On the radiated noise computed by large-eddy simulation

This paper addresses the problem of the estimation of the noise radiated by forced isotropic turbulence using an hybrid large-eddy simulation/Lighthil l analogy approach. The scale separation associated with the LES approach l eads to splitting the acoustic source term as the sum of several contributi ons. The subgrid scale and high frequency contributions to radiated acousti c spectrum are first evaluated on the ground of filtered direct numerical s imulations. The parametrization of subgrid scale effects based on a scale s imilarity model is addressed. Both a priori and a posteriori tests demonstr ate the efficiency of the proposed model. (C) 2001 American Institute of Ph ysics.