Nonlinear motion of a current-vortex sheet in MHD Richtmyer-Meshkov instability

8th International Conference on Inertial Fusion Sciences and Applications

Matsuoka, Chihiro^1 ; Nishihara, Katsunobu^2 ; Sano, Takayoshi^2

Department of Physics, Graduate School of Science and Technology, Ehime University, 2-5 Bunkyocho, Ehime Matsuyama, Japan^1

Institute of Laser Engineering, Osaka University, 2-6, Yamada-oka, Suita Osaka

565-0871, Japan^2

关键词: Current-vortex sheet;    Fluid interface;    Homogeneous magnetic field;    Non-linear motions;    Richtmyer Meshkov instability;    Strong magnetic fields;    Vortex methods;    Vortex sheet;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/688/1/012063/pdf
DOI  :  10.1088/1742-6596/688/1/012063

来源: IOP

【 摘 要 】

Nonlinear motion of a vortex sheet applied an initially homogeneous magnetic field is investigated using the vortex method. We show that the existence of a vortex sheet induces a strong magnetic field and non-uniform current at the fluid interface. This system can be a model of MHD Richtmyer-Meshkov instability (MHD RMI). We present some interfacial profiles in MHD RMI and discuss the difference between the pure vortex sheet in ordinary RMI and the current-vortex sheet in MHD RMI, in which it is shown that the magnetic field suppresses the roll-up of the vortex sheet. We also find that the strong magnetic field amplification is caused by the stretch of the interface.