Computational aeroacoustic analysis of slat trailing-edge flow

An acoustic analysis based on the Ffowcs Williams and Hawkings equation (Ff owcs Williams, J. E,, and Hawkings, D. L,, "Sound Generated by Turbulence a nd Surfaces in Arbitrary Motion," Philosophical Transactions of the Royal S ociety of London, Vol. A264, No. 1151, 1969, pp, 321-342) was performed for a high-lift system. As input, the acoustic analysis used unsteady how data obtained from a highly resolved, time-dependent, Reynolds-averaged Navier- Stokes calculation. The analysis strongly suggests that vortex shedding fro m the trailing edge of the slat results in a high-amplitude, high-frequency acoustic signal similar to that which was observed in a corresponding expe rimental study of the high-lift system.