|Time:||Thursday, May 30, 2019, 10:30am|
|Title:||Global simulation of the vertical shear instability with non-ideal MHD effects (informal talk)|
|Speaker:||MS. Can Cui (SHAO)|
Understanding mechanisms of angular momentum transport is crucial for the gas dynamics hence the planet formation of protoplanetary disks (PPDs). In the recent years, it has been realized that the magneto-rotational instability (MRI) tends to be suppressed in PPDs due to non-ideal MHD effects, with wind-driven accretion and disk being largely laminar. In parallel, several hydrodynamic mechanisms have been identified that likely also drive disk accretion. We study the interplay between MHD winds in PPDs with the vertical shear instability (VSI), one of the most promising hydrodynamic mechanisms, through 2D global non-ideal MHD simulations. We find that for typical disk parameters, MHD winds can coexist with the VSI, with accretion primarily wind-driven, accompanied by vigorous VSI turbulence. Stronger magnetization leads to slower growth of the VSI. The evolution of turbulence, flow structure in the disk, and the time variability of the winds under the influence of the VSI will also be discussed.
Host: Prof. Xuening Bai