A general mixed covolume framework for constructing conservative schemes for elliptic problems |
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Authors: | So-Hsiang Chou Panayot S Vassilevski |
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Institution: | Department of Mathematics, Bowling Green State University, Bowling Green, Ohio 43403, U.S.A. ; Center of Informatics and Computing Technology, Bulgarian Academy of Sciences, ``Acad. G. Bontchev' street, Block 25 A, 1113 Sofia, Bulgaria |
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Abstract: | We present a general framework for the finite volume or covolume schemes developed for second order elliptic problems in mixed form, i.e., written as first order systems. We connect these schemes to standard mixed finite element methods via a one-to-one transfer operator between trial and test spaces. In the nonsymmetric case (convection-diffusion equation) we show one-half order convergence rate for the flux variable which is approximated either by the lowest order Raviart-Thomas space or by its image in the space of discontinuous piecewise constants. In the symmetric case (diffusion equation) a first order convergence rate is obtained for both the state variable (e.g., concentration) and its flux. Numerical experiments are included. |
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Keywords: | Conservative schemes mixed finite elements covolume methods finite volume methods finite volume element Raviart--Thomas spaces error estimates $H(\mydiv)$-preconditioning |
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