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An approximation method based on Proper Orthogonal Decomposition (POD) is used for the storage of the primal flow fields, needed during the solution of the unsteady adjoint equations in aerodynamic optimization problems. Here, without loss in generality, the presentation is restricted to flow control optimization; its extension to aerodynamic shape optimization is straightforward. In this paper, the use of the POD, as an alternative to full storage or the check-pointing technique to supportdoi:10.5281/zenodo.823130 fatcat:chklahn7gzchnajgxiiazffxli