The Mathematical Institute, University of Oxford, Eprints Archive

A two-pressure model for slightly compressible single phase flow in bi-structured porous media

Soulaine, C. and Davit, Y. and Quintard, M. (2012) A two-pressure model for slightly compressible single phase flow in bi-structured porous media. Chemical Engineering Science . (Submitted)

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Abstract

Problems involving flow in porous media are ubiquitous in many natural and engineered systems. Mathematical modeling of such systems often relies on homogenization of pore-scale equations and macroscale continuum descriptions. For single phase flow, Stokes equations at the pore-scale are generally approximated by Darcy’s law at a larger scale. In this work, we develop an alternative model to Darcy’s law that can be used to describe slightly compressible single phase flow within bi-structured porous media. We use the method of volume averaging to upscale mass and momentum balance equations with the fluid phase split into two fictitious domains. The resulting macroscale model combines two coupled equations for average pressures with regional Darcy’s laws for velocities. In these equations, effective parameters are expressed via integrals of mapping variables that solve boundary value problems over a representative unit cell. Finally, we illustrate the behaviour of these equations in a two-dimensional model porous medium and validate our approach by comparing solutions of the homogenized equations with computations of the exact microscale problem.

Item Type:Article
Subjects:D - G > General
Research Groups:Oxford Centre for Collaborative Applied Mathematics
ID Code:1565
Deposited By:Peter Hudston
Deposited On:20 Jul 2012 07:55
Last Modified:20 Jul 2012 07:55

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