Homogenization of a Boundary Obstacle Problem

Details Homogenization of a Boundary Obstacle Problem Homogenization of a Boundary Obstacle Problem

2010-05-06

arxiv.org/abs/1005.1094v1

Mathematics

Analysis of PDEs

19 pages, originally submitted for publication 24 February 2010.

Scientific paper

We prove the existence of a homogenization limit for solutions of appropriately formulated sequences of boundary obstacle problems for the Laplacian on $C^{1,\alpha}$ domains. Specifically, we prove that the energy minimizers $u_\epsilon$ of $\int |\nabla u_\epsilon|^2 dx$, subject to $u \geq \phi$ on a subset $S_\epsilon$, converges weakly in $H^1$ to a limit $\bar{u}$ which minimizes the energy $\int |\nabla \bar{u}|^2 dx + \int_\Sigma (u-\phi)_-^2 \mu(x) dS_x$, $\Sigma \subset \partial D$, if the obstacle set $S_\epsilon$ shrinks in an appropriate way with the scaling parameter $\epsilon$. This is an extension of a result by Caffarelli and Mellet, which in turn was an extension of a result of Cioranescu and Murat.

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