Global three-dimensional simulations of outer protoplanetary discs with ambipolar diffusion

The structure and evolution of protoplanetary disks (PPDs) are largely governed by disk angular momentum transport, mediated magnetic fields. In the most observable outer disk, PPD gas dynamics is primarily controlled ambipolar diffusion as dominant non-ideal magnetohydrodynamic (MHD) effect. this work, we study in PPDs conducting a set global 3D MHD simulations with net poloidal flux, using Athena++ code, resolution comparable to local simulations. Our demonstrate co-existence magnetized wind turbulence driven magneto-rotational instability (MRI). While dominates MRI also contributes significantly. We observe that flux spontaneously concentrate into axisymmetric sheets, leading radial variations levels, stresses, accretion rates. Annular substructures arise natural consequence concentration. concentration phenomena show diverse properties different levels magnetization diffusion. generally loses over time, though sheets could prevent leak some cases. results ubiquity annular weakly turbulent PPDs, imply stochastic nature evolution.