MetaData:
  run_name: stromgrenSphere-2D

# Define the system of units to use internally. 
InternalUnitSystem:
  UnitMass_in_cgs:     1.98841586e+33 # 1 M_Sol
  UnitLength_in_cgs:   3.08567758e21 # kpc in cm
  UnitVelocity_in_cgs: 1.e5 # km/s
  UnitCurrent_in_cgs:  1.
  UnitTemp_in_cgs:     1. # K

# Parameters governing the time integration
TimeIntegration:
  max_nr_rt_subcycles: 8
  time_begin: 0.    # The starting time of the simulation (in internal units).
  time_end:   0.512 
  dt_min:     1.e-12 # The minimal time-step size of the simulation (in internal units).
  dt_max:     1.e-03  # The maximal time-step size of the simulation (in internal units).

# Parameters governing the snapshots
Snapshots:
  basename:            output # Common part of the name of output files
  time_first:          0.     # Time of the first output (in internal units)
  delta_time:          0.001  # Time between snapshots

# Parameters governing the conserved quantities statistics
Statistics:
  time_first:          0.
  delta_time:          1e-3 # Time between statistics output

# Parameters for the hydrodynamics scheme
SPH:
  resolution_eta:        1.2348   # Target smoothing length in units of the mean inter-particle separation (1.2348 == 48Ngbs with the cubic spline kernel).
  CFL_condition:         0.8      # Courant-Friedrich-Levy condition for time integration.
  minimal_temperature:   10.      # Kelvin

# Parameters related to the initial conditions
InitialConditions:
  file_name:  ./stromgrenSphere-2D.hdf5     # The file to read
  periodic:   0                             # periodic ICs. Keep them periodic so we don't loose photon energy. 

Stars:
  resolution_eta:       2.2348        # (Optional) Target smoothing length in units of the mean inter-particle separation (1.2348 == 48Ngbs with the cubic spline kernel). Defaults to the SPH value.

GEARRT:
  f_reduce_c: 0.01                                  # reduce the speed of light for the RT solver by multiplying c with this factor
  CFL_condition: 0.9
  photon_groups_Hz: [3.288e15]                      # Lower photon frequency group bin edges in Hz. Needs to have exactly N elements, where N is the configured number of bins --with-RT=GEAR_N
  stellar_luminosity_model: const                   # Which model to use to determine the stellar luminosities.
  const_stellar_luminosities_LSol: [6.198024e+04]   # (Conditional) constant star luminosities for each photon frequency group to use if stellar_luminosity_model:const is set, in units of Solar Luminosity.
  hydrogen_mass_fraction:  1.00                     # total hydrogen (H + H+) mass fraction in the metal-free portion of the gas
  set_equilibrium_initial_ionization_mass_fractions: 0   # (Optional) set the initial ionization fractions depending on gas temperature assuming ionization equilibrium.
  set_initial_ionization_mass_fractions: 1          # (Optional) manually overwrite initial mass fraction of each species (using the values you set below)
  mass_fraction_HI: 0.999999                        # (Conditional) If overwrite_initial_ionization_fractions=1, needed to set initial HI mass fractions to this value
  mass_fraction_HII: 1.e-6                          # (Conditional) If overwrite_initial_ionization_fractions=1, needed to set initial HII mass fractions to this value
  mass_fraction_HeI: 0.                             # (Conditional) If overwrite_initial_ionization_fractions=1, needed to set initial HeI mass fractions to this value
  mass_fraction_HeII: 0.                            # (Conditional) If overwrite_initial_ionization_fractions=1, needed to set initial HeII mass fractions to this value
  mass_fraction_HeIII: 0.                           # (Conditional) If overwrite_initial_ionization_fractions=1, needed to set initial HeIII mass fractions to this value
  stellar_spectrum_type: 1                          # Which radiation spectrum to use. 0: constant from 0 until some max frequency set by stellar_spectrum_const_max_frequency_Hz. 1: blackbody spectrum.
  stellar_spectrum_blackbody_temperature_K: 1.e5    # (Conditional) if stellar_spectrum_type=1, use this temperature (in K) for the blackbody spectrum.
  stars_max_timestep: 1.6e-5                        # (Optional) restrict the maximal timestep of stars to this value (in internal units)
