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arXiv 1712.08922math.NAcs.NA
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一种用于磁流体动力学运动方程的新型无散有限元方法(使用矢量势)

A novel divergence-free Finite Element Method for the MHD Kinematics equations using Vector-potential

Academy of Mathematics and Systems Science, Chinese Academy of Sciences(中国科学院数学与系统科学研究院);School of Mathematical Science, University of Chinese Academy of Sciences(中国科学院大学数学科学学院)

Lingxiao Li

AI总结:

本文提出了一种新的混合有限元方法,用于求解三维稳态磁流体动力学(MHD)运动方程,其中流体速度已给定。该方法通过矢量势表示磁感应强度,并采用H(div)-相容元素离散电流密度,确保电流密度和磁感应强度的无散性,同时开发了基于块预条件器的预条件求解器。

摘要:

我们提出了一种新的混合有限元方法,用于求解三维稳态磁流体动力学(MHD)运动方程,其中流体速度已给定。尽管指定速度场比完整的MHD方程更简单,但其保守性和高效数值方法仍然是活跃的研究课题。我们离散方案的显著特点是同时满足电流密度和磁感应强度的无散条件。为了达到这一目标,我们使用磁矢量势来表示磁感应强度,并采用H(div)-相容元素对电流密度进行离散化。我们开发了一种基于块预条件器的预条件求解器,用于解决离散化所产生的代数系统。若干数值实验被实施以验证无散性质、有限元方案的收敛率以及预条件器的鲁棒性。

英文摘要:

We propose a new mixed finite element method for the three-dimensional steady magnetohydrodynamic (MHD) kinematics equations for which the velocity of the fluid is given. Although prescribing the velocity field leads to a simpler model than full MHD equations, its conservative and efficient numerical methods are still active research topic. The distinctive feature of our discrete scheme is that the divergence-free conditions for current density and magnetic induction are both satisfied. To reach this goal, we use magnetic vector potential to represent magnetic induction and resort to H(div)-conforming element to discretize the current density. We develop an preconditioned iterative solver based on a block preconditioner for the algebraic systems arising from the discretization. Several numerical experiments are implemented to verify the divergence-free properties, the convergence rate of the finite element scheme and the robustness of the preconditioner.

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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