A multivariable closed-loop active flow control strategy to reduce the drag coefficient and yaw moment of a 3-dimensional bluff body is presented and applied in wind tunnel experiments. The relevant flow characteristics are investigated and discussed for several cross-wind angles from 0° to 10° at Reynolds numbers from 300000 to 500000. Dynamic black-box models are identified from experimental data and a robust multivariable H_∞-controller is synthesized using the mixed-sensitivity loop-shaping approach. The controller's capability to reduce the drag coefficient by more than 22 % corresponding to net power savings of about 15 % as well as its performance to suppress disturbances of the yaw moment during cross-wind gusts are demonstrated in experiments.
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