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arXiv 1602.05049math.AP
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无界区域上反应扩散系统的自相似快速反应极限

Self-similar fast-reaction limits for reaction-diffusion systems on unbounded domains

E. C. M. Crooks, D. Hilhorst

摘要:

我们提出了一个统一的方法来表征系统的快速反应极限的两个反应扩散方程,或一个反应扩散方程和一个常微分方程,在无界域上,激发的快速化学反应模型,其中一个或两个反应物(S)是移动的。对于适当的初始数据,四类问题的解均在快速反应极限$k \to \infty$中收敛到具有四种形式之一的自相似极限轮廓,具体取决于扩散的分量数量以及空间域是半条线还是整条线。对于固定的$k$,长时间收敛到这些相同的自相似配置文件也成立,由于Kamin的缩放参数。我们的研究结果概括了早期的工作Hilhorst,范德豪特和Peletier更广泛的一类问题,并提供了一个定量描述的渗透到另一种物质的快速反应和长时间的制度。

英文摘要:

We present a unified approach to characterising fast-reaction limits of systems of either two reaction-diffusion equations, or one reaction-diffusion equation and one ordinary differential equation, on unbounded domains, motivated by models of fast chemical reactions where either one or both reactant(s) is/are mobile. For appropriate initial data, solutions of four classes of problems each converge in the fast-reaction limit $k \to \infty$ to a self-similar limit profile that has one of four forms, depending on how many components diffuse and whether the spatial domain is a half or whole line. For fixed $k$, long-time convergence to these same self-similar profiles is also established, thanks to a scaling argument of Kamin. Our results generalise earlier work of Hilhorst, van der Hout and Peletier to a much wider class of problems, and provide a quantitative description of the penetration of one substance into another in both the fast-reaction and long-time regimes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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