Radial Transport and Meridional Circulation in Accretion Disks
Radial Transport and Meridional Circulation in Accretion Disks
复制标题
吸积盘中的径向传输和经向环流
DOI：
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复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
R. Rafikov
中科院分区：
文献类型：
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作者：
A. Philippov;R. Rafikov
在三维天体物理吸积盘中，内应力驱动的粒子、元素和流体的径向输运是一个重要的现象，可能与原行星盘中的尘埃向外输送、彗星中难熔粒子的起源、地月系统中的同位素平衡等有关。为了更好地了解这些过程，我们探索了具有剪切粘性的三维天体物理吸积盘中的经向环流与其热层结的关系，并证明了后者对径向流动的强烈影响。以前的局部等温研究通常发现中面附近的径向流出模式，切换到更高的流入。在这里，我们从解析和数值两个方面说明，在具有随高度急剧增加的熵和温度的圆盘中，在所有高度向内流动都是可能的。这种热力学条件在光学薄、粘性加热的吸积盘中可能是典型的。不具备这些条件的圆盘，只要其内部应力是由剪切粘度提供的，就应该在中面附近出现径向流出。我们的结果也可用于设计具有给定子午线环流模式的流体动力盘模拟。
Radial transport of particles, elements and fluid driven by internal stresses in three-dimensional (3D) astrophysical accretion disks is an important phenomenon, potentially relevant for the outward dust transport in protoplanetary disks, origin of the refractory particles in comets, isotopic equilibration in the Earth–Moon system, etc. To gain better insight into these processes, we explore the dependence of meridional circulation in 3D disks with shear viscosity on their thermal stratification, and demonstrate a strong effect of the latter on the radial flow. Previous locally isothermal studies have normally found a pattern of the radial outflow near the midplane, switching to inflow higher up. Here we show, both analytically and numerically, that a flow that is inward at all altitudes is possible in disks with entropy and temperature steeply increasing with height. Such thermodynamic conditions may be typical in the optically thin, viscously heated accretion disks. Disks in which these conditions do not hold should feature radial outflow near the midplane, as long as their internal stress is provided by the shear viscosity. Our results can also be used for designing hydrodynamical disk simulations with a prescribed pattern of the meridional circulation.
具有由垂直剪切不稳定产生的湍流的圆盘中的颗粒动力学
DOI：
10.1051/0004-6361/201527716
发表时间：
2016
期刊：
arXiv: Earth and Planetary Astrophysics
影响因子：
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作者：
M.H.R.
通讯作者：
M.H.R.
吸积盘中的各向异性流体动力湍流
影响因子：
6.5
作者：
Picogna
通讯作者：
Picogna