Dynamic fission instabilities in rapidly rotating n=3/2 polytropes: a comparison of results from finite-difference and smoothed particle hydrodynamics codes
Dynamic fission instabilities in rapidly rotating n=3/2 polytropes: a comparison of results from finite-difference and smoothed particle hydrodynamics codes
复制标题
快速旋转 n=3/2 多变体中的动态裂变不稳定性：有限差分和平滑粒子流体动力学代码结果的比较
DOI：
10.1086/164248
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发表时间：
1986
期刊：
影响因子：
--
通讯作者：
A. Boss
中科院分区：
文献类型：
--
作者：
R. Durisen;R. Gingold;J. E. Tohline;A. Boss
评价了三种不同的流体力学模型对快速旋转平衡流中裂变不稳定性的影响的有效性。非轴对称开尔文模式的不稳定性随着流动中旋转能量的增加而增加，这种不稳定性可能发生在近距离双星和行星形成过程中，当流体原物体以准等静力收缩时。采用多向性指数为3/2，总旋转动能与重力能之比分别为0.33和0.38，研究了两种有限差分、供体细胞方法和光滑粒子流体力学（SPH）代码。模型表明，具有3/2多向性指数的动力杆不稳定性不会产生分离的二元体和多体系。喷射出的质量和角动量形成两个尾随的螺旋臂，在中心残骸周围形成圆盘或环。SPH代码产生的数据与有限差分代码相同，但计算工作量更少，并且在低密度区域没有可接受的流体约束。讨论了改进这两种代码的方法。68年引用。
The effectiveness of three different hydrodynamics models is evaluated for the analysis of the effects of fission instabilities in rapidly rotating, equilibrium flows. The instabilities arise in nonaxisymmetric Kelvin modes as rotational energy in the flow increases, which may occur in the formation of close binary stars and planets when the fluid proto-object contracts quasi-isostatically. Two finite-difference, donor-cell methods and a smoothed particle hydrodynamics (SPH) code are examined, using a polytropic index of 3/2 and ratios of total rotational kinetic energy to gravitational energy of 0.33 and 0.38. The models show that dynamic bar instabilities with the 3/2 polytropic index do not yield detached binaries and multiple systems. Ejected mass and angular momentum form two trailing spiral arms that become a disk or ring around the central remnant. The SPH code yields the same data as the finite difference codes but with less computational effort and without acceptable fluid constraints in low density regions. Methods for improving both types of codes are discussed. 68 references.