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Minimising the numerical viscosity in Smoothed Particle Hydrodynamics simulations of discs
Cheng Chen, C. J. Nixon
https://arxiv.org/abs/2505.24343 https:/…

Minimising the numerical viscosity in Smoothed Particle Hydrodynamics simulations of discs
Simulations using the Smoothed Particle Hydrodynamics (SPH) technique typically include numerical viscosity to model shocks and maintain particle order on the kernel scale. This numerical viscosity is composed of linear and quadratic terms, with coefficients $α_{\rm SPH}$ and $β_{\rm SPH}$ respectively. Setting these coefficients too high results in excessive numerical dissipation, whereas setting them too low may lead to unwanted effects such as particle penetration, which also leads to exce…