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arXiv 2001.04949math.NAcs.NA
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RC型电路波形松弛法中重叠的渐近分析

Asymptotic Analysis for Overlap in Waveform Relaxation Methods for RC Type Circuits

Martin J. Gander, Pratik M. Kumbhar, Albert E. Ruehli

摘要:

波形松弛(WR)方法基于将大电路划分为子电路,然后在所谓的时间窗口中针对多个时间步长分别求解子电路,并且在每个时间窗口中使用迭代来收敛到全局电路解。经典WR收敛相当慢,特别是当使用长时间窗口时。为了克服这个问题,引入了优化的WR(OWR),其基于优化的传输条件,比经典WR更有效地在子电路之间传输信息。我们在这里研究的重叠子电路的影响,在WR和OWR适用于RC电路的第一次。我们给出了一个电路解释的新的传输条件在OWR和推导出封闭形式的渐近表达式的电路元件表示的优化参数在OWR。我们的分析表明,参数是完全不同的重叠的情况下,相比,非重叠的。然后,我们在数值上表明,我们的优化选择表现良好,也适用于我们的分析未涵盖的情况。本文提供了一种推导优化参数的通用方法,可以扩展到其他电路或微分方程或时空偏微分方程系统。

英文摘要:

Waveform relaxation (WR) methods are based on partitioning large circuits into sub-circuits which then are solved separately for multiple time steps in so-called time windows, and an iteration is used to converge to the global circuit solution in each time window. Classical WR converges quite slowly, especially when long time windows are used. To overcome this issue, optimized WR (OWR) was introduced which is based on optimized transmission conditions that transfer information between the sub-circuits more efficiently than classical WR. We study here for the first time the influence of overlapping sub-circuits in both WR and OWR applied to RC circuits. We give a circuit interpretation of the new transmission conditions in OWR and derive closed-form asymptotic expressions for the circuit elements representing the optimization parameter in OWR. Our analysis shows that the parameter is quite different in the overlapping case, compared to the nonoverlapping one. We then show numerically that our optimized choice performs well, also for cases not covered by our analysis. This paper provides a general methodology to derive optimized parameters and can be extended to other circuits or system of differential equations or space-time PDEs.

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