Prediction of Trailing-Edge Noise Based on Reynolds-Averaged Navier–Stokes Solution

Trailing-edge noise is a significant component of the noise generated by low-Mach-number wall-bounded turbulent flow. It is therefore important to develop an efficient method for computing this noise in practical applications. Instead of using computationally expensive methods or an empirical model to predict the true time history of surface pressure, a model of trailing-edge noise for a hydrofoil combining widely used computational-fluid-dynamics Reynolds-averaged Navier–Stokes solutions with the edge source acoustic Green’s function of arbitrary chord is presented. The model takes the nature of the anisotropic turbulence in boundary-layer flow derived from Reynolds-averaged Navier–Stokes solution into consideration. The model has been applied to the trailing-edge noise of a NACA 0012 foil at a chord-based Reynolds number equal to 2.36×106 and to a strut with hemicylindrical leading edge and tapered trailing edge at Reynolds number equal to 5.12×105. It has been compared with existing empirical models, and a significant improvement has been obtained. The predicted results are in good agreement with existing experimental data.