The AREPO code is based on a moving unstructured mesh defined by the Voronoi tessellation of a set of discrete points . The mesh is used to solve the hyperbolic conservation laws of ideal hydrodynamics with a finite volume approach, based on a second-order unsplit Godunov scheme with an exact Riemann solver.
This method is fully Galilean-invariant, unlike ordinary Eulerian codes, a property that is of significant importance for cosmological simulations where highly supersonic bulk flows are common. In addition, it can adjust its spatial resolution automatically and continuously, and hence inherits the principal advantage of SPH for simulations of cosmological structure growth.
The initial paper for “The AREPO code” has been published as Springel 2010. For more information and relevant publications please visit HITS’s project description page or contact Volker Springel.