Direct comparisons of compressible magnetohydrodynamics and reduced magnetohydrodynamics turbulence
Direct comparisons of compressible magnetohydrodynamics and reduced magnetohydrodynamics turbulence
复制标题
可压缩磁流体动力学和减少的磁流体动力学湍流的直接比较
DOI：
10.1063/1.2128573
复制
发表时间：
2005
影响因子：
2.2
通讯作者：
S. Oughton
中科院分区：
文献类型：
--
作者：
P. Dmitruk;W. Matthaeus;S. Oughton
直接数值模拟的低马赫数可压缩三维磁流体动力学（CMHD 3D）湍流在一个强的平均磁场的存在下进行了比较与模拟约化磁流体动力学（RMHD）。在三个空间坐标系中的周期性边界条件。选择不同的初始条件，探索RMHD的适用性，并研究如何接近的解决方案仍然是完全可压缩的MHD解决方案，因为都自由地演变的时间。在第一组中，初始状态准备满足在RMHD的推导中假设的条件，即，强平均磁场和平面极化波动，沿平均磁场沿着弱地变化。在这些情况下，模拟显示RMHD和CMHD3D几乎不可避免地相互进化。当某些条件放宽时，该协议将失效，但RMHD仍然相当接近CMHD 3D，特别是当平均磁场足够大时。此外，T...
Direct numerical simulations of low Mach number compressible three-dimensional magnetohydrodynamic (CMHD3D) turbulence in the presence of a strong mean magnetic field are compared with simulations of reduced magnetohydrodynamics (RMHD). Periodic boundary conditions in the three spatial coordinates are considered. Different sets of initial conditions are chosen to explore the applicability of RMHD and to study how close the solution remains to the full compressible MHD solution as both freely evolve in time. In a first set, the initial state is prepared to satisfy the conditions assumed in the derivation of RMHD, namely, a strong mean magnetic field and plane-polarized fluctuations, varying weakly along the mean magnetic field. In those circumstances, simulations show that RMHD and CMHD3D evolve almost indistinguishably from one another. When some of the conditions are relaxed the agreement worsens but RMHD remains fairly close to CMHD3D, especially when the mean magnetic field is large enough. Moreover, t...