Planetary Hydro Scheme
This scheme is based on Minimal (Density-Energy) SPH but also allows multiple materials,
meaning that different SPH particles can be assigned different
equations of state (EoS).
Every SPH particle then requires and carries the additional
from the initial conditions file. This flag indicates the particle’s material
and which EoS it should use.
The Balsara viscosity switch is used by default, but can be disabled by
compiling SWIFT with
Note: the boundary-improvement methods presented in Ruiz-Bonilla+2022 are in the process of being improved for release with better documentation etc soon.