Scalar fluctuation and its dissipation in turbulent reacting flows

The dissipation rate of a scalar variance is related to the mean heat release in turbulent combustion. Mixture fraction interest for non-premixed combustion, and reaction progress variable relevant premixed A great deal work conducted past studies understand spectra passive transport flows. very brief summary these bring out salient characteristics spectrum given first. Then, classical analysis reactive revisited lights recent understanding gained through analyzing deduced from direct numerical simulation data both shows that spectral density combustion has dependence on Karlovitz Damköhler numbers, which comes appearing expression. In scale shown be order chemical length scale, not influenced by scales inertial-convective range unlike rate. fluctuations produced near cascade exponentially larger scales. These observations imply models cannot extended