| The most widely used method for flutter certification is based on the linearized aerodynamic potential theory, specifically, the Doublet-Lattice Method (DLM). However, this method fails to accurately predict the aeroelastic behaviour in the transonic regime.; The present work investigates two different approaches which are able to capture the nonlinearities in the transonic regime: (1) performing a time marching simulation using Euler and Navier-Stokes equations; and (2) correcting the DLM aerodynamic data in a frequency domain analysis using Computational Fluid Dynamics (CFD) results. A flutter analysis of the AGARD 445.6 wing was subsequently conducted using the time marching and DLM correction approaches.; Various frequency domain correction techniques were considered within the present work resulting in the selection of an unsteady pressure matching method, based on a downwash weighting approach. Unsteady pressures employed for this technique were obtained from Euler and Navier-Stokes CFD simulations undergoing a rigid body pitching motion. |
