Rayleigh--Taylor Instabilty (Jupiter-like, equal mass, 3D) -------------- This is a 3D version of the Rayleigh--Taylor instability. These initial conditions are those used to produce the simulations presented by Sandnes et al. (2025b). This test uses particles of equal mass and has a sharp density. Equations of state and conditions are representative of those within Jupiter's interior. Note that the default resolution_eta parameter is consistent with the use of a Wendland C2 kernel with ~100 neighbours. Some examples of configuration options with different hydro schemes: REMIX: `--with-hydro=remix --with-equation-of-state=planetary --with-kernel=wendland-C2 --with-ext-potential=constant --enable-boundary-particles=22369` "Traditional" SPH (tSPH): `--with-hydro=planetary --with-equation-of-state=planetary --with-kernel=wendland-C2 --with-ext-potential=constant --enable-boundary-particles=22369`