Wavelet CrossCorrelation Analysis of Turbulent Mixing from LargeEddySimulations.pdf

0 0 0 Wavelet Cross-Correlation Analysis of 2 r Turbulent Mixing from a M Large-Eddy-Simulations 4 1 S. Sello and J. Bellazzini ] n Enel Research y d A. Pisano 120, Pisa 56122, ITALY - u Contact e-mail: sello@pte.enel.it l f . s c 1 Introduction i s y The complex interactions existing between turbulence and mixing in a bluff- h body stabilised flame configuration is investigated by means of a wavelet cross- p [ correlation analysis on Large Eddy Simulations. The combined approach allows to better point out typical features of unsteady turbulent flows with mixing 1 through the characterisation of the processes involved both in time and scales. v 9 The wavelet cross-correlation analysis of the time signals of velocity and mixture 2 fraction fluctuations can be an an effective tool to study the processes involved 0 in turbulent mixing flows which are of great interest in combustion problems. 3 0 0 2 Generalities on wavelet cross-correlation 0 / s The continuous wavelet transform of a function f (t) is defined as the convolution c i between f and a dilated function called wavelet mother: s y 1 +∞ ∗ t − τ √ h W (a, τ ) = f (t) ( )dt, (1) f a a p