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北美退伍军人节(Veterans Day),12 日无更新
arXiv 2001.03742math.NAcs.NAmath.AP
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非线性四阶抛物型方程的熵耗散finite-difference格式

Entropy-dissipating finite-difference schemes for nonlinear fourth-order parabolic equations

Marcel Braukhoff, Ansgar Jüngel

摘要:

对一维环面上的一般非线性四阶抛物型方程导出了保结构差分格式。例子包括薄膜和Derrida-Lebowitz-Speer-Spohn方程。这些方案保持了质量守恒,耗散了熵。与对数熵相关的方案也保持了正性。推导的思想是以避免链式法则的方式重新表述方程。一个中央有限差分离散,然后应用到重新制定。以这种方式,恢复了与连续情况相同的耗散率。该策略可以推广到一个多维薄膜方程。在一个和两个空间维度的数值例子说明了耗散特性。

英文摘要:

Structure-preserving finite-difference schemes for general nonlinear fourth-order parabolic equations on the one-dimensional torus are derived. Examples include the thin-film and the Derrida-Lebowitz-Speer-Spohn equations. The schemes conserve the mass and dissipate the entropy. The scheme associated to the logarithmic entropy also preserves the positivity. The idea of the derivation is to reformulate the equations in such a way that the chain rule is avoided. A central finite-difference discretization is then applied to the reformulation. In this way, the same dissipation rates as in the continuous case are recovered. The strategy can be extended to a multi-dimensional thin-film equation. Numerical examples in one and two space dimensions illustrate the dissipation properties.

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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