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arXiv 1206.1933math.NAcs.NA
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Stokes问题的稳定化Nitsche虚拟区域方法

A stabilized Nitsche fictitious domain method for the Stokes problem

Simula Research Laboratory(Simula 研究实验室);Department of Mathematics, Umeå University(于默奥大学数学系)

Andre Massing, Mats G. Larson, Anders Logg, Marie E. Rognes

AI总结:

针对Stokes问题,提出一种基于低阶元的稳定化Galerkin有限元法的Nitsche虚拟区域方法,通过引入边界附近法向速度和压力梯度的跳跃惩罚项实现inf-sup稳定,并得到最优阶先验误差估计和条件数有界性。

摘要:

我们从速度和压力的低阶元的稳定化Galerkin有限元法出发,为Stokes问题开发了一种Nitsche虚拟区域方法。通过在边界附近引入法向速度和压力梯度的跳跃的额外惩罚项,我们证明了该方法是inf-sup稳定的。因此,建立了最优阶先验误差估计。此外,所得刚度矩阵的条件数被证明与边界位置无关。我们讨论了该方法在三维空间中的通用、灵活且免费可用的实现,并提供了支持理论结果的数值示例。

英文摘要:

We develop a Nitsche fictitious domain method for the Stokes problem starting from a stabilized Galerkin finite element method with low order elements for both the velocity and the pressure. By introducing additional penalty terms for the jumps in the normal velocity and pressure gradients in the vicinity of the boundary, we show that the method is inf-sup stable. As a consequence, optimal order a priori error estimates are established. Moreover, the condition number of the resulting stiffness matrix is shown to be bounded independently of the location of the boundary. We discuss a general, flexible and freely available implementation of the method in three spatial dimensions and present numerical examples supporting 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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