Preconditioning by an extended matrix technique for convection-diffusion-reaction equations

Aurelian Nicola; Constantin Popa

doi:10.33993/jnaat372-890

Authors

Aurelian Nicola Ovidius University, Constanţa, Romania
Constantin Popa Ovidius University, Constanţa, Romania

DOI:

https://doi.org/10.33993/jnaat372-890

Keywords:

multilevel discretization, spectrally equivalent matrices, mesh independent preconditioning, positive semidefinite systems, CGLS algorithm

Abstract views: 218

Abstract

In this paper we consider a preconditioning technique for the ill-conditioned systems arising from discretisations of nonsymmetric elliptic boundary value problems. The rectangular preconditioning matrix is constructed via the transfer operators between successive discretization levels of the initial problem. In this way we get an extended, square, singular, consistent, but mesh independent well-conditioned linear system. Numerical experiments are presented for a 2D convection-diffusion-reaction problem.

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References

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