Abstract
The dynamics of a plane mixing layer as well as its noise production are investigated through a global mode decomposition of the linearized simulation and its nonlinear generalization called Koopman mode. Through the projection of the shear layer dynamics onto a set of Koopman modes, we demonstrate its significant efficiency in capturing the nearand far-field behaviours of instability waves. In particular, the Koopman mode associated with the first subharmonic is dominant in the acoustic radiation of the underlying flow dynamics. Within the Koopman mode decomposition framework, the sound generation mechanism is reinterpreted as a linear combination of the nonlinear modes resulting from the Koopman operator.
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