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 1602.08602math.NAcs.NA
收藏

一种稳定化的有限元方法用于两场和三场斯托克斯本征值问题

A stabilized finite element method for the two-field and three-field Stokes eigenvalue problems

Universitat Politècnica de Catalunya(加泰罗尼亚理工大学);Gebze Technical University(格布泽科技大学);Università di Pavia(帕维亚大学)

Önder Türk, Daniele Boffi, Ramon Codina

AI总结:

本文提出一种稳定化有限元方法,用于解决两场和三场斯托克斯本征值问题,通过子网格尺度概念和残差项改进稳定性,恢复线性本征问题形式,并证明方法收敛性和误差估计。

摘要:

本文考虑了两场(位移-压力)和三场(应力-位移-压力)形式的斯托克斯本征值问题的稳定化有限元近似。所提出的方法基于子网格尺度概念,依赖于连续解不可解尺度的近似。通常,子网格尺度技术通过将残差基项添加到基本伽辽金公式中实现。将标准残差基稳定化方法应用于线性本征值问题会导致离散形式的二次本征值问题,这在物理上不方便。本文的特色是采用与有限元空间正交的不可解子尺度空间,从而解决上述问题。本质上,我们提出只有在使用正交投影时,残差才被简化,允许逐项稳定化。因此,我们不需要将整个残差放入公式中,从而正确恢复线性本征问题形式。我们证明所用方法是收敛的,并给出了本征值和本征函数的误差估计。我们报告了若干数值测试以验证理论结果。

英文摘要:

In this paper, the stabilized finite element approximation of the Stokes eigenvalue problems is considered for both the two-field (displacement-pressure) and the three-field (stress-displacement-pressure) formulations. The method presented is based on a subgrid scale concept, and depends on the approximation of the unresolvable scales of the continuous solution. In general, subgrid scale techniques consist in the addition of a residual based term to the basic Galerkin formulation. The application of a standard residual based stabilization method to a linear eigenvalue problem leads to a quadratic eigenvalue problem in discrete form which is physically inconvenient. As a distinguished feature of the present study, we take the space of the unresolved subscales orthogonal to the finite element space, which promises a remedy to the above mentioned complication. In essence, we put forward that only if the orthogonal projection is used, the residual is simplified and the use of term by term stabilization is allowed. Thus, we do not need to put the whole residual in the formulation, and the linear eigenproblem form is recovered properly. We prove that the method applied is convergent, and present the error estimates for the eigenvalues and the eigenfunctions. We report several numerical tests in order to illustrate that the theoretical results are validated.

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。

↑