Thin front propagation in random shear flows

Details Thin front propagation in random shear flows Thin front propagation in random shear flows

2005-07-25

arxiv.org/abs/nlin/0507052v1

Phys. Rev. E 73, 016308 (2006)

Nonlinear Sciences

Chaotic Dynamics

5 Revtex4 pages, 4 figures included

Scientific paper

10.1103/PhysRevE.73.016308

Front propagation in time dependent laminar flows is investigated in the limit of very fast reaction and very thin fronts, i.e. the so-called geometrical optics limit. In particular, we consider fronts evolving in time correlated random shear flows, modeled in terms of Ornstein-Uhlembeck processes. We show that the ratio between the time correlation of the flow and an intrinsic time scale of the reaction dynamics (the wrinkling time $t_w$) is crucial in determining both the front propagation speed and the front spatial patterns. The relevance of time correlation in realistic flows is briefly discussed in the light of the bending phenomenon, i.e. the decrease of propagation speed observed at high flow intensities.

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