Using the unsteady vortex lattice method based on potential flow theory, a rapid modeling approach is developed for aerodynamic computation of multi-lifting surfaces. Multiple lifting surfaces with different geometric parameters and grid divisions can be quickly integrated meshed object-oriented data structure. The physical influence between was modeled, wake–surface interaction also considered...

Improving aerodynamic models for adverse loss-of-control conditions in flight is an area being researched under the NASA Aviation Safety Program. Aerodynamic models appropriate for loss of control conditions require a more general mathematical representation to predict nonlinear unsteady behaviors. As more general aerodynamic models are studied that include nonlinear higher order effects, the p...

A variety of unsteady aerodynamic models for a twodimensional rigid plate undergoing pitching and plunging motion is present in the literature. For a two-dimensional flexible wing, unsteady forces are generated by the wing deflection in time. Hence the necessity of unsteady models that also take into account the flexible degrees of freedom of the wing. In the present work, the deflection of a f...

This paper identifies the unsteady aerodynamic forces and moments for a typical section contained in the NACA Report No. 496, “General Theory of Aerodynamic Instability and the Mechanism of Flutter,” by Theodore Theodorsen. These quantities are named Theodorsen’s aerodynamic forces (TAFs). The TAFs are compared to the generalized aerodynamic forces (GAFs) for a very high aspect ratio wing (AR =...