Sharp Asymptotics for KPP Pulsating Front Speed-up and Diffusion Enhancement by Flows
classification
🧮 math.AP
keywords
frontdiffusivityeffectiveenhancementflowspulsatingspeed-upasymptotics
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We study KPP pulsating front speed-up and effective diffusivity enhancement by general periodic incompressible flows. We prove the existence of and determine the limits $c^*(A)/A$ and $D(A)/A^2$ as $A\to\infty$, where $c^*(A)$ is the minimal front speed and $D(A)$ the effective diffusivity.
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