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arXiv 2007.06132math.NAcs.NA
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Poisson-Nernst-Planck方程的无条件保正和能量耗散格式

Unconditionally positivity preserving and energy dissipative schemes for Poisson--Nernst--Planck equations

Jie Shen, Jie Xu

摘要:

我们发展了一套Poisson-Nernst-Planck方程的数值格式。我们证明了我们的格式是质量守恒的,唯一可解的,并且无条件保持正性。此外,一阶格式被证明是无条件的能量耗散。这些属性适用于各种空间离散化。数值结果验证了这些属性。此外,数值结果表明,二阶格式也是能量耗散的,当方程满足最大值原理时,一阶和二阶格式都保持最大值原理.

英文摘要:

We develop a set of numerical schemes for the Poisson--Nernst--Planck equations. We prove that our schemes are mass conservative, uniquely solvable and keep positivity unconditionally. Furthermore, the first-order scheme is proven to be unconditionally energy dissipative. These properties hold for various spatial discretizations. Numerical results are presented to validate these properties. Moreover, numerical results indicate that the second-order scheme is also energy dissipative, and both the first- and second-order schemes preserve the maximum principle for cases where the equation satisfies the maximum principle.

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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