Degenerate Two-Phase Incompressible Flow IV: Local Refinement and Domain Decomposition

  • Authors:
  • Z. Chen;R. E. Ewing

  • Affiliations:
  • Department of Mathematics, Box 156, Southern Methodist University, Dallas, Texas 75275-0156 zchen@mail.smu.edu;Institute for Scientific Computation, Texas A&M University, College Station, Texas 77843-3404 ewing@ewing.tamu.edu

  • Venue:
  • Journal of Scientific Computing
  • Year:
  • 2003

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Abstract

This is the fourth paper of a series in which we analyze mathematical properties and develop numerical methods for a degenerate elliptic-parabolic partial differential system which describes the flow of two incompressible, immiscible fluids in porous media. In this paper we describe a finite element approximation for this system on locally refined grids. This adaptive approximation is based on a mixed finite element method for the elliptic pressure equation and a Galerkin finite element method for the degenerate parabolic saturation equation. Both discrete stability and sharp a priori error estimates are established for this approximation. Iterative techniques of domain decomposition type for solving it are discussed, and numerical results are presented.