Lai, H. and Luo, K.H.
A three-dimensional hybrid LES-acoustic analogy method for predicting open-cavity noise
Applied Scientific Research, 79, (1), . (doi:10.1007/s10494-006-9066-y).
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A three-dimensional (3D) hybrid LES-acoustic analogy method for computational
aeroacoustics (CAA) is presented for the prediction of open-cavity noise. The method uses
large-eddy simulation (LES) to compute the acoustic source while the Ffowcs Williams-
Hawkings (FW-H) acoustic analogy is employed for the prediction of the far-field sound. As a
comparison, a two-dimensional (2D) FW-H analogy is also included. The hybrid method has
been assessed in an open-cavity flow at a Mach number of 0.85 and a Reynolds number of
Re=1.36×106, where some experimental data are available for comparison. The study has
identified some important technical issues in the application of the FW-H acoustic analogy
to cavity noise prediction and CAA in general, including the proper selection of the
integration period and the modes of sound sources in the frequency domain. The different
nature of 2D and 3D wave propagation is also highlighted, which calls for a matching
acoustic solver for each problem. The developed hybrid method has shown promise to be a
feasible, accurate and computationally affordable approach for CAA.
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