Smith, Tom A; Ventikos, Yiannis; (2022) A hybrid computational aeroacoustic model with application to turbulent flows over foil and bluff bodies. Journal of Sound and Vibration , 526 , Article 116773. 10.1016/j.jsv.2022.116773.

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Abstract

In this study, a versatile and general three-dimensional hybrid aeroacoustic model is presented for low Mach number turbulent flows. A dual-domain approach is adopted, with the fluid and acoustic fields being solved simultaneously on separate, partially overlapping grids. By solving both parts at the same time, the need to store large data sets is removed, which improves the efficiency and usability of the model. Incompressible large eddy simulations are used to resolve the flow field and compute the source terms, which are interpolated onto the acoustic domain using radial basis functions. The acoustic perturbation equations are then solved using a finite-volume Riemann-based solver. The model is validated using a series of cases involving transitional and turbulent flows over foil and bluff bodies. Trailing edge instability noise and rod-foil interaction noise are modelled, with the results being compared to a range of experimental sources. Excellent agreement is seen, demonstrating the robustness and accuracy of the method. The trailing edge studies also provide additional insights into the origin of secondary tones in the acoustic spectra.

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