Detailed analysis of fan-shaped jets in three dimensional numerical simulation

Detailed analysis of fan-shaped jets in three dimensional numerical simulation
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三维数值模拟中扇形射流的详细分析

DOI:
10.1088/1674-4527/11/6/010
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发表时间:
2011-01
影响因子:
1.8
通讯作者:
Fang, Cheng
Fang, Cheng
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Jiang, Rong-Lin;Shibata, K.;Isobe, H.;Fang, Cheng

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我们进行了三维电阻磁流体动力学模拟,研究使用初始剪切磁场配置(力自由场与电流片在中间的计算框)的磁重联。结果表明,重联喷流有两种类型:普通重联喷流和沿沿着引导磁场方向形成的扇形重联喷流。扇形喷流与普通的磁场张力作用下的重联喷流有很大的不同。有两个驱动力加速扇形射流。一种是洛伦兹力,它在初始阶段主导流体元的运动,然后在后期气体压力梯度力加速流体元的运动。还研究了磁场重联角和电阻率值的关系。这些喷流的形成和演化提供了对动态磁流体动力学喷流的新认识。
We performed three dimensional resistive magnetohydrodynamic simulations to study the magnetic reconnection using an initially shearing magnetic field configuration (force free field with a current sheet in the middle of the computational box). It is shown that there are two types of reconnection jets: the ordinary reconnection jets and fan-shaped jets, which are formed along the guide magnetic field. The fan-shaped jets are significantly different from the ordinary reconnection jets which are ejected by magnetic tension force. There are two driving forces for accelerating the fan-shaped jets. One is the Lorentz force which initially dominates the motion of fluid elements, and then the gas pressure gradient force accelerates the fluid elements in the later stage. The dependence on magnetic reconnection angle and resistivity value has also been studied. The formation and evolution of these jets provide a new understanding of dynamic magnetohydrodynamic jets.
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