非轴对称的吸积盘的不稳定性分析Ⅱ.气压为主要压力

The Analysis of the Non-axisymmetric Instability of Accretion Disk Ⅱ. Gas Pressure Domination

针对非轴对称的吸积盘中压力主要为气压的区域,采用一种新的黏滞机制(反常磁黏滞),利用数值方法进行了吸积盘的不稳定性分析。结果表明,当吸积盘无黏滞时,吸积盘的稳定性不受不透明度的影响;随着方位角扰动波数n的增大,热模、黏滞模是越来越不稳定,In-模和Out-模则是越来越稳定;不同的黏滞机制对吸积盘不稳定性存在影响。

The non - axisymmetric instability of the gas - pressure - dominated accretion disk is solved by numerical simulations where we adopt a new viscosity prescription （ i. e. anomalous - viscosity）. The result is that there is little influence of the opacity in the case without viscosity. The thermal mode and viscous mode become more unstable, while I - mode and O - mode become more stable with the increase of the azimuthal perturbation wave number. The results are very different in the different viscosity prescriptions.