Flow-induced noise prediction using a RANS-BEM technique

Abstract

A hybrid RANS-BEM technique is applied to calculate the self-noise produced by low Mach number flow past a flat plate. The flow field and turbulence statistics of the flow over the flat plate is predicted using a two-dimensional Reynolds Averaged Navier-Stokes (RANS) simulation. A statistical noise model is used to process the mean velocity, turbulent kinetic energy and turbulent dissipation rate to predict the incident pressure on the flat plate. This incident field is then applied as a load to a three-dimensional boundary element method (BEM) model of the flat plate to predict the far-field sound. Turbulent flow past a flat plate is used to demonstrate the hybrid RANS-BEM technique. The flow has a Reynolds number based on chord Rec =2.0×105 and Mach number M =0.044. The far-field pressure predicted with the hybrid RANS-BEM technique compares favourably with experimental measurements from literature.