CAFE-R: A Code That Solves the Special Relativistic Radiation Hydrodynamics Equations

Abstract

We present a 3D special relativistic radiation hydrodynamics code. It uses the radiative inversion scheme with the M1 closure relation for the radiation equations, which allows the treatment of a wide range of optical depth, temperature, and opacity. The radiation field is treated in the graybody approximation. We present the standard 1D and 2D tests that include both optically thin and thick scenarios, as well as hydrodynamical and radiation-pressure-dominated configurations. As an application in 3D, we show the evolution of a jet driven by radiation hydrodynamics with a helical perturbation. The code is expected to allow the exploration of scenarios in high-energy astrophysics where the radiation is important, like sources of gamma-ray bursts.