arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2409.01015math.NAcs.NA
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关于使用局部拟牛顿更新的非线性磁场求解器

On nonlinear magnetic field solvers using local Quasi-Newton updates

Herbert Egger, Felix Engertsberger, Lukas Domenig, Klaus Roppert, Manfred Kaltenbacher

AI总结:

本文提出用局部拟牛顿更新构造非线性磁场材料行为线性化的迭代求解器,兼具牛顿法快速收敛与定点法无需导数的优势,并证明三种方法全局且与网格无关的收敛性。

摘要:

定点法或牛顿法通常用于数值求解由非线性磁场问题离散化产生的非线性系统。我们在此讨论一种替代策略,该策略使用局部拟牛顿更新在非线性迭代过程中构造材料行为的适当线性化。所得格式表现出与牛顿法相似的快速收敛性,但与定点法一样,不需要底层材料定律的导数信息。因此,该方法可用于高效求解涉及非光滑材料行为的迟滞模型。所提格式的实现可在标准有限元代码中与定点法和牛顿法并行完成。文中建立了所有三种方法的完整收敛分析,证明了与网格无关的全局收敛性。通过针对典型基准问题的计算测试,评估了非线性迭代格式的理论结果和性能。

英文摘要:

Fixed-point or Newton-methods are typically employed for the numerical solution of nonlinear systems arising from discretization of nonlinear magnetic field problems. We here discuss an alternative strategy which uses local Quasi-Newton updates to construct appropriate linearizations of the material behavior during the nonlinear iteration. The resulting scheme shows similar fast convergence as the Newton-method but, like the fixed-point methods, does not require derivative information of the underlying material law. As a consequence, the method can be used for the efficient solution of models with hysteresis which involve nonsmooth material behavior. The implementation of the proposed scheme can be realized in standard finite-element codes in parallel to the fixed-point and the Newton method. A full convergence analysis of all three methods is established proving global mesh-independent convergence. The theoretical results and the performance of the nonlinear iterative schemes are evaluated by computational tests for a typical benchmark problem.

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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