论文标题
作为张力 - MHD湍流中的动能光谱
As a matter of tension -- kinetic energy spectra in MHD turbulence
论文作者
论文摘要
在许多天体物理和地面系统中，磁化的湍流无处不在，但即使以最简单的形式，磁性水力学（MHD）也没有完整的，无可争议的理论。许多理论和现象学都集中在关节（动力学和磁性）通量和光谱上。我们强调了分别处理动力学和磁能的重要性，以阐明MHD湍流动力学。我们对亚音速，超级alfvénicMHD湍流进行隐式大型涡流模拟，并随着时间的推移分析尺度的能量转移。我们的主要发现是，随着动力张力抑制了动能级联，动能频谱在固定方案中的缩放率大约为$ k^{ - 4/3} $。这激发了现有的MHD湍流理论的重新评估，相对于能量通量的更具差异化的建模。
Magnetized turbulence is ubiquitous in many astrophysical and terrestrial systems but no complete, uncontested theory even in the simplest form, magnetohydrodynamics (MHD), exists. Many theories and phenomenologies focus on the joint (kinetic and magnetic) energy fluxes and spectra. We highlight the importance of treating kinetic and magnetic energies separately to shed light on MHD turbulence dynamics. We conduct an implicit large eddy simulation of subsonic, super-Alfvénic MHD turbulence and analyze the scale-wise energy transfer over time. Our key finding is that the kinetic energy spectrum develops a scaling of approximately $k^{-4/3}$ in the stationary regime as the kinetic energy cascade is suppressed by magnetic tension. This motivates a reevaluation of existing MHD turbulence theories with respect to a more differentiated modeling of the energy fluxes.
