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Progetto fluidodinamico 2D mediante ottimizzazione progressiva


Autore: A. Dadone

Collana: CA - 53 - Firenze 1998

An efficient formulation for the robust inverse and direct design of compressible fluid flow problems is presented. The methodology has three essential ingredients. First, the procedure permits the use of highly accurate flow solvers. Second, accurate and efficient design sensitivities are obtained using a discrete adjoint formulation, based on a dissipative flow solver in order to obtain robust sensitivity derivatives in the presence of noisy or non-smooth objective functions. The third ingredient of the procedure involves a progressive optimisation, whereby the flow solution and the design problem progressively converge to the optimised solution. Moreover, progressively finer grids are employed. The need of the dissipative flow solver is demonstrated with reference to the quasi one- dimensional continuous adjoint formulation. The suggested approach has been tested on several inviscid, two-dimensional channel and airfoil flow inverse design problems and on an airfoil direct design problem in transonic flow conditions. The methodology is shown to be accurate, robust and highly efficient, with a converged design optimisation produced in no more than the amount of computational work to perform from one to three flow analyses.

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