arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.06700math.NAcs.NAmath.AP
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非均质多孔介质线性弹性问题的混合GMsFEM

Mixed GMsFEM for linear poroelasticity problems in heterogeneous porous media

Xia Wang, Eric Chung, Shubin Fu, Zhaoqin Huang

摘要:

精确的流固相互作用数值模拟具有重要的应用价值。这项任务在实际场景中具有挑战性,因为媒体通常具有非常大的对比度,并且高度异质。为了克服这一计算挑战,开发了各种多尺度方法。本文考虑一类高对比度非均匀多孔介质中的线性孔隙弹性问题,发展了一种混合广义多尺度有限元法(GMsFEM),以获得一种快速计算方法。我们的目标是开发一个多尺度方法,是强大的非均质性和对比度的介质,并给出了一个质量守恒的流体速度场。我们将为弹性位移和流体速度构造解耦的多尺度基函数。我们的多尺度基函数是局部的。该构造基于局部快拍空间和局部谱分解的适当选择,目的是提取解的主导模式。对于压力,我们将使用分段常数近似。我们将提出几个数值例子来说明我们的方法的性能。我们的结果表明,所提出的方法是能够得到精确的数值解与一个小的自由度。

英文摘要:

Accurate numerical simulations of interaction between fluid and solid play an important role in applications. The task is challenging in practical scenarios as the media are usually highly heterogeneous with very large contrast. To overcome this computational challenge, various multiscale methods are developed. In this paper, we consider a class of linear poroelasticity problems in high contrast heterogeneous porous media, and develop a mixed generalized multiscale finite element method (GMsFEM) to obtain a fast computational method. Our aim is to develop a multiscale method that is robust with respect to the heterogeneities and contrast of the media, and gives a mass conservative fluid velocity field. We will construct decoupled multiscale basis functions for the elastic displacement as well as fluid velocity. Our multiscale basis functions are local. The construction is based on some suitable choices of local snapshot spaces and local spectral decomposition, with the goal of extracting dominant modes of the solutions. For the pressure, we will use piecewise constant approximation. We will present several numerical examples to illustrate the performance of our method. Our results indicate that the proposed method is able to give accurate numerical solutions with a small degree of freedoms.

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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