Nonlinear Sciences – Pattern Formation and Solitons
Scientific paper
2006-12-11
Nonlinear Sciences
Pattern Formation and Solitons
accepted for publication by SIAM Journal on Applied Mathematics
Scientific paper
The wavefronts associated with a one-dimensional combustion model with Arrhenius kinetics and no heat loss are analyzed within the high Lewis number perturbative limit. This situation, in which fuel diffusivity is small in comparison to that of heat, is appropriate for highly dense fluids. A formula for the wavespeed is established by a non-standard application of Melnikov's method and slow manifold theory from dynamical systems, and compared to numerical results. A simple characterization of the wavespeed correction is obtained: it is proportional to the ratio between the exothermicity parameter and the Lewis number. The perturbation method developed herein is also applicable to more general coupled reaction-diffusion equations with strongly differing diffusivities. The stability of the wavefronts is also tested using a numerical Evans function method.
Balasuriya Sanjeeva
Gottwald Georg A.
Hornibrook J.
Lafortune Stephane
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