Kinetic decomposition for periodic homogenization problems

Details Kinetic decomposition for periodic homogenization problems Kinetic decomposition for periodic homogenization problems

2006-11-21

arxiv.org/abs/math/0611625v1

Mathematics

Analysis of PDEs

Scientific paper

We develop an analytical tool which is adept for detecting shapes of oscillatory functions, is useful in decomposing homogenization problems into limit-problems for kinetic equations, and provides an efficient framework for the validation of multi-scale asymptotic expansions. We apply it first to a hyperbolic homogenization problem and transform it to a hyperbolic limit problem for a kinetic equation. We establish conditions determining an effective equation and counterexamples for the case that such conditions fail. Second, when the kinetic decomposition is applied to the problem of enhanced diffusion, it leads to a diffusive limit problem for a kinetic equation that in turn yields the effective equation of enhanced diffusion.

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