Inverse of divergence and homogenization of compressible Navier-Stokes equations in randomly perforated domains (2103.04323v4)

Abstract: We analyze behavior of weak solutions to compressible fluid flows in a bounded domain in $\mathbb{R}^3$, randomly perforated by tiny balls with random size. Assuming the radii of the balls scale like $\varepsilon^\alpha$, $\alpha > 3$, with $\varepsilon$ denoting the average distance between the balls, the problem homogenize with the same limiting equation. Our main contribution is a construction of the Bogovski\u{\i} operator, uniformly in $\varepsilon$, without any assumptions on the minimal distance between the balls.