arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.08744math.NAcs.NA
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高度非均匀介质中多相输运问题的混合多尺度有限元法比较

A comparison of mixed multiscale finite element methods for multiphase transport in highly heterogeneous media

Yiran Wang, Eric Chung, Shubin Fu

摘要:

本文系统地回顾和比较了两种求解高度非均匀介质中多相输运问题的混合多尺度有限元法。特别是,我们将考虑混合多尺度有限元法使用有限的整体信息,简称为MMsFEM,和混合广义多尺度有限元法(MGMsFEM)与残差驱动的在线多尺度基函数。这两种方法都是在混合多尺度有限元法的框架下,其中压力方程在粗网格中求解,并仔细构造了速度的多尺度基函数。两种方法中的多尺度基函数都包含了局部和全局的媒体信息。在有限全局信息的情况下,MsFEM在每个局部邻域内只使用一个多尺度基函数,而MGMsFEM使用多个基。我们将使用基准三维SPE10模型测试和比较这两种方法。将考虑一系列粗网格尺寸和基函数的不同组合(离线和在线),并报告每种情况的CPU时间。在我们的数值实验中,我们观察到上述两种方法具有良好的精度。最后,我们将讨论和比较这两种方法在精度和计算成本方面的优缺点。

英文摘要:

In this paper, we systemically review and compare two mixed multiscale finite element methods (MMsFEM) for multiphase transport in highly heterogeneous media. In particular, we will consider the mixed multiscale finite element method using limited global information, simply denoted by MMsFEM, and the mixed generalized multiscale finite element method (MGMsFEM) with residual driven online multiscale basis functions. Both methods are under the framework of mixed multiscale finite element methods, where the pressure equation is solved in the coarse grid with carefully constructed multiscale basis functions for the velocity. The multiscale basis functions in both methods include local and global media information. In terms of MsFEM using limited global information, only one multiscale basis function is utilized in each local neighborhood while multiple basis are used in MGMsFEM. We will test and compare these two methods using the benchmark three-dimensional SPE10 model. A range of coarse grid sizes and different combinations of basis functions (offline and online) will be considered with CPU time reported for each case. In our numerical experiments, we observe good accuracy by the two above methods. Finally, we will discuss and compare the advantages and disadvantages of the two methods in terms of accuracy and computational costs.

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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