For smooth accretion discs in SPH, the default quadratic artificial viscosity beta = 2 adds too much numerical viscosity, and linking beta to the switched alpha (beta = 2 alpha) gives the least numerical spreading.
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Minimising the numerical viscosity in Smoothed Particle Hydrodynamics simulations of discs
For smooth accretion discs in SPH, the default quadratic artificial viscosity beta = 2 adds too much numerical viscosity, and linking beta to the switched alpha (beta = 2 alpha) gives the least numerical spreading.