The mechanism of sound generation in the downstream direction of jets is often associated with large-scale structures, or wavepackets. These are often modelled using frequency-domain models based on the linearisation of the Navier-Stokes system. A closed-loop control formulation requires a time-domain model in order to calculate appropriate gains between sensors and actuators so as to minimise a given objective. In the present work, we address how such a control scheme can be developed using time-domain transfer functions, derived from corresponding frequency-domain models. We first exemplify the application of the present technique for a simplified 1D problem based on the nonlinear Burgers' equation. The proposed method is then applied for time-domain transfer functions obtained using wave-packet models for jets, as an attempt to control large-scale structures in such flows and consequently reduce their sound radiation.
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