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arXiv 2303.15460math.NAcs.NAmath.AP
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波传播问题的时空等几何方法的稳定性

Stability of space-time isogeometric methods for wave propagation problems

Sara Fraschini

摘要:

本论文旨在研究线性声波方程基于最大正则样条的无条件稳定时空等几何方法的第一步。波传播问题的时空离散的无条件稳定性是一个重要的研究课题,由于时空方法的优势相比,更标准的时间步进技术。在连续有限元法的情况下,已经提出了几种稳定化。受其中一项工作的启发,我们通过研究与波动方程密切相关的常微分方程的等几何方法来解决稳定性问题。因此,我们提供了一个稳定的等几何方法,其有效性得到了数值试验的支持。受这些结果的启发,我们得出结论,建议扩展这种稳定工具的空间-时间等几何制定的声波方程。

英文摘要:

This thesis aims at investigating the first steps toward an unconditionally stable space-time isogeometric method, based on splines of maximal regularity, for the linear acoustic wave equation. The unconditional stability of space-time discretizations for wave propagation problems is a topic of significant interest, by virtue of the advantages of space-time methods compared with more standard time-stepping techniques. In the case of continuous finite element methods, several stabilizations have been proposed. Inspired by one of these works, we address the stability issue by studying the isogeometric method for an ordinary differential equation closely related to the wave equation. As a result, we provide a stabilized isogeometric method whose effectiveness is supported by numerical tests. Motivated by these results, we conclude by suggesting an extension of this stabilization tool to the space-time isogeometric formulation of the acoustic wave equation.

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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