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Mixing in two‐dimensional turbulent reactive flows

Enhanced transport and mixing of scalars in turbulent flows are of major importance, in particular, when chemical time scales are smaller or of the same order as the the mixing time. We present direct numerical simulation of the mixing of passive and reactive scalars in two‐dimensional flows dominated by coherent vortices These organized structures have a significant impact on the mixing dynamics in turbulence. By means of a Fourier‐pseudospectral method the instationary equations are numerically integrated. To quantify the mixing, we consider statistical properties, i.e. the variance decay and histograms to approximate the probability density functions of the scalars. Also, the influence of a chemical reaction on mixing are investigated.