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/Lighthill analogy approach. The scale separation associated with the LES approach leads to splitting the acoustic source term as the sum of several contributions. The subgrid scale and high frequency contributions to radiated acoustic spectrum are first evaluated on the ground of filtered direct numerical simulations. The parametrization of subgrid scale effects based on a scale similarity model is addressed. Both a priori and a posteriori tests demonstrate the efficiency of the proposed model. (C) 2001 American Institute of Physics.