Compressibility Effects in the Dynamics of the Reversed-Field Pinch

被引：11
|
作者：
Onofri, M. [1 ]
Malara, F. [1 ]
Veltri, P. [1 ]
机构：
[1] Univ Calabria, Dipartimento Fis, I-87036 Arcavacata Di Rende, CS, Italy
来源：
PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 25期
关键词：
D O I：
10.1103/PhysRevLett.101.255002
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We study the reversed-field pinch through the numerical solution of the compressible magnetohydrodynamic equations. Two cases are investigated: In the first case the pressure is derived from an adiabatic condition, and in the second case the pressure equation includes heating terms due to resistivity and viscosity. In the adiabatic case a single helicity state is observed, and the reversed-field pinch configuration is formed for short time intervals and is finally lost. In the nonadiabatic case the system reaches a multiple helicity state, and the reversal parameter remains negative for a longer time. The results show the importance of compressibility in determining the large scale dynamics of the system.
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页数：4
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