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首页> 外文期刊>The Astrophysical journal >NUMERICAL SIMULATIONS OF Z-PINCH EXPERIMENTS TO CREATE SUPERSONIC DIFFERENTIALLY ROTATING PLASMA FLOWS
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NUMERICAL SIMULATIONS OF Z-PINCH EXPERIMENTS TO CREATE SUPERSONIC DIFFERENTIALLY ROTATING PLASMA FLOWS

机译:Z夹点实验产生超音速旋转等离子流的数值模拟

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The physics of accretion disks is of fundamental importance for understanding of a wide variety of astrophysical sources that includes protostars, X-ray binaries, and active galactic nuclei. The interplay between hydrodynamic flows and magnetic fields and the potential for turbulence-producing instabilities is a topic of active research that would benefit from the support of dedicated experimental studies. Such efforts are in their infancy, but in an effort to push the enterprise forward we propose an experimental configuration which employs a modified cylindrical wire array Z-pinch to produce a rotating plasma flow relevant to accretion disks. We present three-dimensional resistive magnetohydrodynamic simulations which show how this approach can be implemented. In the simulations, a rotating plasma cylinder or ring is formed, with typical rotation velocity ~30?km?s–1, Mach number ~4, and Reynolds number in excess of 107. The plasma is also differentially rotating. Implementation of different external magnetic field configurations is discussed. It is found that a modest uniform vertical field of 1 T can affect the dynamics of the system and could be used to study magnetic field entrainment and amplification through differential rotation. A dipolar field potentially relevant to the study of accretion columns is also considered.
机译:吸积盘的物理性质对于理解包括天体,X射线双星和活跃银河核在内的各种天体资源至关重要。流体动力流和磁场之间的相互作用以及产生湍流的不稳定性是一个活跃的研究主题,它将受益于专门的实验研究的支持。此类努力尚处于起步阶段,但为了推动企业发展,我们提出了一种实验配置,该配置采用改进的圆柱形线阵列Z型捏合装置来产生与吸积盘相关的旋转等离子体流。我们提出了三维电阻磁流体动力学模拟,显示了如何实现此方法。在模拟中,形成了旋转的等离子圆柱体或环,其典型旋转速度〜30?km?s–1,马赫数〜4,雷诺数超过107。等离子体也进行了差分旋转。讨论了不同外部磁场配置的实现。发现1 T的适度均匀垂直场会影响系统的动力学,并可用于研究通过差动旋转产生的磁场夹带和放大。还考虑了与吸积柱研究潜在相关的偶极场。

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