Objective vortex detection in an astrophysical dynamo

Objective vortex detection in an astrophysical dynamo
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天体物理发电机中的客观涡流检测

DOI:
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发表时间:
2017
期刊:
影响因子:
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通讯作者:
G. Haller
G. Haller
中科院分区:
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文献类型:
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作者:
E. Rempel;A. Chian;A. Chian;F. Beron;S. Szanyi;G. Haller

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一种新的技术,用于检测拉格朗日涡的螺旋磁流体动力发电机模拟。涡由拉格朗日平均涡度偏差的管状水平表面给出,涡度与其空间平均值的赋范差的轨迹积分。这种简单的方法是客观的,即在坐标系的时间相关旋转和平移下不变。我们还将该技术应用于磁场,并提出了积分平均电流偏差的方法来精确地确定磁涡旋的边界。讨论了太阳等离子体涡旋研究结果的相关性。
A novel technique for detecting Lagrangian vortices is applied to a helical magnetohydrodynamic dynamo simulation. The vortices are given by tubular level surfaces of the Lagrangian averaged vorticity deviation, the trajectory integral of the normed difference of the vorticity from its spatial mean. This simple method is objective, i.e. invariant under time-dependent rotations and translations of the coordinate frame. We also adapt the technique to use it on magnetic fields and propose the method of integrated averaged current deviation to determine precisely the boundary of magnetic vortices. The relevance of the results for the study of vortices in solar plasmas is discussed.
DOI: 10.1088/0004-637x/786/1/51
发表时间: 2014
期刊: The Astrophysical Journal
影响因子: --
作者:
Chian A
通讯作者: Chian A