The current status of the Nmesh code

We give an introduction to the new Nmesh code, which is intended to efficiently run on large supercomputers. The aim of Nmesh is to solve challenging relativistic astrophysics problems such as binary neutron star or black hole mergers. The principal spatial discretization used in Nmesh is based on a discontinuous Galerkin (DG) method. However, we can also switch to finite difference (FD) or finite volume (FV) methods when needed in certain regions. To treat matter (e.g. neutron stars) we have implemented the evolution equations for general relativistic hydrodynamics. These can be coupled to the evolution equations for gravity. We are currently investigating three different gravity evolution systems, the generalized harmonic system, a first order version of the Z4 system, as well as a new system that we intend to use to evolve black holes using the moving puncture formalism. We will describe the current capabilities of our code and show some examples.