Advection improves homogenized models of continuum diffusion in one-dimensional heterogeneous media
- 12 December 2019
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review E
- Vol. 100 (6), 062113
- https://doi.org/10.1103/physreve.100.062113
Abstract
We propose an alternative homogenization method for one-dimensional continuum diffusion models with spatially variable (heterogeneous) diffusivity. Our method, which extends recent work on stochastic diffusion, assumes the constant-coefficient homogenized equation takes the form of an advection-diffusion equation with effective (diffusivity and velocity) coefficients. To calculate the effective coefficients, our approach involves solving two uncoupled boundary value problems over the heterogeneous medium and leads to coefficients depending on the spatially varying diffusivity (as usual) as well as the boundary conditions imposed on the heterogeneous model. Computational experiments comparing our advection-diffusion homogenized model to the standard homogenized model demonstrate that including an advection term in the homogenized equation leads to improved approximations of the solution of the original heterogeneous model.This publication has 17 references indexed in Scilit:
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