DOUBLET-POINT METHOD FOR SUPERSONIC UNSTEADY AERODYNAMICS OF NONPLANAR LIFTING-SURFACES

A new method is devised for the calculation of pressures and aerodynamic influence-coefficients on nonplanar lifting-surface configurations oscillating in a supersonic freestream. The method is an extension of the methodology introduced in the planar supersonic doublet-point scheme, which is based upon the concept of concentrated lift forces and uses the acceleration potential doublet as an elementary solution of the wave equation. These features make the method capable of being incorporated in a unified code for both subsonic and supersonic speeds, as well as amenable to rapid aeroelastic calculations. Results on various lifting-surface configurations are in agreement with other supersonic oscillatory methods, validating the doublet-point approximation in nonplanar supersonic applications.