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The vertical shear instability (VSI) is a robust phenomenon in irradiatedprotoplanetary disks (PPDs). The majority of previous numerical simulationshave focused on the turbulent properties of its saturated state. However, thesaturation of the VSI manifests as large-scale coherent radially travellinginertial waves. In this paper, we study inertial-wave-disk interactions andtheir impact on VSI saturation. Inertial-wave linear theory is developed andapplied to a representative global 2D simulation using the Athena++ code. It isfound that the VSI saturates by separating the disk into several radial wavezones roughly demarcated by corotation resonances (turning points); thisstructure also manifests in modest radial variations in the vertical turbulencestrength. Future numerical work should employ large radial domains toaccommodate this radial structure of the VSI, while concurrently adoptingsufficiently fine resolutions to resolve the parametric instability thatattacks the saturated VSI inertial waves.

Wavelike nature of the vertical shear instability in global protoplanetary disks