Homogenization of a Darcy–Stokes system modeling vuggy porous media |
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Authors: | Todd Arbogast Heather L. Lehr |
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Affiliation: | (1) Department of Mathematics, C1200, The University of Texas at Austin, Austin, TX 78712, USA;(2) Institute for Computational Engineering and Sciences, C0200, The University of Texas at Austin, Austin, TX 78712, USA;(3) Department of Mathematics, The Ohio State University, 231 W. 18th Avenue, Columbus, OH 43210, USA |
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Abstract: | We derive a macroscopic model for single-phase, incompressible, viscous fluid flow in a porous medium with small cavities called vugs. We model the vuggy medium on the microscopic scale using Stokes equations within the vugular inclusions, Darcy's law within the porous rock, and a Beavers–Joseph–Saffman boundary condition on the interface between the two regions. We assume periodicity of the medium and obtain uniform energy estimates independent of the period. Through a two-scale homogenization limit as the period tends to zero, we obtain a macroscopic Darcy's law governing the medium on larger scales. We also develop some needed generalizations of the two-scale convergence theory needed for our bimodal medium, including a two-scale convergence result on the Darcy–Stokes interface. The macroscopic Darcy permeability is computable from the solution of a cell problem. An analytic solution to this problem in a simple geometry suggests that: (1) flow along vug channels is primarily Poiseuille with a small perturbation related to the Beavers–Joseph slip, and (2) flow that alternates from vug to matrix behaves as if the vugs have infinite permeability. |
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Keywords: | Beavers– Joseph boundary condition Darcy– Stokes system Homogenization two-scale convergence vuggy porous media |
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