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arXiv 2502.04871math.NAcs.NAmath.AP
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有限体积元法用于Landau-Lifshitz方程

Finite volume element method for Landau-Lifshitz equation

Soochow University(苏州大学);University of Science and Technology of China(中国科学技术大学);Suzhou Institute for Advanced Research, University of Science and Technology of China(中国科学技术大学苏州高等研究院)

Yunjie Gong, Jingrun Chen, Rui Du, Panchi Li

AI总结:

本文提出一种有限体积元法结合Gauss-Seidel投影法,用于求解微磁学问题,分析了空间误差和能量守恒律,并通过数值实验验证了方法的效率和稳定性。

摘要:

Landau-Lifshitz方程描述了铁磁材料中磁化方向的动力学行为。由于其本质的非线性和非凸约束,通常通过数值方法求解。本文提出了一种结合Gauss-Seidel投影法(GSPM)的有限体积元法(FVEM),用于微磁学模拟。我们提供了空间近似误差和采用FVEM时的能量守恒律。由于GSPM用于时间推进,离散系统被逐个组件解耦,使得计算复杂度与隐式求解标量热方程相当。这显著加速了实际模拟。我们通过若干数值实验验证了理论分析和效率提升。此外,我们研究了爆破解,并利用所提出的方法高效模拟了2D磁纹理。

英文摘要:

The Landau-Lifshitz equation describes the dynamics of magnetization in ferromagnetic materials. Due to the essential nonlinearity and nonconvex constraint, it is typically solved numerically. In this paper, we developed a finite volume element method (FVEM) with the Gauss-Seidel projection method (GSPM) for the micromagnetics simulations. We provide the approximation error in space and depict the energy law when the FVEM is adopted. Owing to the GSPM for time-marching, the discrete system is decoupled component by component, making the computational complexity comparable to that of solving the scalar heat equation implicitly. This significantly accelerates real simulations. We present several numerical experiments to validate the theoretical analysis and the efficiency gain. Additionally, we study the blow-up solution and efficiently simulate the 2D magnetic textures using the proposed method.

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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