%0 Conference Proceedings %T Closed-loop drag reduction over a D-shaped body via Coanda actuation %+ Tafila Technical University %+ Technische Universität Braunschweig = Technical University of Braunschweig [Braunschweig] %+ Laboratoire d'Informatique pour la Mécanique et les Sciences de l'Ingénieur (LIMSI) %A Shaqarin, Tamir %A Oswald, Philipp %A Semaan, Richard %A Noack, Bernd %< avec comité de lecture %( Proceedings of the 5th Symposium on Fluid Structure-Sound Interactions and Control (FSSIC) %B 5th Symposium on Fluid Structure-Sound Interactions and Control (FSSIC) %C Minoa Palace - Resort, Chania, Crete island, Greece %8 2019-08-27 %D 2019 %K D-shaped body %K Closed-loop control %K Flow control %K Drag reduction %Z Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph]Conference papers %X Up to 40% drag reduction was achieved for a D-shaped cylinder in an experiment with robust model-based closed-loop control. The flow is actuated with on-off jet slots blowing in the stream-wise direction over the top and bottom edge. These jets are deflected inward with Coanda surfaces, thus realizing drag reduction by aerodynamic boat tailing. The flow state is monitored with pressure sensors at the trailing surface. The pressure fluctuation level is found to be closely related to drag. Starting point for control design is an optimized open-loop control, with a Strouhal number of 0.33 and duty cycle of 50%. Successful closed-loop drag reduction was achieved, in terms of improving output stability and enhancing performance in term of settling time. %G English %L hal-02398700 %U https://hal.science/hal-02398700 %~ CNRS %~ UNIV-PSUD %~ LIMSI %~ UNIV-PARIS-SACLAY %~ UNIV-PSUD-SACLAY %~ SORBONNE-UNIVERSITE %~ SORBONNE-UNIV %~ TEST-HALCNRS %~ LISN %~ GS-ENGINEERING %~ GS-COMPUTER-SCIENCE %~ COMUE-UPSACLAY %~ ALLIANCE-SU %~ TEST3-HALCNRS