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Feedback shear layer control for bluff body drag reduction

Published online by Cambridge University Press:  11 July 2008

MARK PASTOOR ,
LARS HENNING ,
BERND R. NOACK ,
RUDIBERT KING  and
GILEAD TADMOR
MARK PASTOOR*
Affiliation:
Berlin Institute of Technology ER2-1, Department of Process Engineering, Chair of Measurement and Control, Hardenbergstraße 36a, D-10623 Berlin, Germany
LARS HENNING
Affiliation:
Berlin Institute of Technology ER2-1, Department of Process Engineering, Chair of Measurement and Control, Hardenbergstraße 36a, D-10623 Berlin, Germany
BERND R. NOACK
Affiliation:
Berlin Institute of Technology MB1, Department of Fluid Dynamics and Technical Acoustics, Straße des 17. Juni 135, D-10623 Berlin, Germany
RUDIBERT KING
Affiliation:
Berlin Institute of Technology ER2-1, Department of Process Engineering, Chair of Measurement and Control, Hardenbergstraße 36a, D-10623 Berlin, Germany
GILEAD TADMOR
Affiliation:
Northeastern University, Department of Electrical and Computer Engineering, 440 Dana Research Building, Boston, MA 02115, USA
*
†Author to whom correspondence should be addressed: Mark.Pastoor@TU-Berlin.de
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Abstract

Drag reduction strategies for the turbulent flow around a D-shaped body are examined experimentally and theoretically. A reduced-order vortex model describes the interaction between the shear layer and wake dynamics and guides a path to an efficient feedback control design. The derived feedback controller desynchronizes shear-layer and wake dynamics, thus postponing vortex formation. This actuation is tested in a wind tunnel. The Reynolds number based on the height of the body ranges from 23000 to 70000. We achieve a 40% increase in base pressure associated with a 15% drag reduction employing zero-net-mass-flux actuation. Our controller outperforms other approaches based on open-loop forcing and extremum-seeking feedback strategies in terms of drag reduction, adaptivity, and the required actuation energy.

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Papers
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Journal of Fluid Mechanics , Volume 608 , 10 August 2008 , pp. 161 - 196
Copyright
Copyright © Cambridge University Press 2008

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