A study of shear flows induced by nonlinear evolution of double tearing modes in Hall magnetohydrodynamics
A study of shear flows induced by nonlinear evolution of double tearing modes in Hall magnetohydrodynamics
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DOI：
10.1140/epjd/e2011-20106-4
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发表时间：
2011-07
期刊：
影响因子：
--
通讯作者：
X. Li;X. Q. Lu;X. Gong;Q. H. Huang
中科院分区：
文献类型：
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作者：
X. Li;X. Q. Lu;X. Gong;Q. H. Huang
采用霍尔磁流体力学方法对平板几何中双撕裂模的非线性演化引起的剪切流进行了数值研究。当电流片厚度减小且福尔斯落在离子惯性长度di范围内时，霍尔效应起重要作用。磁岛中的有效剪切流在磁重联过程中产生并最终消失。在霍尔主导系统中，诱导环向速度比诱导极向速度更敏感。此外，本文还研究和讨论了托卡马克谐振表面剪切流的时间演化。
Shear flows induced by the nonlinear evolution of double tearing modes are studied numerically using Hall magnetohydrodynamics simulations in a slab geometry. The Hall effect is shown to plays an important role when the thickness of current sheets decrease and falls in the range of ion inertia lengthdi. Effective shear flows in the magnetic islands are generated during the process of magnetic reconnection and disappear finally. The induced toroidal velocity are shown to be more sensitive than the induced poloidal velocities in the Hall dominant systems. Moreover, the temporal evolution of the shear flows in the Tokamak resonant surface is studied and discussed.