吸积盘中的各向异性流体动力学turbulence
Anisotropic hydrodynamic turbulence in accretion disks
摘要：
近年来，垂直切变不稳定性（VSI）已成为弱电离吸积盘所需的异常角动量输运的一个有吸引力的纯流体动力学候选者。在直接三维数值模拟的VSI湍流在磁盘中，观察到一个三角形的循环模式，这是相反的通常的粘性流动行为。在这里，我们调查这个功能是否可能被解释为各向异性的VSI湍流。使用三维流体动力学模拟，我们计算的湍流雷诺应力相关的角动量输运的一个代表性的部分磁盘。我们发现，垂直应力明显大于径向应力。使用我们的结果在粘性盘模拟与不同的粘性系数的径向和垂直方向，我们发现很好的协议与VSI湍流的应力和湍流，这提供了额外的证据的各向异性。结果是重要的，相对于小嵌入颗粒在磁盘中的运输。
英文摘要：
Recently, the vertical shear instability (VSI) has become an attractive purely hydrodynamic candidate for the anomalous angular momentum transport required for weakly ionized accretion disks. In direct three-dimensional numerical simulations of VSI turbulence in disks, a meridional circulation pattern was observed that is opposite to the usual viscous flow behavior. Here, we investigate whether this feature can possibly be explained by an anisotropy of the VSI turbulence. Using three-dimensional hydrodynamical simulations, we calculate the turbulent Reynolds stresses relevant for angular momentum transport for a representative section of a disk. We find that the vertical stress is significantly stronger than the radial stress. Using our results in viscous disk simulations with different viscosity coefficients for the radial and vertical direction, we find good agreement with the VSI turbulence for the stresses and meridional flow; this provides additional evidence for the anisotropy. The results are important with respect to the transport of small embedded particles in disks.
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