The numerical relativity code Nmesh

by Prof. Wolfgang Tichy

Wednesday 31 Jul 2024, 16:00 → 18:00 Europe/Berlin

Abbeanum/Ground floor-HS 2 - Hörsaal 2 (TPI, FSU Jena)

We give an introduction to the Nmesh code. It is intended to run efficiently on large supercomputers in order to solve challenging relativistic astrophysics problems such as binary neutron star or black hole mergers. To treat matter (e.g. neutron stars) we have implemented the Valencia
formulation of the evolution equations for general relativistic
hydrodynamics. These can be coupled to the evolution equations for gravity, for which we currently use the Generalized Harmonic system. The principal spatial discretization used in Nmesh is based on a discontinuous Galerkin method. However, we can also switch to finite difference or some form of finite volume methods, when needed in certain regions. We explain how we can use a smoothness indicator to decide which scheme to use. We also show first results of the evolution of neutron stars, for single star and binary star cases.