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An Enriched Petrov-Galerkin Method for Darcy Flow in Fractured Porous Media

An Enriched Petrov-Galerkin Method for Darcy Flow in Fractured Porous Media

Year:    2024

Author:    Huangxin Chen, Zixuan Wang

Annals of Applied Mathematics, Vol. 40 (2024), Iss. 4 : pp. 347–393

Abstract

We develop a locally mass-conservative enriched Petrov-Galerkin (EPG) method without any penalty term for the simulation of Darcy flow in fractured porous media. The discrete fracture model is applied to model the fractures as the lower dimensional fracture interfaces. The new method enriches the approximation trial space of the conforming continuous Galerkin (CG) method with bubble functions and enriches the approximation test space of the CG method with piecewise constant functions in the fractures and the surrounding porous media. We propose a framework for constructing the bubble functions and consider a decoupled algorithm for the EPG method. The solution of the pressure can be decoupled into two steps with a standard CG method and a post-processing correction. The post-processing correction based on the bubble functions in the matrix and the fractures can be solved separately, which is useful for parallel computing. We derive a priori and a posteriori error estimates for the problem. Numerical examples are presented to illustrate the performance of the proposed method.

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Journal Article Details

Publisher Name:    Global Science Press

Language:    English

DOI:    https://doi.org/10.4208/aam.OA-2024-0015

Annals of Applied Mathematics, Vol. 40 (2024), Iss. 4 : pp. 347–393

Published online:    2024-01

AMS Subject Headings:    Global Science Press

Copyright:    COPYRIGHT: © Global Science Press

Pages:    47

Keywords:    Discrete fracture model enriched Petrov-Galerkin method local mass conservation post-processing error analysis.

Author Details

Huangxin Chen

Zixuan Wang