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arXiv 1303.3791math.NAcs.NA
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非线性扩散方程的熵耗散离散化与离散Beckner不等式

Entropy-dissipative discretization of nonlinear diffusion equations and discrete Beckner inequalities

Université Lille 1 Sciences et Technologies(里尔第一大学);INRIA Lille-Nord-Europe(法国国家信息与自动化研究所里尔北部中心);Vienna University of Technology(维也纳工业大学)

Claire Chainais-Hillairet, Ansgar Jüngel, Stefan Schuchnigg

AI总结:

针对具有Neumann或周期边界条件的多孔介质和快速扩散方程,证明了全离散有限体积近似在熵意义下的时间衰减,并显式计算了代数或指数衰减率,基于新的连续和离散广义Beckner不等式。

摘要:

针对具有Neumann或周期边界条件的多孔介质和快速扩散方程,证明了全离散有限体积近似在熵意义下的时间衰减。代数或指数衰减率被显式计算。特别地,数值格式耗散了连续方程所耗散的所有零阶熵。证明基于新的连续和离散广义Beckner不等式。此外,通过系统分部积分,在连续和离散情形下证明了一些一阶熵的指数衰减。一维和二维空间中的数值实验说明了理论结果,并表明参数的一些限制似乎只是技术性的。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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