MHD一様乱流の非等方化機構 : 第3報,Coherent微細渦による変動磁場形成(流体工学,流体機械)

概要

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The generation and the development of the magnetic flux density fluctuation due to the coherent fine scale eddies are investigated in detail by analyzing DNS data of MHD homogeneous turbulence. With the addition of the magnetic field, two circulations of magnetic flux density fluctuation are generated around the eddy on the plane perpendicular to the axis of coherent fine scale eddy in the early stage, while these circulations disappear with time. The current density shows the maximum and the minimum value on the same plane. The distance between the center of the eddy and the location of the maximum or the minimum is almost same with the radius of the fine scale eddy. If the axis of the fine scale eddy is perpendicular to the direction of the applied magnetic field, the Lorentz force weakens the swirling motion of the eddy and works as shear stress for it. However, the Lorentz force tends to expand the eddy if the axis of the fine scale eddy is parallel to the direction of the applied magnetic field.
一般社団法人日本機械学会の論文
2003-02-25