Energy transfers and magnetic energy growth in small-scale dynamo

被引：14
|
作者：
Kumar, Rohit [1 ]
Verma, Mahendra K. [1 ]
Samtaney, Ravi [2 ]
机构：
[1] Indian Inst Technol, Dept Phys, Kanpur 208016, Uttar Pradesh, India
[2] King Abdullah Univ Sci & Technol, Div Phys Sci & Engn, Thuwal 239556900, Saudi Arabia
来源：
EPL | 2013年 / 104卷 / 05期
关键词：
MAGNETOHYDRODYNAMIC TURBULENCE; FIELD; SIMULATIONS;
D O I：
10.1209/0295-5075/104/54001
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
In this letter we investigate the dynamics of magnetic energy growth in small-scale dynamo by studying energy transfers, mainly energy fluxes and shell-to-shell energy transfers. We perform dynamo simulations for the magnetic Prandtl number Pm = 20 on 1024(3) grid using the pseudospectral method. We demonstrate that the magnetic energy growth is caused by nonlocal energy transfers from the large-scale or forcing-scale velocity field to small-scale magnetic field. The peak of these energy transfers moves towards lower wave numbers as dynamo evolves, which is the reason why the integral scale of the magnetic field increases with time. The energy transfers U2U (velocity to velocity) and B2B (magnetic to magnetic) are forward and local. Copyright (C) EPLA, 2013
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页数：6
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