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arXiv 1303.6850math.NAcs.NA
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基于扩展有限元方法的Stokes问题虚拟区域方法

A fictitious domain approach for the Stokes problem based on the extended finite element method

Institut de Mathématiques de Toulouse, Université de Toulouse(图卢兹数学研究所,图卢兹大学)

Sébastien Court, Michel Fournié, Alexei Lozinski

AI总结:

提出一种受扩展有限元法启发的虚拟区域方法,用于处理边界不匹配的Stokes问题,通过混合有限元法、水平集函数和拉格朗日乘子施加Dirichlet边界条件,并引入稳定项改善界面应力近似,给出收敛性分析和数值测试。

摘要:

在本文中,我们提出将受扩展有限元法启发的虚拟区域方法扩展到Stokes问题,该方法已在[Renard]中针对Poisson问题进行了研究。该方法允许在边界不匹配的域中进行计算。对于流体流动,使用混合有限元法。流体与结构之间的界面通过水平集函数定位。Dirichlet边界条件通过拉格朗日乘子施加。引入稳定项以改善界面处Cauchy应力张量法向迹的近似,并避免速度空间与拉格朗日乘子空间之间的inf-sup条件。给出了收敛性分析,并进行了多个数值测试以说明该方法的能力。

英文摘要:

In the present work, we propose to extend to the Stokes problem a fictitious domain approach inspired by eXtended Finite Element Method and studied for Poisson problem in [Renard]. The method allows computations in domains whose boundaries do not match. A mixed finite element method is used for fluid flow. The interface between the fluid and the structure is localized by a level-set function. Dirichlet boundary conditions are taken into account using Lagrange multiplier. A stabilization term is introduced to improve the approximation of the normal trace of the Cauchy stress tensor at the interface and avoid the inf-sup condition between the spaces for velocity and the Lagrange multiplier. Convergence analysis is given and several numerical tests are performed to illustrate the capabilities of the method.

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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