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Ottimizzazione progressiva per ugelli bi e tridimensionali


Autore: A. Dadone, B. Grossman

Collana: CA - 54 - L Aquila 1999

An efficient formulation for the robust design optimization of compressible fluid dynamic 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. The adjoint problem is 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 optimization, whereby a sequence of operations, containing a partially converged flow solution, followed by a partially converged adjoint solution followed by an optimization step is performed. Furthermore, the progressive optimization involves the use of progressively finer grids. This approach has been tested on inverse design problems involving two and three-dimensional transonic nozzles. The methodology is shown to be robust and highly efficient, with a converged design optimization produced in no more than the amount of computational work to perform from one to two flow analyses.

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