CONSTRAINED OPTIMIZATION OF NACELLE SHAPES IN EULER FLOW USING SEMIANALYTICAL SENSITIVITY ANALYSIS

The problem of aerodynamic shape optimization in Euler flow is address ed. B-splines are used for parametrization of the shape. Cheap gradien t calculation is obtained via sensitivity analysis and the solution of an adjoint equation; pseudo second-order spatial accuracy is achieved by means of a semianalytical formulation. As a validation of the appr oach, several inverse and constrained optimization test problems are p resented with emphasis on civil engine nacelle design. The handling of nondifferentiable quantities (such as maxima) in cost functions is al lowed for via the use of the Kreisselmeier-Steinhauser function.