A smoothed particle hydrodynamics algorithm for multigrain dust with separate sets of particles

Daniel Mentiplay , Daniel J. Price , Christophe Pinte (1) , Guillaume Laibe (2)

1 IPAG - Institut de Planétologie et d'Astrophysique de Grenoble
2 CRAL - Centre de Recherche Astrophysique de Lyon

We present a method for simulating the dynamics of a mixture of gas and multiple species of large Stokes number dust grains, typical of evolved protoplanetary discs and debris discs. The method improves upon earlier methods, in which only a single grain size could be represented, by capturing the differential backreaction of multiple dust species on the gas. This effect is greater for large dust-to-gas ratios that may be expected in the later stages of the protoplanetary disc life. We benchmark the method against analytic solutions for linear waves, drag, and shocks in dust-gas mixtures, and radial drift in a protoplanetary disc showing that the method is robust and accurate.

Mots clés: hydrodynamics; methods: numerical; protoplanetary discs; Astrophysics - Earth and Planetary Astrophysics; Astrophysics - Instrumentation and Methods for Astrophysics

Domaines: Planète et Univers [physics]

Daniel Mentiplay, Daniel J. Price, Christophe Pinte, Guillaume Laibe. A smoothed particle hydrodynamics algorithm for multigrain dust with separate sets of particles. Monthly Notices of the Royal Astronomical Society, 2020, 499, pp.3806-3818. ⟨10.1093/mnras/staa3171⟩. ⟨insu-03705163⟩