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arXiv 2108.07347math.NAcs.NA
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保正Patankar型方案的问题

Issues with Positivity-Preserving Patankar-type Schemes

Davide Torlo, Philipp Öffner, Hendrik Ranocha

摘要:

Patankar型格式是一种线性隐式时间积分方法,被设计为无条件保正。然而,只有很少的结果,其稳定性或鲁棒性。我们提出了两种方法来分析这些方法的性能和鲁棒性。特别是,我们证明了这些方法的问题的行为,即使是非常简单的线性问题,可以导致不希望的振荡和减少为消失的初始条件。最后,我们证明了在数值模拟,我们的线性问题的理论结果适用于类似的非线性刚性问题。

英文摘要:

Patankar-type schemes are linearly implicit time integration methods designed to be unconditionally positivity-preserving. However, there are only little results on their stability or robustness. We suggest two approaches to analyze the performance and robustness of these methods. In particular, we demonstrate problematic behaviors of these methods that, even on very simple linear problems, can lead to undesired oscillations and order reduction for vanishing initial condition. Finally, we demonstrate in numerical simulations that our theoretical results for linear problems apply analogously to nonlinear stiff problems.

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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