VPH - A better method to simulate turbulent gas with a Lagrangian scheme

Lagrangian Voronoi particle hydrodynamics (VPH) is a new fluid particle method whose density estimate is carried out with the help of an auxiliary mesh constructed as the Voronoi tessellation. This approach is capable to represent sharp density gradients and therefore avoids spurious surface tension effects across contact discontinuities that arise in SPH simulations. This makes it ideal to study phenomena that involve steep density gradients. For instance for the interaction of galaxies with the intracluster medium we find that the more accurate treatment of hydrodynamic instabilities in VPH leads to a more turbulent wake in the cluster and a faster transfer of gas from the galaxy.