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Convergence of a finite element method for degenerate two-phase flow in porous media (2001.08859v1)
Published 24 Jan 2020 in math.NA and cs.NA
Abstract: A finite element method with mass-lumping and flux upwinding, is formulated for solving the immiscible two-phase flow problem in porous media. The method approximates directly the wetting phase pressure and saturation, which are the primary unknowns. The discrete saturation satisfies a maximum principle. Theoretical convergence is proved via a compactness argument. The proof is convoluted because of the degeneracy of the phase mobilities and the unboundedness of the capillary pressure.