Relativistic centrifugal instability
Relativistic centrifugal instability
复制标题
相对论离心不稳定性
DOI：
--
复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
S. Komissarov
中科院分区：
文献类型：
--
作者：
K. Gourgouliatos;S. Komissarov
在中央发动机附近，许多天体物理喷射机预计将绕着它们的轴线旋转。在更远的地方，它们预计将经历精炼和再结晶的过程。在这两种情况下，流体沿着凹面流动，因此，它受到离心力的作用。众所周知，这样的流动可能会经历离心不稳定性（CFI），有许多实验室的例子。最近的计算机模拟的相对论性喷流从活动星系核进行的过程中的重新界定表明，在这样的喷流CFI可能占主导地位的Kelvin-Helmholtz不稳定性与速度剪切（Gourgouliatos和Komissarov）。在这封信中，我们推广的瑞利准则CFI在旋转流体相对论流动使用启发式分析。我们还提出了计算机模拟的结果，支持我们的分析标准的情况下，界面分离两个均匀旋转的圆柱形流。我们讨论了CFI和Rayleigh-Taylor不稳定性在弯曲流线流动中的区别。
Near the central engine, many astrophysical jets are expected to rotate about their axis. Further out they are expected to go through the processes of reconfinement and recollimation. In both these cases, the flow streams along a concave surface and hence, it is subject to the centrifugal force. It is well known that such flows may experience the centrifugal instability (CFI), to which there are many laboratory examples. The recent computer simulations of relativistic jets from active galactic nuclei undergoing the process of reconfinement show that in such jets CFI may dominate over the Kelvin–Helmholtz instability associated with velocity shear (Gourgouliatos & Komissarov). In this letter, we generalize the Rayleigh criterion for CFI in rotating fluids to relativistic flows using a heuristic analysis. We also present the results of computer simulations which support our analytic criterion for the case of an interface separating two uniformly rotating cylindrical flows. We discuss the difference between CFI and the Rayleigh–Taylor instability in flows with curved streamlines.