A Switch to Reduce SPH Viscosity

✍ Scribed by J.P. Morris; J.J. Monaghan

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 483 KB
• Volume: 136
• Category: Article
• ISSN: 0021-9991
• DOI: 10.1006/jcph.1997.5690

✦ Synopsis

turn the viscosity on when particles are approaching which removes the viscosity for rarefactions. This simple limiter Smoothed particle hydrodynamics is a Lagrangian particle method for fluid dynamics which simulates shocks by using an can often be used, but if the fluid has a natural boundary, artificial viscosity. Unlike Eulerian methods it is not convenient to as is the case in couette flow or an astrophysical accretion reduce the effects of viscosity by means of switches based on spatial disk, it gives an artificial edge pressure. Other limiters gradients. In this paper we introduce the idea of time-varying coeffiinclude using the ratio of the divergence and the curl of cients which fits more naturally with a particle formulation. Each the velocity field [1] to reduce the viscosity when the magniparticle has a viscosity parameter which evolves according to a simple source and decay equation. The source causes the parameter tude of the vorticity is much greater than that of the diverto grow when the particle enters a shock and the decay term causes gence.