arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1902.08112math.NAcs.NA
收藏

基于矩阵自由的多网格求解器用于相场断裂问题

Matrix-free multigrid solvers for phase-field fracture problems

Johann Radon Institute for Computational and Applied Mathematics, Austrian Academy of Sciences(奥地利科学院约翰·拉德纳计算与应用数学研究所);Institut für Angewandte Mathematik, Leibniz Universität Hannover(汉诺威莱布尼茨大学应用数学研究所);Cluster of Excellence PhoenixD (Photonics, Optics, and Engineering - Innovation Across Disciplines), Leibniz Universität Hannover(汉诺威莱布尼茨大学凤凰光电子学与跨学科创新卓越集群)

Daniel Jodlbauer, Ulrich Langer, Thomas Wick

AI总结:

本文提出了一种基于几何多网格方法的矩阵自由求解框架,用于求解单体准静态相场断裂模型。通过有限元方法的传统矩阵方法需要大量内存,成为严重瓶颈。矩阵自由方法克服了这一问题,大大减少了所需内存,允许在可用硬件上求解更大的问题。一个关键挑战是裂缝不可逆性,采用原-对偶主动集方法解决。在多网格算法的粗网格层次上必须可用细网格的主动集值。开发的多网格方法为广义最小残量求解器提供预条件器。该方法用于求解牛顿法中的线性方程,以处理整体非线性-单体离散位移/相场公式。几个数值示例展示了该求解技术的性能和鲁棒性。网格细化研究、相场正则化参数的变化、线性和非线性求解器的迭代次数以及一些并行性能均被进行,以证明所提出求解器在单个断裂、多个加压断裂和三维L形面板测试中的效率。

摘要:

在本文中,我们提出了一种用于求解单体准静态相场断裂模型的矩阵自由求解框架,采用几何多网格方法。在有限元方法中使用传统矩阵方法需要大量内存,最终成为严重瓶颈。矩阵自由方法克服了这一问题,大大减少了所需内存,允许在可用硬件上求解更大的问题。一个关键挑战是裂缝不可逆性,为此采用原-对偶主动集方法。在此,细网格的主动集值必须在多网格算法的粗网格层次上可用。所开发的多网格方法为广义最小残量求解器提供预条件器。该方法用于求解牛顿法中的线性方程,以处理整体非线性-单体离散位移/相场公式。几个数值示例展示了该求解技术的性能和鲁棒性。网格细化研究、相场正则化参数的变化、线性和非线性求解器的迭代次数以及一些并行性能均被进行,以证明所提出求解器在单个断裂、多个加压断裂和三维L形面板测试中的效率。

英文摘要:

In this work, we present a framework for the matrix-free solution to a monolithic quasi-static phase-field fracture model with geometric multigrid methods. Using a standard matrix based approach within the Finite Element Method requires lots of memory, which eventually becomes a serious bottleneck. A matrix-free approach overcomes this problems and greatly reduces the amount of required memory, allowing to solve larger problems on available hardware. One key challenge is concerned with the crack irreversibility for which a primal-dual active set method is employed. Here, the Active-Set values of fine meshes must be available on coarser levels of the multigrid algorithm. The developed multigrid method provides a preconditioner for a generalized minimal residual solver. This method is used for solving the linear equations inside Newton's method for treating the overall nonlinear-monolithic discrete displacement/phase-field formulation. Several numerical examples demonstrate the performance and robustness of our solution technology. Mesh refinement studies, variations in the phase-field regularization parameter, iterations numbers of the linear and nonlinear solvers, and some parallel performances are conducted to substantiate the efficiency of the proposed solver for single fractures, multiple pressurized fractures, and a L-shaped panel test in three dimensions.

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。

↑