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arXiv 2403.18520math.NAcs.NA
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非线性磁静力学问题的迭代求解器全局收敛性

Global convergence of iterative solvers for problems of nonlinear magnetostatics

Herbert Egger, Felix Engertsberger, Bogdan Radu

AI总结:

本文研究非线性磁静力学问题的迭代求解器收敛性,利用等价的最小化问题证明了阻尼牛顿法等方法的全局线性收敛性,并验证了理论结果在多种近似方案中的适用性。

摘要:

我们考虑非线性磁静力学问题的迭代求解器的收敛性。利用与底层最小化问题的等价性,我们能够建立一大类方法的全局线性收敛性,包括阻尼牛顿法、不动点迭代和Kacanov迭代,这些方法均可被解释为广义梯度下降法。考虑使用Armijo回溯法来自适应地选择步长。我们分析所需的一般假设涵盖了非均匀、非线性和各向异性材料以及永磁体。主要结果在连续层面上得到证明,但它们几乎可以逐字推广到各种近似方案中,包括有限元和等几何分析,从而得出与特定离散化无关的迭代次数界限。理论结果通过典型基准问题的数值测试进行了说明。

英文摘要:

We consider the convergence of iterative solvers for problems of nonlinear magnetostatics. Using the equivalence to an underlying minimization problem, we can establish global linear convergence of a large class of methods, including the damped Newton-method, fixed-point iteration, and the Kacanov iteration, which can all be interpreted as generalized gradient descent methods. Armijo backtracking isconsidered for an adaptive choice of the stepsize. The general assumptions required for our analysis cover inhomogeneous, nonlinear, and anisotropic materials, as well as permanent magnets. The main results are proven on the continuous level, but they carry over almost verbatim to various approximation schemes, including finite elements and isogeometric analysis, leading to bounds on the iteration numbers, which are independent of the particular discretization. The theoretical results are illustrated by numerical 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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