Geodesic
Approximation of a system of singularly perturbed reaction-diffusion parabolic equations in a rectangle
Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 48 (2008) no. 4, pp. 660-673 
G. I. Shishkin; L. P. Shishkina. Approximation of a system of singularly perturbed reaction-diffusion parabolic equations in a rectangle. Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 48 (2008) no. 4, pp. 660-673. http://geodesic.mathdoc.fr/item/ZVMMF_2008_48_4_a9/
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Voir la notice de l'article provenant de la source Math-Net.Ru

The Dirichlet problem for a system of singularly perturbed reaction-diffusion parabolic equations in a rectangle is considered. The higher order derivatives of the equations are multiplied by a perturbation parameter $\varepsilon^2$, where $\varepsilon$ takes arbitrary values in the interval (0, 1]. When $\varepsilon$ vanishes, the system of parabolic equations degenerates into a system of ordinary differential equations with respect to $t$. When $\varepsilon$ tends to zero, a parabolic boundary layer with a characteristic width $\varepsilon$ appears in a neighborhood of the boundary. Using the condensing grid technique and the classical finite difference approximations of the boundary value problem, a special difference scheme is constructed that converges $\varepsilon$-uniformly at a rate of $O(N^{-2}\ln^2N+N_0^{-1})$, where $N=\min_s N_s$, $N_s+1$ and $N_s+1$ are the numbers of mesh points on the axes $x_s$ and $t$, respectively.

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