Asymmetric time correlations in turbulent shear flows
Bruno Eckhardt, Arne Jachens, Jörg Schumacher
Abstract
Cross correlations between normal and downstream velocity fluctuations in a turbulent shear flow are shown to carry information about the non-normal amplification process. The creation of spanwise modulated streaks by downstream vortices implies an asymmetry in temporal correlation functions. We verify this in numerical simulations in shear flows with Reλ≈ 100.
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