The active control of fully developed turbulent flows is of particular interest for many industrial applications. In such flow fields, the large-scale coherent structures contain most of the turbulent kinetic energy and are mainly responsible for vibrations, noise generation, etc... Therefore, in term of control, it seems important to describe correctly the characteristics of these structures and to predict precisely their time evolution using models as simple as possible. One of the methods proposed to mimic the dynamics of the flow is to develop low-order dynamical systems (Aubry et al., 1988) (Glauser et al., 1989) derived from the Proper Orthogonal Decomposition (POD) (Lumley, 1967; Sirovich, 1987).
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