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SUPPRESSION OF PARTICLE DRIFTS BY TURBULENCE

机译:湍流对颗粒漂移的抑制

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We present results from direct numerical simulations showing the suppression of the large-scale drift motion of an ensemble of charged particles in a nonuniform turbulent magnetic field. We find that when scattering is negligible, the ensemble average drift velocity is in the direction predicted by the usual guiding center theory. When scattering is very strong, we find that all large-scale drift motions vanish. For an intermediate amount of scattering we find that the antisymmetric drift velocity is typically suppressed by a larger amount than the antisymmetric drift coefficient. We show that the total drift motion of the ensemble is not necessarily completely contained in the antisymmetric part of the diffusion tensor. Because of the occurrence of scattering, knowledge of the spatial variation of the symmetric part of the diffusion tensor is also needed to fully describe the total drift motion of the ensemble.
机译:我们目前的直接数值模拟结果表明,在非均匀湍流磁场中,带电粒子整体的大规模漂移运动受到抑制。我们发现,当散射可忽略不计时,整体平均漂移速度沿通常的引导中心理论预测的方向。当散射非常强时,我们发现所有大规模漂移运动都将消失。对于中等量的散射,我们发现反对称漂移速度通常比反对称漂移系数受到更大的抑制。我们表明,整体的总漂移运动不一定完全包含在扩散张量的反对称部分中。由于发生了散射,因此还需要了解扩散张量的对称部分的空间变化,以完整描述集合的总漂移运动。

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