- Carlson, Henry A. and Feng, James Q. and Thomas, Jeffrey P. and Kielb, Robert E. and Hall, Kenneth C. and Dowell, Earl H., Computational models for nonlinear aeroelasticity,
43rd AIAA Aerospace Sciences Meeting and Exhibit - Meeting Papers
pp. 4143 - 4152 .
(last updated on 2007/04/10)
Two distinctly different reduced-order models are formulated for fully nonlinear aeroelastic systems. The first is based on Proper Orthogonal Decomposition (POD). The velocity field is decomposed into a finite number of orthonormal modes, effecting order reduction by transforming from physical space to a low-dimensional eigenspace. The second model is based on the method of Harmonic Balancing (HB). It retains the same physical dimensions of a high-order CFD model but transforms from the time domain to the frequency domain, requiring a single solution for each harmonic frequency included in the model. The number of harmonic frequencies is much smaller than the number of time steps required in a time-accurate simulation. Comparisons are made between POD and HB model output and experimental data for a set of canonical problems involving viscous effects, now separation, and fully nonlinear aeroelastic behavior: now past a stationary cylinder, a cylinder with forced oscillations, and a self-excited, plunging cylinder. Copyright © 2005 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.
Aerodynamics;Computational fluid dynamics;Harmonic generation;