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arXiv 2502.08306math.NAcs.NA
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离子输运交叉扩散模型有限体积格式的后验误差控制

A posteriori error control for a finite volume scheme for a cross-diffusion model of ion transport

Arne Berrens, Jan Giesselmann

AI总结:

本文为模拟纳米孔离子输运的交叉扩散系统的单元中心有限体积格式建立了首个可靠后验误差估计,并通过数值实验验证其与真实误差同阶。

摘要:

我们针对一种单元中心有限体积格式推导了可靠的后验误差估计,该格式用于逼近模拟离子通过纳米孔输运的交叉扩散系统。为此,我们建立了一个独立于数值格式的稳定性框架,并引入了数值解的适当(协调)重构。该稳定性框架依赖于一些简化假设,这些假设与该系统弱唯一性结果中所作的假设一致。此外,当存在电场力时,我们假设溶剂浓度具有一致的下界。这是针对交叉扩散系统的首个后验误差估计。在此过程中,我们还为逼近扩散方程的有限体积格式推导了逐点后验误差估计。我们开展的数值实验表明,该误差估计器与真实误差具有相同的数量阶缩放关系。

英文摘要:

We derive a reliable a posteriori error estimate for a cell-centered finite volume scheme approximating a cross-diffusion system modeling ion transport through nanopores. To this end, we derive a stability framework that is independent of the numerical scheme and introduce a suitable (conforming) reconstruction of the numerical solution. The stability framework relies on some simplifying assumptions that coincide with those made in weak uniqueness results for this system. Additionally, when electrical forces are present, we assume that the solvent concentration is uniformly bounded from below. This is the first a posteriori error estimate for a cross-diffusion system. Along the way, we derive a pointwise a posteriori error estimate for a finite volume scheme that approximates the diffusion equation. We conduct numerical experiments showing that the error estimator scales with the same order as the true error.

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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