%0 Journal Article
%T Prediction of ducted diaphragm noise using a stochastic approach with adapted temporal filters
%A Carlo Sovardi
%A Christophe Schram
%A Ugur Karban
%A Wolfgang Polifke
%J International Journal of Aeroacoustics
%@ 2048-4003
%D 2019
%R 10.1177/1475472X18812811
%X The noise production by ducted single- and double-diaphragm configurations is simulated using a stochastic noise generation and radiation numerical method. The importance of modeling correctly the anisotropy and temporal de-correlation is discussed, based on numerical results obtained by large eddy simulation. A new temporal filter is proposed, designed to provide the targeted spectral decay of energy in an Eulerian reference frame. An anisotropy correction is implemented using a non-linear model. The acoustic propagation problem is solved using LighthillĄ¯s aeroacoustic analogy with a tailored GreenĄ¯s function obtained analytically. Comparison with scale--resolved data indicates that accurate far-field noise predictions are obtained for both single and double diaphragm configurations, with computational costs significantly reduced with respect to the scale-resolved approach. A grouping scheme for the noise sources based on the octree structure is introduced to minimize the memory requirements and further reduce the computational cost
%K Stochastic noise generation and radiation method
%K aeroacoustic analogies
%K duct acoustics
%K tailored GreenĄ¯s function
%K large eddy simulation
%U https://journals.sagepub.com/doi/full/10.1177/1475472X18812811