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arXiv 1611.02465math.NAcs.NAphysics.comp-ph
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隐式-显式中点方案在计算微磁学中的收敛性

Convergence of an implicit-explicit midpoint scheme for computational micromagnetics

TU Wien(维也纳工业大学)

Dirk Praetorius, Michele Ruggeri, Bernhard Stiftner

AI总结:

本文基于低阶有限元空间离散,研究Landau-Lifschitz-Gilbert方程的数值积分,采用隐式中点法则处理交换场,结合显式Adams-Bashforth方案处理低阶项,证明了该方法在时间上的二阶收敛性及弱解的收敛性。

摘要:

基于最低阶有限元空间离散,我们研究Landau-Lifschitz-Gilbert方程的数值积分。LLG的动力由所谓的有效场驱动,通常由交换场、外部场和低阶项如磁散场组成。后者需要在全空间中求解一个额外的偏微分方程。遵循Bartels和Prohl(2006)(《Landau-Lifschitz-Gilbert方程的隐式有限元方法收敛性》,SIAM J. Numer. Anal. 44)的工作,我们采用隐式中点法则处理交换场。然而,为了有效处理低阶项,我们结合中点法则与显式Adams-Bashforth方案。所得到的积分器在时间上具有二阶收敛性,我们证明了其向LLG弱解的无条件收敛性。数值实验验证了理论结果。

英文摘要:

Based on lowest-order finite elements in space, we consider the numerical integration of the Landau-Lifschitz-Gilbert equation (LLG). The dynamics of LLG is driven by the so-called effective field which usually consists of the exchange field, the external field, and lower-order contributions such as the stray field. The latter requires the solution of an additional partial differential equation in full space. Following Bartels and Prohl (2006) (Convergence of an implicit finite element method for the Landau-Lifschitz-Gilbert equation. SIAM J. Numer. Anal. 44), we employ the implicit midpoint rule to treat the exchange field. However, in order to treat the lower-order terms effectively, we combine the midpoint rule with an explicit Adams-Bashforth scheme. The resulting integrator is formally of second-order in time, and we prove unconditional convergence towards a weak solution of LLG. Numerical experiments underpin the theoretical findings.

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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