Axisymmetric superdirectivity in subsonic jets

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Scattering of wavepackets by a flat plate in the vicinity of a turbulent jet (2012, unknown): “Further modelling work based on wave-packet models developped for the free-jet case[1, 8], but with the tailored Green’s function to account for scattering by the plate, is underway.”
Importance of the nozzle-exit boundary-layer state in subsonic turbulent jets (2018, unknown): “Definitions Following the procedure described by Cavalieri et al. (2012), the coefficients of the azimuthal Fourier series for the far-field pressure p̂ are given by p̂(x, r,m, f )= 1 2π ∫ π −π p̂(x, r, θ, f )eimθ dθ, (C 1) and the reconstruction of the complex pressure is p̂(x, r, θ, f )=…”
Wave Packets and Turbulent Jet Noise (2013, methodology): “…30 40 50 60 70 80 90 Figure 3 The azimuthal structure of the sound due to Jm(2π St M sin φ) (a) as a function of frequency and azimuthal mode number for φ = 30, (b) as a function of St M sin φ, and (c) as measured experimentally at St = 0.2 (Cavalieri et al. 2012a).”