Derivation of Darcy's law in randomly punctured domains

Arianna Giunti

Published 2021-01-04Version 1

We consider the homogenization of a Poisson problem or a Stokes system in a randomly punctured domain with Dirichlet boundary conditions. We assume that the holes are spherical and have random centres and radii. We impose that the average distance between the balls is of size $\eps$ and their average radius is $\varepsilon^{\alpha}$, $\alpha \in (1; 3)$. We prove that, as in the periodic case [G. Allaire, ``Homogenization of the Navier-Stokes equations in domains perforated with tiny holes. II''], the solutions converge to the solution of Darcy's law (or its scalar analogue in the case of Poisson). In the same spirit of [A. Giunti, R. H\"ofer and J. Vel\'azquez, ``Homogenization of the Poisson equation in randomly perforated domains under minimal assumptions on the size of the holes''], we work under minimal conditions on the integrability of the random radii. These ensure that the problem is well-defined but do not rule out the onset of clusters of holes.