The effect of wavy leading edges on aerofoil-gust interaction noise

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Airfoil noise reductions through leading edge serrations (2015, methodology): “[5] have investigated the effects of wavy leading edges on aerofoil-gust interaction noise.”
Performance and mechanism of sinusoidal leading edge serrations for the reduction of turbulence–aerofoil interaction noise (2017, background): “Lau et al. (2013) found from numerical simulations that significant noise reductions were achieved when the ratio between the leading edge amplitude to the gust wavelength exceeds approximately 0.3.”
On the reduction of aerofoil–turbulence interaction noise associated with wavy leading edges (2016, methodology): “It is shown in figure 7 that the relative reduction of ATI noise in decibels increases with the amplitude of the WLE profile in an almost linear fashion, which has also recently been observed experimentally by Narayanan et al. (2015) and numerically by Lau et al. (2013).”