AMUN is a code to perform numerical simulations in a fluid approximation on uniform or adaptive meshes with and without magnetic field. The goal in developing this code is to create a solid framework for simulations on uniform and adaptive meshes in the Cartesian, cylindrical, or spherical coordinate systems with a number of numerical methods which can be selectable in an easy manner. The code is completely written in Fortran 2003.

The following features are already implemented:

• hydrodynamic and magnetohydrodynamic set of equations,
• Cartesian coordinate system,
• uniform and adaptive mesh generation and update,
• 2nd and 3rd order time integration using Runge-Kutta methods,
• 2nd order TVD interpolation with number of limiters, 3rd order LimO3 interpolation, and 5th, 7th, and 9th order Monotonicity Preserving interpolations,
• Riemann solvers of Roe- and HLL-types (HLL, HLLC, and HLLD),
• periodic and open boundary conditions,
• incompressive turbulence driving by the Alvelius method,
• viscosity and resistivity source terms,
• data stored in the HDF5 format,
• MPI parallization,
• full GNU gfortran compatibility.