P. LUCHINI

In this paper we propose a new method to solve the optimal control problem in which the feedback matrix K is computed in an efficient way for complex flows, with large number of degrees of freedom, using an approach similar to adjoint-based control optimization. The idea is to consider the direct-adjoint system as an input-output problem where...

Linear stability analysis of flat plate boundary layers implies, for wave like perturba- tions, to solve the so called Orr-Sommerfeld equations which solution can be expressed in terms of a continuous, and discrete spectrum. As the number of discrete modes change with the Reynolds number, and further seem to disappear behind the continuous...

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In this paper we review the problem of the wake-flow stability for a thin airfoil by using both a locally plane-wave analysis, based on a WKBJ approximation, and a global numerical stability analysis. The core of the instability is further localized by performing a structural sensitivity analysis of the linearized Navier-Stokes operator as...