AN UNCOUPLED PROCEDURE FOR WING FLUTTER ANALYSIS

Flutter analysis of AGARD Wing 445.6 is performed with an uncoupled method. Unsteady modal aerodynamic loads are calculated with an unstructured Euler solver for the first four modes of the wing. ANSYS ® is used for modal analysis of the wing. Mode shapes and the modal pressure distributions are transferred between the structural code and the CFD code by surface interpolation. Nodal forces obtained from the pressure distributions are fitted a polynomial in terms of the reduced frequency. The resulting polynomial eigenvalue problem is solved for the flutter frequency. The results indicate that even a 2 nd order polynomial is adequate for flutter frequency prediction.