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Feedback shear layer control for bluff body drag reduction

  • MARK PASTOOR (a1), LARS HENNING (a1), BERND R. NOACK (a2), RUDIBERT KING (a1) and GILEAD TADMOR (a3)...

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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Corresponding author

Author to whom correspondence should be addressed: Mark.Pastoor@TU-Berlin.de

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Feedback shear layer control for bluff body drag reduction

  • MARK PASTOOR (a1), LARS HENNING (a1), BERND R. NOACK (a2), RUDIBERT KING (a1) and GILEAD TADMOR (a3)...

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