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arXiv 0905.4250math.AP
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流动对反应扩散前沿速度的增强作用

Reaction-Diffusion Front Speed Enhancement by Flows

Andrej Zlatos

摘要:

本文研究了流动引起的反应扩散方程脉动波前速度的增强和流体流动引起的反应猝灭。我们证明,在两个维度和任何燃烧型反应的周期性流动,前端速度是成正比的(均匀化)的有效扩散系数的平方根的流量。我们表明,这一结果并不成立,在三维和更多的维度。我们还证明了来自[1,3,11]的关于胞元流的解,关于波前加速率和初始数据为固定(大)尺寸时淬灭解所需的最小流幅

英文摘要:

We study flow-induced enhancement of the speed of pulsating traveling fronts for reaction-diffusion equations, and quenching of reaction by fluid flows. We prove, for periodic flows in two dimensions and any combustion-type reaction, that the front speed is proportional to the square root of the (homogenized) effective diffusivity of the flow. We show that this result does not hold in three and more dimensions. We also prove conjectures from [1,3,11] for cellular flows, concerning the rate of speed-up of fronts and the minimal flow amplitude necessary to quench solutions with initial data of a fixed (large) size

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