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The present study revisits the amplitude modulation phenomenon, specificallyfor the robustness in its quantification. To achieve this, a well-resolvedlarge-eddy simulation (LES) data set at Re_theta= 8200 is used. First, thefluctuating streamwise velocity signal is decomposed into its small- andlarge-scale components using both Fourier filters and empirical modedecomposition (EMD), allowing the comparison among different separationfilters. The effects of these filters on various definitions for quantifyingthe amplitude modulation have been discussed. False positive identification ofthe amplitude modulation has also been tested using a randomised signal.Finally, the impact of the inclination angle of the large-scale structures onthe modulation quantification has been assessed.

Revisiting the amplitude modulation in wall-bounded turbulence: towards a robust definition