SNGR Method for Assessing Noise Induced by Flap Side-Edges

Conference poster, 2013

We investigated the stochastic noise generation and radiation (SNGR) method [1] for assessing acoustic performances of flap side-edges, with the assistance of FINE/Acoustics produced by NUMECA. The flap side-edges include the baseline configuration, and a configuration that is formed by attaching a noise-reduction facility onto the baseline configuration. In the SNGR method, the time-averaged field required by this method comes from a Reynolds-averaged Navier-Stokes (RANS) computation. The kinetic energy and dissipation rate are the basic variables for constructing a synthetic turbulent field on the basis of the stochastic method. This turbulent field transforms to the noise sources using the Lighthill acoustic analogy. After that, the noise radiation is computed in the frequency space using the boundary element method (BEM). Since FINE/Acoustics include packages for the SNGR method and BEM, it is an ideal choice for realizing the computational procedure. FINE/Acoustics is proven for its sufficient capability on predicting the flap side-edge noise.