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arXiv 2201.00527math.NAcs.NA
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变步长BDF2和BDF3方法的稳定性

Stability of variable-step BDF2 and BDF3 methods

Zhaoyi Li, Hong-lin Liao

摘要:

我们证明了两步向后差分公式(BDF 2)方法在任意时间网格上是稳定的;而变步长BDF 3格式在几乎所有相邻步长比都小于2.553时是稳定的。这些结果放宽了文献中严格的网格限制,并提供了一个新的理解变步长BDF方法。我们的主要工具包括离散正交卷积核和椭圆型矩阵范数。

英文摘要:

We prove that the two-step backward differentiation formula (BDF2) method is stable on arbitrary time grids; while the variable-step BDF3 scheme is stable if almost all adjacent step ratios are less than 2.553. These results relax the severe mesh restrictions in the literature and provide a new understanding of variable-step BDF methods. Our main tools include the discrete orthogonal convolution kernels and an elliptic-type matrix norm.

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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