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Session: Wall-bounded flows 1
Session starts: Tuesday 25 August, 10:30
Presentation starts: 10:45
Room: Room I

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Woutijn Baars (University of Melbourne)
Krishna Talluru (University of Newcastle)
Nick Hutchins (University of Melbourne)
Ivan Marusic (University of Melbourne)

Abstract:
Large-scale structures in wall-bounded turbulent flows are known to exhibit a coupling with the small-scale energy in the flow. Besides a superposition of large-scale energy onto the near-wall dynamics, this coupling comprises an amplitude and frequency modulation of the small-scale fluctuations by the large-scale motions. In this work we use wavelet analysis to examine amplitude and frequency modulation. Albeit the wavelet-based approach for amplitude modulation condenses to analyses presented in earlier studies, the strength of the approach becomes evident from a convenient extension of the technique to extract local instantaneous frequency modulation. While discrete techniques were employed previously, an application of a continuous approach results in inherent advantages when phase lags between the large- and small-scale fluctuations in terms of amplitude and frequency modulation are investigated.