Abstract
Large-eddy simulations are performed using high-fidelity numerical schemes developed for turbulence simulations and computational aeroacoustics to study near-ideally expanded and tone-producing supersonic jets vertically impinging on a large flat plate. The simulations compute the complex interaction of the supersonic jet with the flat impingement plane and directly provide the noise generated by this interaction. Two jet-operating temperatures, which correspond to isothermal and heated conditions, are considered in the simulations. The simulation results from both cases are examined to investigate the intense tonal noise generation arising from the jet impingement. The comparisons between the simulation results and the corresponding experimental measurements generally show a reasonable agreement and provide credibility to the quality of the simulation predictions. The simulations reveal important details about the problem of interest, which are not observable from the experiments. A dynamic mode decomposition is performed to identify the dynamically important modes of the supersonic impinging-jet flowfield for the simulated conditions. The most dominant mode of the flowfield is found to possess a temporal frequency that corresponds to the fundamental impingement tone frequency. Coherent nearly axisymmetric structures in the flowfield are also identified, which are generated at the fundamental impingement tone frequency.
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