Convergence rates and fluctuations for the Stokes-Brinkman equations as homogenization limit in perforated domains

2020/04/08 by Richard M. Höfer, Höfer, Richard M., Jonas Jansen +1 · 1 citation
Computer Science · Physics and Astronomy · Engineering · #Advanced Mathematical Modeling in Engineering #Electromagnetic Scattering and Analysis #Composite Material Mechanics

paper · pdf · doi:10.48550/arxiv.2004.04111

Abstract

We study the homogenization of the Dirichlet problem for the Stokes equations in ℝ³ perforated by m spherical particles. We assume the positions and velocities of the particles to be identically and independently distributed random variables. In the critical regime, when the radii of the particles are of order m^-1, the homogenization limit u is given as the solution to the Brinkman equations. We provide optimal rates for the convergence u_m → u in L², namely m^-β for all β< 1/2. Moreover, we consider the fluctuations. In the central limit scaling, we show that these converge to a Gaussian field, locally in L²(ℝ³), with an explicit covariance. Our analysis is based on explicit approximations for the solutions u_m in terms of u as well as the particle positions and their velocities. These are shown to be accurate in H¹(ℝ³) to order m^-β for all β< 1. Our results also apply to the analogous problem regarding the homogenization of the Poisson equations.

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• Brinkman's term for the steady-state Navier-Stokes equations with prescribed flux rate or pressure drop in perforated pipes

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