Speaker
Description
The Dust Settling Instabilty (DSI) is a member of the Resonant Drag Instabilities (RDI) family, and is thus related to the
Streaming Instability (SI). Linear calculations found that the unstratified monodisperse DSI has growth rates much higher than the SI
even with lower initial dust to gas ratios. However, recent nonlinear investigation found no evidence of strong dust clumping at the
saturation level. We perform a suite of 2D shearing box hydrodynamic simulations with the code Idefix, both in the mono- and polydisperse
regimes. We focus on the time evolution of the maximum dust density, noting the time at which the instability is triggered, as well as
analyse the morphology of the resultant structure. We found that the monodisperse DSI produces dust structure at densities high enough that likely leads to clumping. The polydisperse
DSI produces lower but comparable dust densities at the same spatial resolution. Our idealised treatment suggests that the DSI is
important for planetesimal formation, as it suffers less than the SI from including a dust size distribution.
| Talk category | NOVA Network 2 |
|---|---|
| Preference for a talk or poster | Talk |
