arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2107.07077physics.comp-phphysics.flu-dynphysics.plasm-ph
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基于矢量势的非周期流MHD傅里叶延拓算法

Vector potential-based MHD solver for non-periodic flows using Fourier continuation expansions

Mauro Fontana, Pablo D. Mininni, Oscar P. Bruno, Pablo Dmitruk

摘要:

提出了一种求解非周期边界导电流体中电磁场和速度场随时间演化的高阶方法。与基于FFT的快速伪谱方法相比,该方法具有较小的开销。它使用磁矢量位公式精确地执行零发散的磁场,并允许不同的边界条件,包括完美的导电墙或真空环境,两种情况下相关的许多天体物理,地球物理和工业流程。一个频谱傅里叶延拓方法是用来准确地表示所有领域及其空间导数,也允许有效的解决方案的泊松方程与不同的边界。研究了不同雷诺数和哈特曼数下的传导流,以及不同的边界条件,研究了该方法的收敛性和螺线管和边界条件的精度。

英文摘要:

A high-order method to evolve in time electromagnetic and velocity fields in conducting fluids with non-periodic boundaries is presented. The method has a small overhead compared with fast FFT-based pseudospectral methods in periodic domains. It uses the magnetic vector potential formulation for accurately enforcing the null divergence of the magnetic field, and allowing for different boundary conditions including perfectly conducting walls or vacuum surroundings, two cases relevant for many astrophysical, geophysical, and industrial flows. A spectral Fourier continuation method is used to accurately represent all fields and their spatial derivatives, allowing also for efficient solution of Poisson equations with different boundaries. A study of conducting flows at different Reynolds and Hartmann numbers, and with different boundary conditions, is presented to study convergence of the method and the accuracy of the solenoidal and boundary conditions.

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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