Design of a Swept Wing Model for the Investigation of Semi-Active Flutter Suppression in Transonic Flow

Kurzfassung

Experimental investigations of passive flutter-suppression concepts on realistic swept transonic wings require suitable benchmark configurations exhibiting a well-defined classical flutter mechanism. No such model was available for the DNW Transonic Wind Tunnel Göttingen (DNW-TWG). The present work therefore describes the numerical development of a new swept transonic benchmark wing intended for the experimental investigation of semi-active flutter suppression concepts. A hierarchical design workflow combining low-fidelity structural pre-design with high-fidelity CFD-based aeroelastic analyses was employed. The resulting configuration exhibits a classical flutter mechanism governed by the interaction of the second bending and first torsional modes together with a pronounced transonic dip within the operating envelope of the DNW-TWG. Good agreement is obtained between fully coupled nonlinear fluid--structure interaction simulations and the corresponding linearized frequency-domain flutter predictions. A first numerical investigation demonstrates that localized contour bumps can substantially increase the flutter boundary within the transonic dip while leaving the low-Mach-number behavior largely unaffected. The resulting benchmark provides the basis for the planned wind-tunnel campaign and constitutes a new validation case for CFD-based aeroelastic prediction methods.