WHAT IS NIRVANA? NIRVANA is a C code for astrophysical fluid flow modeling. It numerically integrates the 2D/3D equations of time-dependent, non-relativistic, compressible magnetohydrodynamics on Cartesian/cylindrical/spherical grids. NIRVANA provides adaptive mesh refinement techniques to handle multi-scale problems and implements a Poisson solver to treat self-gravitational flows... CODE VERSION: 3.5.2 PHYSICS: Newtonian hydrodynamics/magnetohydrodynamics standard viscosity, magnetic diffusion, thermal conduction anisotropic (magnetic-field-dependent) Spitzer conductivity model including saturation effects different gas equation of states (isothermal, adiabatic, polytropic, user-defined) ISM cooling/heating function passive tracer external force rotating frame selfgravity NUMERICS: 2nd-order FV approach central-upwind or HLLD-based flux computation constrained-transport scheme for induction equation 2nd/3rd-order Runge-Kutta time integrators 2nd-order FD approach for dissipative fluxes MLAT-type multigrid Poisson solver dual energy formalism look-up table scheme based on cubic interpolation techniques backward Euler + Pegasus root finder for ISM heatloss term GEOMETRIES: Cartesian cylindrical spherical ADAPTIVE MESH REFINEMENT: block-structured approach conservative & divergence-free infrastructure refinement criteria: gradients/2nd-derivatives, Jeans-length, Field-length PARALLELIZATION: MPI library coarse-grained communication model load balancer based on space-filling curve mesh partitioning EQUATIONS TABLE_OF_FUNCTIONALITY USERS GUIDE ADDONS (old)