Investigating prescriptions for artificial resistivity in smoothed particle magnetohydrodynamics
arXiv:1706.07721
Abstract
In numerical simulations, artificial terms are applied to the evolution equations for stability. To prove their validity, these terms are thoroughly tested in test problems where the results are well known. However, they are seldom tested in production-quality simulations at high resolution where they interact with a plethora of physical and numerical algorithms. We test three artificial resistivities in both the Orszag-Tang vortex and in a star formation simulation. From the Orszag-Tang vortex, the Price et. al. (2017) artificial resistivity is the least dissipative thus captures the density and magnetic features; in the star formation algorithm, each artificial resistivity algorithm interacts differently with the sink particle to produce various results, including gas bubbles, dense discs, and migrating sink particles. The star formation simulations suggest that it is important to rely upon physical resistivity rather than artificial resistivity for convergence.
arXiv comment8 pages, 7 figures. Proceedings of the "12th international SPHERIC workshop", Ourense, Spain, 13-15 June 2017
References in corpus (17)
- Modelling Accretion in Protobinary Systems
- Cosmological SPH simulations: The entropy equation
- SPLASH: An interactive visualisation tool for Smoothed Particle Hydrodynamics simulations
- Smoothed Particle Hydrodynamics and Magnetohydrodynamics
- Modelling discontinuities and Kelvin-Helmholtz instabilities in SPH
- Inviscid SPH
- Effect of Magnetic Braking on the Circumstellar Disk Formation in a Strongly Magnetized Cloud
- Can non-ideal magnetohydrodynamics solve the magnetic braking catastrophe?
- Protostellar collapse: radiative and magnetic feedbacks on small scale fragmentation
- Effects of Ohmic and ambipolar diffusion on the formation and evolution of the first cores, protostars and circumstellar discs
- Bridging the gap: disk formation in the Class 0 phase with ambipolar diffusion and Ohmic dissipation
- Smoothed Particle Magnetohydrodynamics I. Algorithms and tests in one dimension
- Constrained Hyperbolic Divergence Cleaning for Smoothed Particle Magnetohydrodynamics
- Protostellar Accretion Flows Destabilized by Magnetic Flux Redistribution
- A switch to reduce resistivity in smoothed particle magnetohydrodynamics
- The impact of non-ideal magnetohydrodynamics on binary star formation
- Radiation Magnetohydrodynamic Simulations of Protostellar Collapse: Low-Metallicity Environments
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- On the origin of magnetic fields in stars II: The effect of numerical resolution
- Resolving numerical star formation: A cautionary tale