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This sets of parameters, contained in the namelist block &AMR_PARAMS, controls the AMR grid global properties. Parameters specifying the refinement strategy are described elsewhere, and the corresponding namelist block &REFINE_PARAMS is used only if levelmax>levelmin.

Variable name, syntax, default value	Fortran type	Description
`levelmin=1`	`integer`	Minimum level of refinement. This parameter sets the size of the coarse (or base) grid to `nx=2**levelmin`.
`levelmax=1`	`integer`	Maximum level of refinement. If `levelmax=levelmin`, the simulation will be executed on a standad Cartesian grid of linear size `nx=2**levelmin`
`ngridmax=1`	`integer`	Maximum number of grids (or octs) that can be allocated during the run within each MPI process.
`ngridtot=1`	`integer`	Maximum number of grids (or octs) that can be allocated during the run for the entire set of MPI processes. One has `ngridmax=ngridtot/ncpu`.
`npartmax=1`	`integer`	Maximum number of particles of all types that can be allocated during the run within each MPI process.
`nparttot=1`	`integer`	Maximum number of particles of all types that can be allocated during the run for the entire set of MPI processes. One has `npartmax=nparttot/ncpu`.
`nsinkmax=1`	`integer`	Maximum number of sink particles during the run. Sink particles are duplicated over all MPI processes.
`nexpand=1`	`integer`	Number of times the mesh expansion is applied to the refinement map (see mesh smoothing).
`boxlen=1.0`	`real`	Box size in user's units
`nlevel_collapse=3`	`integer`	Number of levels above `levelmin` to follow initial halos collapse with a constant comoving resolution (`cosmo=.true.` only)