Organized structures in turbulent jets can be modeled as wavepackets. These are
characterized by spatial amplification and decay, both of which are related to stability …

We consider the frequency domain form of proper orthogonal decomposition (POD), called
spectral proper orthogonal decomposition (SPOD). Spectral POD is derived from a space …

The directivity of noise from three large-eddy simulations of turbulent jets at Mach 0.7, 0.9,
and 1.5 is investigated using spectral proper orthogonal decomposition (SPOD). The most …

Response modes computed via linear resolvent analysis of a turbulent mean-flow field have
been shown to qualitatively capture characteristics of the observed turbulent coherent …

Streaks have been found to be an important part of wall-turbulence dynamics. In this paper,
we extend the analysis for unbounded shear flows, in particular a Mach 0.4 round jet, using …

Modelling the noise emitted by turbulent jets is made difficult by their acoustic inefficiency:
only a tiny fraction of the near-field turbulent kinetic energy is propagated to the far field as …

In this work we perform reactive control of stochastic disturbances in forced turbulent jets
based on destructive interference. The study is motivated by the success of recent studies in …

The present paper reports an investigation of the statistical properties of pressure
fluctuations in the near field of subsonic compressible jets. The data-base analyzed has …

Linear instability waves, or wavepackets, are key building blocks for the jet-noise problem. It
has been shown in previous work that linear models correctly predict the evolution of …

A model for sound generation by a jet in the vicinity of a flat plate, mimicking an exhaust jet
installed near an aircraft wing, is presented. An earlier model (Cavalieri et al. J. Sound Vib …