时变域问题的高阶保守切割有限元法

IF 6.9 1区工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY Computer Methods in Applied Mechanics and Engineering Pub Date : 2024-08-06 DOI:10.1016/j.cma.2024.117245

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引用次数: 0

摘要

针对演化域中的对流扩散方程，提出了一种质量守恒高阶非拟合有限元方法。P. Hansbo, M. G. Larson, S. Zahedi, Comput.Hansbo, M. G. Larson, S. Zahedi, Comput.Methods Appl.Engrg.307 (2016)] 中提出的时空方法进行了扩展，利用雷诺输运定理自然实现了质量守恒。此外，通过将随时间变化的域划分为宏元，为随时间变化的域中的切割有限元法提出了一种更有效的稳定程序。数值实验表明，该方法能满足质量守恒要求，实现高阶收敛，并在增加稀疏性的同时控制了系统矩阵的条件数。研究考虑了体域问题以及体-面耦合问题。

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A high-order conservative cut finite element method for problems in time-dependent domains

A mass-conservative high-order unfitted finite element method for convection–diffusion equations in evolving domains is proposed. The space–time method presented in [P. Hansbo, M. G. Larson, S. Zahedi, Comput. Methods Appl. Mech. Engrg. 307 (2016)] is extended to naturally achieve mass conservation by utilizing Reynolds’ transport theorem. Furthermore, by partitioning the time-dependent domain into macroelements, a more efficient stabilization procedure for the cut finite element method in time-dependent domains is presented. Numerical experiments illustrate that the method fulfills mass conservation, attains high-order convergence, and the condition number of the resulting system matrix is controlled while sparsity is increased. Problems in bulk domains as well as coupled bulk-surface problems are considered.

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来源期刊

Computer Methods in Applied Mechanics and Engineering 工程技术-工程：综合

CiteScore

12.70

自引率

15.30%

发文量

719

审稿时长

44 days

期刊介绍： Computer Methods in Applied Mechanics and Engineering stands as a cornerstone in the realm of computational science and engineering. With a history spanning over five decades, the journal has been a key platform for disseminating papers on advanced mathematical modeling and numerical solutions. Interdisciplinary in nature, these contributions encompass mechanics, mathematics, computer science, and various scientific disciplines. The journal welcomes a broad range of computational methods addressing the simulation, analysis, and design of complex physical problems, making it a vital resource for researchers in the field.