Anisotropic hydrodynamic turbulence in accretion disks
arXiv:1702.00334 · doi:10.1051/0004-6361/201630226
Abstract
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.
v2: minor corrections: language and equations
References in corpus (4)
Cited by in corpus (20)
- Gas and dust dynamics in starlight-heated protoplanetary disks
- Dust settling against hydrodynamic turbulence in protoplanetary discs
- High Resolution Parameter Study of the Vertical Shear Instability
- Radiation pressure clear-out of dusty photoevaporating discs
- Polydisperse Streaming Instability III. Dust evolution encourages fast instability
- Constraining Protoplanetary Disk Accretion and Young Planets Using ALMA Kinematic Observations
- The vertical shear instability in poorly ionised, magnetized protoplanetary discs
- Impact of Local Pressure Enhancements on Dust Concentration inTurbulent Protoplanetary Discs
- Vertical evolution of exocometary gas: I. How vertical diffusion shortens the CO lifetime
- No self-shadowing instability in 2D radiation-hydrodynamical models of irradiated protoplanetary disks
- Carbon Depletion in the Early Solar System
- Vertical settling of pebbles in turbulent circumbinary discs and the in situ formation of circumbinary planets
- Planet-disc interaction in laminar and turbulent discs
- Global Modeling of Nebulae With Particle Growth, Drift, and Evaporation Fronts. II. The Influence of Porosity on Solids Evolution
- Dust Transport in Protoplanetary Disks with Wind-driven Accretion
- Formation of the First Planetesimals via the Streaming Instability in Globally Turbulent Protoplanetary Disks?
- UV-processing of icy pebbles in the outer parts of VSI-turbulent disks
- A high resolution simulation of protoplanetary disk turbulence driven by the vertical shear instability
- Observability of the Vertical Shear Instability in protoplanetary disk CO kinematics
- Effects of turbulent diffusion and back-reaction on the dust distribution around two resonant planets