论文标题
亚alfvénic湍流能量学的分析表征
Analytic characterization of sub-Alfvénic turbulence energetics
论文作者
论文摘要
磁水动力学（MHD）湍流是与许多系统相关的跨场过程。理解这些系统的先决条件是限制MHD湍流的作用，尤其是动力学和磁性形式之间的能量交换。到目前为止，强烈磁化和可压缩的湍流的能量学抵制了理解它们的尝试。数值模拟表明，动能可以比波动磁能大的数量级。我们通过计算基于相干圆柱体液体包裹的动力学来计算可压缩和亚alfvénic湍流的能量来解决这种缺乏平衡的难题。使用MHD Lagrangian，我们在分析上证明，转移到动力学的大部分磁能是存储在有序和波动磁场之间的耦合中的能量。分析关系与数值数据达到了惊人的一致性，最多可达二阶项。
Magnetohydrodynamic (MHD) turbulence is a cross-field process relevant to many systems. A prerequisite for understanding these systems is to constrain the role of MHD turbulence, and in particular the energy exchange between kinetic and magnetic forms. The energetics of strongly magnetized and compressible turbulence has so far resisted attempts to understand them. Numerical simulations reveal that kinetic energy can be orders of magnitude larger than fluctuating magnetic energy. We solve this lack-of-balance puzzle by calculating the energetics of compressible and sub-Alfvénic turbulence based on the dynamics of coherent cylindrical fluid parcels. Using the MHD Lagrangian, we prove analytically that the bulk of the magnetic energy transferred to kinetic is the energy stored in the coupling between the ordered and fluctuating magnetic field. The analytical relations are in striking agreement with numerical data, up to second order terms.
