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

2026/08/04 by Richard M. Höfer, Amina Mecherbet, Gianmarco Sperone
Mathematics · #math.AP #msc:76M50 #msc:76D05 #msc:35B27 #msc:35M32 #msc:35Q31

paper · pdf · doi:10.13140/rg.2.2.18110.45123

arxiv created 2026/08/04 · arxiv updated 2026/08/05

Abstract

The steady motion of a viscous incompressible fluid in a distorted pipe, containing several small particles of diameter \eps³ and mutual distance \eps, is modeled through the Navier-Stokes equations with mixed boundary conditions. Apart from inhomogeneous Dirichlet boundary conditions on the particles, these involve the Bernoulli pressure and the tangential velocity on the inlet and outlet of the tube, while either the transversal flux rate or the pressure drop is prescribed along the pipe. Applying the energy method in homogenization theory, we study the asymptotic behavior of the solutions to these systems as \eps → 0, without any restriction on the magnitude of the data, and show that the effective equations display an additional Brinkman term. An important feature of the present work concerns the required uniform bounds, which are achieved (in the case of the prescribed flux problem) by a contradiction argument based on Bernoulli's law for solutions of the stationary Euler equations.

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