Abstract
Implicit large-eddy simulation of flow (, ) over a full-span single-slotted flap is performed in an effort to understand the flow unsteadiness and noise generation around the slot of the flap. A high-frequency tonal noise is found to be radiated from the trailing edge of the main wing, and an intense low-frequency tone is detected in the pressure spectra. The instability mechanisms that produce the noise components are examined by phase averaging, autocorrelations, and proper orthogonal decomposition analysis. Results show that both of the tonal noise components are generated by a vortex-shedding mechanism.
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