CFD-Based Aeroelastic Eigensolver for the Subsonic, Transonic, and Supersonic Regimes

Abstract

We describe a linearized computational e uid dynamics (CFD) method for computing an arbitrary number of eigensolutions of a given aeroelastic problem. The proposed method is based on the reengineering of a three-way coupled formulation previously developed for the solution in the time domain of nonlinear transient aeroelastic problems. It is applicable in the subsonic, transonic, and supersonic e ow regimes, and independently from the frequency or damping level of the target aeroelastic modes. It is based on the computation of the complex eigensolution of a carefully linearized e uid ‐structure interaction problem, relies on the inverse orthogonal iteration algorithm, and reutilizes existing unsteady e ow solvers. This is a validated method with the e utter analysis of the AGARD Wing 445.6 for which experimental data are available.