Simulation and Analysis of Mixing in Two-Dimensional Turbulent Flows Using Fourier and Wavelet Techniques
This paper presents direct numerical simulations of mixing of passive and reactive scalars in two-dimensional flows. By means of pseudo-spectral methods the governing equations are numerically integrated. As an application we study a temporally growing mixing layer where we focus on the role of coherent vortices. Wavelet techniques are applied to obtain local spectral information about vorticity and scalars. We show that the local generation of fine scales in shear zones is strongly correlated with locally enhanced mixing. Furthermore, we examine the influence of chemical reactions.
KeywordsShear Zone Direct Numerical Simulation Fine Scale Fourier Spectrum Wavelet Spectrum
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