Supersonic jets, particularly shock-containing jets, often exhibit high-intensity, discrete-
frequency acoustic tones. These tones are the signature of an aeroacoustic resonance loop …

Turbulent jet noise is a controversial fluid mechanical puzzle that has amused and
bewildered researchers for more than half a century. Whereas numerical simulations are …

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

Informed by large-eddy simulation (LES) data and resolvent analysis of the mean flow, we
examine the structure of turbulence in jets in the subsonic, transonic and supersonic …

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 study the velocity fields of unforced, high Reynolds number, subsonic jets, issuing from
round nozzles with turbulent boundary layers. The objective of the study is to educe …

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 …

We use input-output analysis to predict and understand the aeroacoustics of highspeed
isothermal turbulent jets. We consider axisymmetric linear perturbations about Reynolds …

We present experimental results for the acoustic field of jets with Mach numbers between
0.35 and 0.6. An azimuthal ring array of six microphones, whose polar angle,, was …

Gudmundsson and Colonius (J. Fluid Mech., vol. 689, 2011, pp. 97–128) have recently
shown that the average evolution of low-frequency, low-azimuthal modal large-scale …