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Refinement parameters

The block named &REFINE_PARAMS contains the parameters related to grid refinement.

Variable name	Fortran type	Default value	Description
`x_refine`	`real array`	0.0	Geometry-based strategy: center of the refined region at each level of the AMR grid.
`y_refine`	`real array`	0.0	Geometry-based strategy: center of the refined region at each level of the AMR grid.
`z_refine`	`real array`	0.0	Geometry-based strategy: center of the refined region at each level of the AMR grid.
`r_refine`	`real array`	1e10	Geometry-based strategy: radius of the refined region at each level.
`a_refine`	`real array`	1.0	Geometry-based strategy: ratio Y/X of the refined region at each level.
`b_refine`	`real array`	1.0	Geometry-based strategy: ratio Z/X of the refined region at each level.
`exp_refine`	`real array`	2.0	Geometry-based strategy: exponent of the norm.
`jeans_refine`	`real array`	-1.0	Jeans refinement strategy: each level is refined if the cell size exceeds the local Jeans length divided by jeans_refine(ilevel).
`mass_cut_refine`	`real`	-1.0	Mass threshold for particle-based refinement
`m_refine`	`real array`	-1.0	Quasi-Lagrangian strategy: each level is refined if the baryons mass in a cell exceeds `m_refine(ilevel)*mass_sph`, or if the number of dark matter particles exceeds `m_refine(ilevel)`, whatever the mass is.
`mass_sph`	`real`	0.0	Quasi-Lagrangian strategy: `mass_sph` is used to set a typical mass scale. For cosmo runs, its value is set automatically.
`err_grad_d`	`real`	-1.0	Discontinuity-based strategy: density gradient relative variations above which a cell is refined
`err_grad_u`	`real`	-1.0	Discontinuity-based strategy: velocity gradient relative variations above which a cell is refined
`err_grad_p`	`real`	-1.0	Discontinuity-based strategy: pressure gradient relative variations above which a cell is refined
`floor_d`	`real`	1e-10	Density floor below which gradients are ignored
`floor_u`	`real`	1e-10	Velocity floor below which gradients are ignored
`floor_p`	`real`	1e-10	Pressure floor below which gradients are ignored
`ivar_refine`	`int`	-1	Variable index for refinement
`var_cut_refine`	`real`	-1.0	Threshold for variable-based refinement
`interpol_var`	`int`	0	Variables used to perform interpolation (prolongation) and averaging (restriction). `interpol_type=0`: conservatives; `interpol_type=1`: primitives
`interpol_type`	`int`	1	Type of slope limiter used in the interpolation scheme for newly refined cells. `interpol_type=0`: Straight injection (1st order), `interpol_type=1`: MinMod limiter, `interpol_type=2`: MonCen limiter, `interpol_type=3`: unlimited central slope, `interpol_type=4`: type 3 for velocity and type 2 for density and internal energy (if `interpol_var=2`)
`sink_refine`	`bool`	`.false.`	Refines grid around sinks to levelmax