Asymmetric time correlations in turbulent shear flows

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 $R{e}_{\lambda }\approx 100$.

4 pages, 2 figures, Will be published as part of IUTAM meeting 2002