Application of the Doublet-Lattice Method to Nonplanar Configurations in Subsonic Flow

This paper presents a short survey of the more recent developments of the Vortex- and Doublet-Lattice Methods for calculating aerodynamic lift distributions on surfaces in steady and oscillatory motion at subsonic speeds. The methods are outlined and some computational details, not previously documented, are discussed. Correlations are shown for nonplanar configurations by comparing results with solutions obtained by other means, and with experimental data. The nonplanar configurations considered in steady and oscillatory motion include T-tails, wing-pylon combinations, annular wings, wing-fuselage combinations, and wings in ground proximity. The accuracy and versatility of the methods are demonstrated by the extensive correlations obtained on all configurations.