MHD一様乱流の非等方化機構 : 第1報, 直接数値計算と統計的性質

概要

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Direct numerical simulations of MHD homogeneous turbulence in a uniform magnetic field are conducted to investigate the mechanism of anisotropy and decay of MHD turbulence. By applying a uniform magnetic field, fluctuations of velocity and vorticity are dumped significantly. Intensity of the velocity and vorticity fluctuations show anisotropic behaviors in which the intensities of velocity and vorticity parallel to the uniform magnetic field are greater than those perpendicular to the magnetic field. In this process, integral length scale and Taylor micro scale parallel to the uniform magnetic field become longer. The magnitude of fluctuating magnetic field and current density also show directional dependence. The fluctuation of the magnetic field and current density in the perpendicular direction is larger than those in the parallel direction.
一般社団法人日本機械学会の論文
1999-12-25