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arXiv 2207.04567math.NAcs.NAmath-phmath.APmath.MP
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非均匀弹性wave equations的间断Galerkin多尺度方法

A discontinuous Galerkin based multiscale method for heterogeneous elastic wave equations

Zhongqian Wang, Shubin Fu, Zishang Li, Eric Chung

摘要:

本文针对强非均匀介质中弹性波动方程,提出了一种局部多尺度模型降阶策略,该策略是通过在多尺度基函数的粗网格中求解问题来实现的。我们使用内部惩罚间断伽辽金(IPDG)耦合包含重要的异质介质信息的多尺度基函数。构造有效的多尺度基函数首先从仔细定义的谱问题中提取主导模式来表示重要的介质特征,然后求解约束能量最小化问题。然后应用Petrov-Galerkin投影和系统化到粗网格上。结果,得到了一个显式和节能的方案,快速在线仿真。该方法具有粗网格和频谱收敛,只要适当地选择过采样的大小。我们严格分析所提出的方法的稳定性和收敛性。数值结果显示了多尺度方法的性能,并证实了理论结果。

英文摘要:

In this paper, we develop a local multiscale model reduction strategy for the elastic wave equation in strongly heterogeneous media, which is achieved by solving the problem in a coarse mesh with multiscale basis functions. We use the interior penalty discontinuous Galerkin (IPDG) to couple the multiscale basis functions that contain important heterogeneous media information. The construction of efficient multiscale basis functions starts with extracting dominant modes of carefully defined spectral problems to represent important media feature, which is followed by solving a constraint energy minimization problems. Then a Petrov-Galerkin projection and systematization onto the coarse grid is applied. As a result, an explicit and energy conserving scheme is obtained for fast online simulation. The method exhibits both coarse-mesh and spectral convergence as long as one appropriately chose the oversampling size. We rigorously analyze the stability and convergence of the proposed method. Numerical results are provided to show the performance of the multiscale method and confirm the theoretical results.

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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