 Tracking Number 20

Presentation:
Session: Control 1
Room: Room D
Session start: 10:30 Tue 25 Aug 2015

Dorothee Roggenkamp   D.Roggenkamp@aia.rwth-aachen.de
Affifliation: Institute of Aerodynamics, RWTH Aachen University
Wenfeng Li   wf.li@aia.rwth-aachen.de
Affifliation: Institute of Aerodynamics, RWTH Aachen University
Wilhelm Jessen   w.jessen@aia.rwth-aachen.de
Affifliation: Institute of Aerodynamics, RWTH Aachen University
Michael Klaas   m.klaas@aia.rwth-aachen.de
Affifliation: Institute of Aerodynamics, RWTH Aachen University
Wolfgang Schröder   office@aia.rwth-aachen.de
Affifliation: Institute of Aerodynamics, RWTH Aachen University

Topics: - Control of turbulent flows, - Wall bounded flows

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.