An efficient linear scheme to approximate parabolic free boundary problems: error estimates and implementation

Nochetto, Ricardo H.; Verdi, Claudio

doi:10.1090/S0025-5718-1988-0942142-0

An efficient linear scheme to approximate parabolic free boundary problems: error estimates and implementation
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by Ricardo H. Nochetto and Claudio Verdi PDF

Math. Comp. 51 (1988), 27-53 Request permission

Abstract:

This paper deals with a fully discrete scheme to approximate multidimensional singular parabolic problems; two-phase Stefan problems and porous medium equations are included. The algorithm consists of approximating at each time step a linear elliptic partial differential equation by piecewise linear finite elements and then making an element-by-element algebraic correction to account for the nonlinearity. Several energy error estimates are derived for the physical unknowns; a sharp rate of convergence of $O({h^{1/2}})$ is our main result. The crucial point in implementing the scheme is the efficient resolution of linear systems involved. This topic is discussed, and the results of several numerical experiments are shown.

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