Sample inits and Enzo parameter files

This page contains a large number of example inits and enzo parameter files that should cover any possible kind of Enzo cosmology simulation that you are interested in doing. All should run with minimal tinkering. They can be downloaded separately below, or as a single tarball.

Note: unless otherwise specified, inits is run by calling

  inits -d <name of inits parameter file>

and Enzo is run by calling

  [mpirun ...] enzo -d <name of enzo parameter file>

In both cases, the -d flag displays debugging information, and can be omitted. Leaving out the -d flag can significantly speed up Enzo calculations. Also note that enzo is an MPI-parallel program, whereas inits is not.

Unigrid dark matter-only cosmology simulation. This is the simplest possible Enzo cosmology simulation - a dark matter-only calculation (so no baryons at all) and no adaptive mesh. See the inits parameter file and enzo parameter file.

AMR dark matter-only cosmology simulation. This is a dark matter-only cosmology calculation (using the same initial conditions as the previous dm-only run) but with adaptive mesh refinement turned on. See the inits parameter file and enzo parameter file.

Unigrid hydro+dark matter cosmology simulation (adiabatic). This is a dark matter plus hydro cosmology calculation without adaptive mesh refinement and no additional physics. See the inits parameter file and enzo parameter file.

AMR hydro+dark matter cosmology simulation (adiabatic). This is a dark matter plus hydro cosmology calculation (using the same initial conditions as the previous dm+hydro run)with adaptive mesh refinement (refining everywhere in the simulation volume) and no additional physics. See the inits parameter file and enzo parameter file.

AMR hydro+dark matter cosmology simulation (lots of physics). This is a dark matter plus hydro cosmology calculation (using the same initial conditions as the previous two dm+hydro runs) with adaptive mesh refinement (refining everywhere in the simulation volume) and including radiative cooling, six species primordial chemistry, a uniform metagalactic radiation background, and prescriptions for star formation and feedback. See the inits parameter file and enzo parameter file.

AMR hydro+dark matter nested-grid cosmology simulation (lots of physics). This is a dark matter plus hydro cosmology calculation with two static nested grids providing excellent spatial and dark matter mass resolution for a single Local Group-sized halo and its progenitors. This simulation only refines in a small subvolume of the calculation, and includes radiative cooling, six species primordial chemistry, a uniform metagalactic radiation background, and prescriptions for star formation and feedback. All parameter files can be downloaded in one single tarball. Note that inits works differently for multi-grid setups. Instead of calling inits one time, it is called N times, where N is the number of grids. For this example, where there are three grids total (one root grid and two nested subgrids), the procedure would be:

  inits -d -s SubGridFile.inits  TopGridFile.inits
  inits -d -s SubSubGridFile.inits SubGridFile.inits 
  inits -d SubSubGridFile.inits 

this generates the root grid, first level grid, and finally second-level grid.