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An idealized one-dimensional flame.
Choice of physical parameters and initial conditions is based on the study
of unsteady nonpremixed flames, in which the
initial data corresponds roughly to pure fuel in one portion of the
domain and pure oxidizer in the other (red and blue lines in figure).
In this example, the advection velocity is a time-modulated and periodic
function, the diffusivity is small, and the reaction rate is large;
the dynamics of the resulting system are concentrated in a thin, nonsteady
reaction zone or flamelet.
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