论文标题
在免费发展的扭曲的原月光光下，参数不稳定
Parametric instability in a free evolving warped protoplanetary disc
论文作者
论文摘要
由于局部模拟证实，由于惯性波的参数共振，低粘度的翘曲积聚盘容易出现流体动力的不稳定。使用平滑的颗粒流体动力学（SPH）或基于网格的代码的翘曲盘的全球模拟是无处不在的，但尚未看到这种不稳定。在这里，我们利用一种混合戈诺夫型拉格朗日方法来研究以前所未有的高分辨率（高达1.2亿个粒子）的扭曲开普勒盘的全球模拟中的参数不稳定性。在全球模拟中，翘曲的传播在不稳定性之前的线性弯曲波动很好地描述了。随之而来的湍流在全球模拟中首次捕获，潮湿的相对轨道倾斜并导致角动量赤字减少。结果，扭曲在一个弯曲的波动时间内经历了重大阻尼。观察到的原球椎间盘经扭曲可能是由同伴或椎间盘破裂后保持的。
Warped accretion discs of low viscosity are prone to hydrodynamic instability due to parametric resonance of inertial waves as confirmed by local simulations. Global simulations of warped discs, using either smoothed particle hydrodynamics (SPH) or grid-based codes, are ubiquitous but no such instability has been seen. Here we utilize a hybrid Godunov-type Lagrangian method to study parametric instability in global simulations of warped Keplerian discs at unprecedentedly high resolution (up to 120 million particles). In the global simulations, the propagation of the warp is well described by the linear bending-wave equations before the instability sets in. The ensuing turbulence, captured for the first time in a global simulation, damps relative orbital inclinations and leads to a decrease in the angular momentum deficit. As a result, the warp undergoes significant damping within one bending-wave crossing time. Observed protoplanetary disc warps are likely maintained by companions or aftermath of disc breaking.
