Large-eddy simulation of trailing-edge aeroacoustics

Abstract

A large-eddy simulation is performed for turbulent boundary layer flows past an asymmetrically beveled trailing-edge of a flat strut at a chord Reynolds number of 2.15 x 106. The computed velocity and surface pressure statistics compare reasonably well with the experimental measurements of Blake (1975). The far-field acoustics is calculated using the integral solution to the Lighthill equation derived by Ffowcs Williams and Hall (1970). Computations are carried out to determine the far-field noise spectra, the source-term characteristics, and the requirement for the integration domain size. It is found that the present simulation is adequate for predicting noise radiation over a wide frequency range. At the low frequency end, however, the spanwise source coherence estimated based on surface pressure fluctuations does not decay sufficiently, suggesting the need for a wider computational domain.