The eigenvalues obtained from this new approach indicate whether the aeroelastic system is stable or unstable. A comparison of the results from this approach with those from existing flutter determination methods shows that the new approach predicts the correct flutter condition. It shows good agreement in flutter speed and flutter mode. It will allow the use of nonlinear, time-marching solvers in routine aeroelastic design analysis. Because of the modular nature of the numerical eigensystem solver, it can be readily adapted to other time-marching aeroelastic solvers with minimal additional effort required on the researchers' part.
All values are nondimensional.
Using Nonlinear, Time-Marching CFD Solvers. AIAA Paper 94-4396, 1994.