arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1608.01944math.NAcs.NA
收藏

加权不连续伽辽金方法:在异质介质中的波传播

Weight-adjusted discontinuous Galerkin methods: wave propagation in heterogeneous media

Virginia Tech(弗吉尼亚理工大学);TOTAL E&P Research and Technology USA(道达尔能源勘探与生产美国研究与技术中心)

Jesse Chan, Russell J. Hewett, T. Warburton

AI总结:

本文提出加权加权不连续伽辽金方法,通过替换加权L2内积以减少存储成本,实现能量稳定的波传播求解,适用于异质介质中的声波方程。

摘要:

时域不连续伽辽金(DG)方法用于波传播需要考虑密集元素质量矩阵的求逆,其中每个质量矩阵是相对于参数加权的L2内积计算的。在波速在亚元素尺度上空间变化的应用中,这些矩阵在每个元素上都不同,需要额外存储。本文提出一种加权加权DG(WADG)方法,通过将加权L2内积替换为加权内积来减少存储成本。等效内积导致能量稳定的方案,但对局部变化的权重不增加存储成本。推导了先验误差估计,并给出了数值示例,展示了该方法应用于具有异质波速的声波方程的应用。

英文摘要:

Time-domain discontinuous Galerkin (DG) methods for wave propagation require accounting for the inversion of dense elemental mass matrices, where each mass matrix is computed with respect to a parameter-weighted L2 inner product. In applications where the wavespeed varies spatially at a sub-element scale, these matrices are distinct over each element, necessitating additional storage. In this work, we propose a weight-adjusted DG (WADG) method which reduces storage costs by replacing the weighted L2 inner product with a weight-adjusted inner product. This equivalent inner product results in an energy stable method, but does not increase storage costs for locally varying weights. A-priori error estimates are derived, and numerical examples are given illustrating the application of this method to the acoustic wave equation with heterogeneous wavespeed.

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。

↑