Convergence of the MAC Scheme for the Stokes/Darcy Coupling Problem

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Abstract

In this paper, we extend the MAC scheme for Stokes problem to the Stokes/Darcy coupling problem. The interface conditions between two separate regions are discretized and well-incorporated into the MAC grid setting. We first perform the stability analysis of the scheme for the velocity in both Stokes and Darcy regions and establish the stability for the pressure in both regions by considering an analogue of discrete divergence problem. Following the similar analysis on stability, we perform the error estimates for the velocity and the pressure in both regions. The theoretical results show the first-order convergence of the scheme in discrete \(L^2\) norms for both velocity and the pressure in both regions. Moreover, in fluid region, the first-order convergence for the x-derivative of velocity component u and the y-derivative of velocity component v is also obtained in discrete \(L^2\) norms. However, numerical tests show one order better for the velocity in Stokes region and the pressure in Darcy region.

Keywords

Stokes–Darcy flow MAC scheme Stability Convergence Finite difference method Staggered grids 

Notes

Acknowledgements

The work of M.-C. Lai was supported in part by Ministry of Science of Technology of Taiwan under research grant MOST-104-2115-M-009-014-MY3 while M.-C. Shiue was supported in part by the Grant MOST-104-2115-M-009-012-MY2. K.C. Ong was supported in part by NCTU Taiwan Elite Internship Program at National Chiao Tung University and NCTS.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Applied MathematicsNational Chiao Tung UniversityHsinchuTaiwan

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