A self-consistent treatment of the electromotive force in magnetohydrodynamics for large diffusivities
A self-consistent treatment of the electromotive force in magnetohydrodynamics for large diffusivities
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大扩散率磁流体动力学电动势的自洽处理
DOI：
10.1002/asna.201011358
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发表时间：
2010
影响因子：
0.9
通讯作者：
Courvoisier A
中科院分区：
文献类型：
--
作者：
Courvoisier A
通过对平均场电动力学的扩展，研究了大尺度磁场和速度场对强迫高扩散率磁流体动力学流动的影响。我们的结果推广了Rädler &勃兰登堡（2010）的结果，他们考虑了类似的情况，但假设洛伦兹力对动量方程的影响可以忽略不计。出现了新的平均耦合项，即使不存在通常的α效应，也会导致磁场和速度场的大规模增长（© 2010 WILEY-VCH Verlag GmbH & Co. KGaA，魏因海姆）
The coupled equations that describe the effect of large-scale magnetic and velocity fields on forced high-diffusivity magnetohydrodynamic flows are investigated through an extension of mean field electrodynamics. Our results generalise those of Rädler & Brandenburg (2010), who consider a similar situation but assume that the effect of the Lorentz force on the momentum equation can be neglected. New mean coupling terms are shown to appear, which can lead to large-scale growth of magnetic and velocity fields even when the usual a-effects are absent (© 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)