An jet of fully expanded Mach number 𝑀 𝑗 = 1.15 and Reynolds number 𝑅𝑒 = 1.25 × 10 6 issues from a contoured converged axisymmetric sonic nozzle operated under-expanded. Large eddy simulations by OpenFOAM software model the unsteady jet. The shock cell train in the jet plume is captured by a modified Roe approximate Riemann solver. Shock-associated noise and mixing noise radiate to the acoustic far-field. The far-field noise directivity and spectral content are predicted by the Ffowcs Williams and Hawkings acoustic analogy implemented in libAcoustics in OpenFOAM. The aerodynamic and acoustic predictions compare favourably with published numerical predictions and experiments. This provides confidence in the use of OpenFOAM combined with libAcoustics for studying the flow and noise from high speed jets towards identifying more effective, economical, and sustainable methods of high speed jet noise abatement and control at source.

Acoustic streaming (AS) is a steady fluid flow driven by the absorption of high amplitude ultrasonic vibrations due to the nonlinear effect. With potential applications in micro-pumping, the AS-related behaviors remain as interesting topics to the acoustic community. Anti-symmetric flexural (ASF) modes are wedge waves with their particle motion anti-symmetric about the apex mid-plane. With the energy tightly confined near the wedge-tip, ASF mode has relatively high acoustic amplitude which suggest it's as a good candidate for the investigation of AS. In this study, the AS behaviors induced by ASF modes are investigated by computational fluid dynamics (CFD). The ASF induced three-dimensional AS flow field are presented through the CFD analysis.