Journal
ESAIM-MATHEMATICAL MODELLING AND NUMERICAL ANALYSIS-MODELISATION MATHEMATIQUE ET ANALYSE NUMERIQUE
Volume 50, Issue 1, Pages 135-162Publisher
EDP SCIENCES S A
DOI: 10.1051/m2an/2015031
Keywords
Porous-medium equation; fast-diffusion equation; finite-volume method; entropy dissipation; Beckner inequality; entropy construction method
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Funding
- Austrian-French Project Amadee of the Austrian Exchange Service (OAD)
- Labex CEMPI [ANR-11-LABX-0007-01]
- Inria-Mephysto Team
- Austrian Science Fund (FWF) [P22108, P24304, I395, W1245]
- Austrian Science Fund (FWF) [P 22108, P 24304] Funding Source: researchfish
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The time decay of fully discrete finite-volume approximations of porous-medium and fast-diffusion equations with Neumann or periodic boundary conditions is proved in the entropy sense. The algebraic or exponential decay rates are computed explicitly. In particular, the numerical scheme dissipates all zeroth-order entropies which are dissipated by the continuous equation. The proofs are based on novel continuous and discrete generalized Beckner inequalities. Furthermore, the exponential decay of some first-order entropies is proved in the continuous and discrete case using systematic integration by parts. Numerical experiments in one and two space dimensions illustrate the theoretical results and indicate that some restrictions on the parameters seem to be only technical.
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