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arXiv 2103.04324math.NAcs.NA
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wave equation无条件稳定时空有限元法的数值结果

Numerical results for an unconditionally stable space-time finite element method for the wave equation

Richard Löscher, Olaf Steinbach, Marco Zank

摘要:

在这项工作中,我们引入了一个新的空间-时间变分制定的二阶波动方程,其中分部积分法也适用于相对于时间变量,并使用修改的希尔伯特变换。对于由此产生的变分设置,拟设空间和测试空间相等。因此,符合有限元离散导致Galerkin-Bubnov格式。我们考虑了一个协调张量积方法与分段多项式,连续的基函数,这导致在一个无条件稳定的方法,即,不需要CFL条件。我们给出了一个一维和二维空间域的数值例子,其中的无条件稳定性和最佳收敛速度的时空规范说明。

英文摘要:

In this work, we introduce a new space-time variational formulation of the second-order wave equation, where integration by parts is also applied with respect to the time variable, and a modified Hilbert transformation is used. For this resulting variational setting, ansatz and test spaces are equal. Thus, conforming finite element discretizations lead to Galerkin--Bubnov schemes. We consider a conforming tensor-product approach with piecewise polynomial, continuous basis functions, which results in an unconditionally stable method, i.e., no CFL condition is required. We give numerical examples for a one- and a two-dimensional spatial domain, where the unconditional stability and optimal convergence rates in space-time norms are illustrated.

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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