Abstract
We consider a class of second order elliptic problems on perforated domains with small holes of size \$\epsilon\delta\$, distributed periodically with the period \$\epsilon\$. A non homogeneous Neumann condition is prescribed on the boundary of some holes; on ehte bother of the other ones, it is a homogeneous Dirichlet condition that is considered. We are interested here to give the limit behaviour of the problems when \$\epsilon0\$ and \$= \$(\epsilon) 0\$. To do so, we apply the periodic unfolding method introduced in 5, that allows us to consider general operators with highly oscillating (with \$\epsilon\$) coefficients and rather general geometries.
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