Modeling aerodynamically generated sound of helicopter rotors

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Computational aeroacoustics: progress on nonlinear problems of sound generation (2004, methodology): “In other applications the accuracy of Kirchhoff-surface based predictions is observed to degrade when the surface in within the nonlinear flow region [54,58].”
Unstructured Large-Eddy Simulations of Supersonic Jets (2017, methodology): “The method has been successfully applied to a wide range of problems, including aircraft flyover and rotorcraft noise (see, for instance, the review by Brentner and Farassat [35]).”
COMPUTATIONAL PREDICTION OF FLOW-GENERATED SOUND (2006, methodology): “This approach, which essentially treats the FW-H method in the same way as the Kirchhoff method (Farassat & Myers 1988), has gained popularity in recent years because of computational efficiency (Brentner & Farassat 2003).”
An acoustic analogy formulation for moving sources in uniformly moving media (2011, background): “If the FW–H surface coincides with stationary solid boundaries, the flow velocity, u, is equal to the surface velocity v, which reduces the FW–H equation to Curle’s equation (cf. Howe 1998). The presence of both temporal and spatial derivatives with respect to the observer frame of reference may rai”