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arXiv 1506.07040math.NAcs.NA
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熵耗散的半离散Runge-Kutta方案用于非线性扩散方程

Entropy-dissipating semi-discrete Runge-Kutta schemes for nonlinear diffusion equations

Vienna University of Technology(维也纳工业大学)

Ansgar Jüngel, Stefan Schuchnigg

AI总结:

研究半离散Runge-Kutta方案在非线性抛物型扩散方程中的熵耗散条件,揭示其与熵差凹性的关系,并通过数值实验验证其全局性。

摘要:

针对非线性扩散方程的半离散Runge-Kutta方案进行了分析,确定了使方案局部耗散离散熵的条件。耗散性质是由于两个连续时间步间熵差的凹性所导致。该凹性与Bakry-Emery方法及熵的测地凸性相关。抽象条件被验证适用于拟线性抛物型方程(包括孔隙介质方程)、线性扩散系统及四阶量子扩散方程。对一维孔隙介质方程的不同Runge-Kutta有限差分离散化方案的数值实验显示,熵耗散性质实际上是全局的。

英文摘要:

Semi-discrete Runge-Kutta schemes for nonlinear diffusion equations of parabolic type are analyzed. Conditions are determined under which the schemes dissipate the discrete entropy locally. The dissipation property is a consequence of the concavity of the difference of the entropies at two consecutive time steps. The concavity property is shown to be related to the Bakry-Emery approach and the geodesic convexity of the entropy. The abstract conditions are verified for quasilinear parabolic equations (including the porous-medium equation), a linear diffusion system, and the fourth-order quantum diffusion equation. Numerical experiments for various Runge-Kutta finite-difference discretizations of the one-dimensional porous-medium equation show that the entropy-dissipation property is in fact global.

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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