ABSTRACT
The evolution of the shape optimal design (OD) is related to the improvement of its two stages. The first is of the start solutions: from the reinforced, hyperbolical, potential solutions, to zonal, spectral solutions of the boundary layer partial differential equations (PDE). The second is of the optimization strategy itself: from the inviscid aerodynamic OD of the shape of the flying configuration with given planform, to the global optimization (including also the optimization of the planform similarity parameters) and from inviscid to viscous aerodynamic OD. The inviscid OD-shape of the integrated wing-fuselage (IWF) is the first step in the iterative viscous shape optimization process. In the second step of optimization, the predicted inviscid optimized shape of the IWF is corrected by also including these additional auxiliary conditions in the variational problem and the friction drag coefficient in the drag functional.
