A mixed discontinuous Galerkin method for the wave equation

A mixed discontinuous Galerkin method for the wave equation
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DOI:
10.1016/j.camwa.2020.12.001
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发表时间:
2021
期刊:
Comput. Math. Appl.
影响因子:
--
通讯作者:
Limin He;Fei Wang;Jing Wen
Limin He;Fei Wang;Jing Wen
中科院分区:
其他
文献类型:
--
作者:
Limin He;Fei Wang;Jing Wen

文献摘要

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我们研究了求解二阶波动方程的混合间断伽辽金(DG)方法。应力变量 p 和位移变量 u 通过混合 DG 元素对 P k+ 1–P k (k≥ 0) 进行离散化。在解对的适当规律性假设下,我们得出空间半离散方案的最佳误差估计。具体来说,我们证明了 L 2 范数中 u 和 L 2 范数中 p 的最佳收敛阶。提出了一些测试问题,数值结果表明收敛阶数与预测误差估计一致。
We study a mixed discontinuous Galerkin (DG) method for solving the second-order wave equation. The stress variable p and the displacement variable u are discretized by the mixed DG element pair P k+ 1–P k (k≥ 0). Under appropriate regularity assumptions on the solution pair, we derive optimal error estimates for the spatially semi-discrete scheme. Specifically, we prove the optimal convergence orders for u in L 2 norm and p in L 2 norm. Some test problems are presented, and the numerical results show that the orders of convergence coincide with the predicted error estimates.