Learning from Dolphin Skin – Drag Reduction by Active Delay of Transition: Flow Control by Distributed Wall Actuation

  • Nikolas Goldin
  • Rudibert King
Part of the Notes on Numerical Fluid Mechanics and Multidisciplinary Design book series (NNFM, volume 119)


Control strategies for laminar flow control above a surface are investigated. A flexible membrane displaced by multiple piezo-polymer composite elements is used as actuator in wind-tunnel experiments. Direct methods of damping Tollmien-Schlichting waves are compared to a biomimetic approach imitating the dampingmechanisms of a compliant skin. In both cases, model predictive control algorithms are applied to control the multi-bar actuator segments. For the biomimetic approach, reduced models of compliant surfaces are developed and parametrized by direct optimization and according to numerically generated optimal wall properties. Damping results of up to 85% RMS value are achieved.


Root Mean Square Wave Packet Model Predictive Control Wall Model Displacement Velocity 
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Copyright information

© Springer Berlin Heidelberg 2012

Authors and Affiliations

  1. 1.Fachgebiet Mess-und RegelungstechnikTU BerlinBerlinGermany

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