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首页> 外文期刊>The Astrophysical journal >HIGH-RESOLUTION SIMULATIONS OF THE PLUNGING REGION IN A PSEUDO-NEWTONIAN POTENTIAL: DEPENDENCE ON NUMERICAL RESOLUTION AND FIELD TOPOLOGY
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HIGH-RESOLUTION SIMULATIONS OF THE PLUNGING REGION IN A PSEUDO-NEWTONIAN POTENTIAL: DEPENDENCE ON NUMERICAL RESOLUTION AND FIELD TOPOLOGY

机译：拟牛顿势力下的暴跌区域的高分辨率模拟：取决于数值分辨率和场拓扑

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摘要

New three-dimensional magnetohydrodynamic simulations of accretion disk dynamics in a pseudo-Newtonian Paczyhski-Wiita potential are presented. These have finer resolution in the inner disk than any previously reported. Finer resolution leads to increased magnetic field strength, greater accretion rate, and greater fluctuations in the accretion rate. One simulation begins with a purely poloidal magnetic field, the other with a purely toroidal field. Compared to the poloidal initial field simulation, a purely toroidal initial field takes longer to reach saturation of the magnetorotational instability and produces less turbulence and weaker magnetic field energies. For both initial field configurations, magnetic stresses continue across the marginally stable orbit; measured in units corresponding to the Shakura-Sunyaev α-parameter, the stress grows from ～0.1 in the disk body to as much as ～10 deep in the plunging region. Matter passing the inner boundary of the simulation has ～10% greater binding energy and ～10% smaller angular momentum than it did at the marginally stable orbit. Both the mass accretion rate and the integrated stress fluctuate widely on a broad range of timescales.
机译：提出了在伪牛顿Paczyhski-Wiita势中吸积盘动力学的新的三维磁流体动力学模拟。它们在内部磁盘中的分辨率比以前报告的分辨率更高。分辨率越高，磁场强度越高，吸积率越高，吸积率波动越大。一种模拟是从纯极向磁场开始的，另一种模拟是从纯环形磁场开始的。与多极初始场模拟相比，纯环形初始场需要更长的时间才能达到磁旋转不稳定性的饱和，并产生较少的湍流和较弱的磁场能量。对于这两个初始场配置，磁应力在边际稳定轨道上持续不断;以与Shakura-Sunyaevα参数相对应的单位进行测量，应力从圆盘体内的〜0.1增长到暴跌区的〜10深。通过模拟内边界的物质比在边缘稳定轨道上的结合能高约10％，角动量约小10％。质量增加率和综合应力在很大的时间范围内都会有很大的波动。

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