2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/132920We 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.11ppAnalysis of PDEs35K57; 35B27text