AIAA Paper 2009-3629. Presented at the 27th AIAA Applied Aerodynamics Conference, June 22, 2009, pages 1-12. This article is in the public domain. Published by American Institute of Aeronautics and Astronautics.
NOTE: At the time of publication, the author Russell M. Cummings was on sabbatical leave from Cal Poly.
Recent advances towards an efficient computational method for accurately determining the stability and control characteristics of an aircraft are discussed and critiqued. The present approach with greatest promise is to reduce the number of high-fidelity CFD simulations by using Volterra functions Reduced Order Modeling. This type of reduced order model is a predictive model which has a unique training maneuver -a unit impulse. The advantage of such an approach is the fast prediction of the aerodynamic characteristics of an aircraft. This article presents the results of application of the Volterra functions ROM for prediction of linear movement of a 2D airfoil and of an X-31 aircraft model. The Volterra ROM predicted well normal and axial force which are linear or weakly non-linear and was in a fairly good agreement with pitching moment as long as the pitching moment predictions were weakly non-linear.