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TOLLMIEN-SCHLICHTING WAVE CANCELLATION USING AN OSCILLATING LORENTZ FORCE

Thomas Albrecht
Department of Magnetohydrodynamics Helmholtz-Zentrum Dresden-Rossendorf Bautzner Landstr. 400, 01328 Dresden, Germany; Department of Mechanical and Aerospace Engineering Monash University VIC 3800, Australia

Hans Metzkes
Institut fur Stromungsmechanik Technische Universitat Dresden 01062 Dresden, Germany

Roger Grundmann
Instiute of Aerospace Engineering, Technische Universitat Dresden, Mommsenstr., 13, 01062 Dresden, Germany

Gerd Mutschke
MHD Department, Institute of Safety Research, Forschungszentrum Dresden-Rossendorf P.O. Box 51 01 19, D-01314 Dresden, Germany

Gunter Gerbeth
MHD Department, Institute of Safety Research, Forschungszentrum Dresden-Rossendorf P.O. Box 51 01 19, D-01314 Dresden, Germany

Abstract

Using 2-D and 3-D Direct Numerical Simulations, we present results of Tollmien-Schlichting (TS) wave cancellation in a flat plate boundary layer, where the initial TS wave is supposed to be cancelled out by a secound wave of same amplitude, but 180° phase shifted. Considering low electrically conductive fluids like seawater, an oscillating Lorentz force is used to generate the counter-phased wave. Although the Lorentz force, hence the counter-phased wave, are inhomogeneous in spanwise direction, the remaining wave amplitude is reduced by more than 90% compared to the uncontrolled case.