期刊
MAGNETOCHEMISTRY
卷 9, 期 9, 页码 -出版社
MDPI
DOI: 10.3390/magnetochemistry9090205
关键词
double tearing mode; viscosity; reconnection; plasmoids; Prandtl number
This paper studies the effects of viscosity on the evolution of the double tearing mode (DTM) in a pair of adjacent Harris sheets. It finds that a transition occurs in the generation of normal and monster plasmoids at P-r=1, and in the P-r<1 regime, both normal and monster plasmoids are generated, which is not observed in single tearing mode cases. When P-r exceeds the critical value, the generation of monster plasmoids stops, and a quadrupolar flow along the poloidal direction is observed in the P-r<1 regime, but this flow is inhibited in the Pr>1 regime.
In this paper, we study the effects of viscosity on the evolution of the double tearing mode (DTM) in a pair of adjacent Harris sheets based on the resistive MHD model in the NIMROD code. Similar to the tearing mode in the conventional single Harris sheet, a transition is observed in the generation of both normal and monster plasmoids at Prandtl number P-r=1. In the P-r<1 regime of the DTM, normal plasmoids (small plasmoids) are generated along with monster plasmoid, whereas in the single tearing mode (STM) cases, such a generation is not observed. When P-r is above the critical value, the generation of monster plasmoid is halted. Correspondingly, in the P-r<1 regime, a quadrupolar flow advects along the poloidal direction, but in the Pr>1 regime this flow advection is inhibited.
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