Acoustic resonance in the potential core of subsonic jets

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Aeroacoustic resonance and self-excitation in screeching and impinging supersonic jets – A review (2019, background): “Amongst the most significant findings of the studies of Towne et al.,178 Schmidt et al.,177 and Jordan et al.179 were the existence of heretofore undiscovered “trapped” acoustic modes within the jet core that treat the jet like a soft-walled duct.”
Importance of the nozzle-exit boundary-layer state in subsonic turbulent jets (2018, background): “Schmidt et al. (2017) and Towne et al. (2017) recently identified and explained a new class of acoustic waves that are trapped within the potential core of subsonic jets.”
Upstream-travelling acoustic jet modes as a closure mechanism for screech (2018, methodology): “While there have been attempts to produce frequency prediction models that can account for staging (Gao & Li 2010), or to explain the process in terms of changes in characteristic length scales of the flow (Edgington-Mitchell, Honnery & Soria 2015b), a clear phenomenological explanation has not been”