galaxies.ini

! the name of the project, used for output filenames
project_name=galaxies
gravitational_constant=6.6738480e-11             ! 6.6738480e-11 N*(m/kg)² normally...
omp_threads=1
omp_split=1
random_seed=1
integrator=yo8
force_calculation=barnes_hut


! duration of the run, timestep and time format
timestep_mode=variable                           ! constant or variable
time_format=seconds                              ! seconds, hours, days, years
t_end=31536000000
dt_factor=0.01                                   ! dt_factor for variable timestep


! output parameters
dt_output=3153600000
output_exact_times=true
output_to_single_file=false                      
output_energy_conservation=true    
output_timesteps=true                            
output_silent_mode=false                          


! barnes-hut parameters
theta=0.5
!maxDepth=
!max_objects_per_external_node=1
!calc_in_com_frame=false                         ! do all calculations in the center of mass frame


! set up the objects
nr_of_inits=2                                    ! nr of init blocks

! big galaxy
init_1_src=system                                       ! create a random circle of objects with the data given here
init_1_center_x=0                                       ! center point x
init_1_center_y=0                                       ! center point y
init_1_center_object_mass=1e37                          ! center object mass
init_1_center_object_is_virtual=false                   ! a virtual center object is used for the velocity calculation, but no object is created
init_1_vel_x=0                                          ! bulk movement of the system
init_1_vel_y=0                                          ! bulk movement of the system
init_1_rotation=clockwise                               ! rotating direction: clockwise, anti-clockwise, both
init_1_radius=1e16                                      ! maximum distance to the center point
init_1_radius2=1e12                                     ! minimum distance to the center point
init_1_nr_of_objects=8000                               ! how many objects to create (including the center object)
init_1_min_mass=1e29                                    ! minimum mass
init_1_max_mass=1e32                                    ! maximum mass
init_1_vel_factor_min=0.95                              ! give the object a velocity between "circular-speed * this" as minimum...
init_1_vel_factor_max=1.05                              ! ... and "* this" as maximum


! small galaxy
init_2_src=system                                       ! create a random circle of objects with the data given here
init_2_center_x=0                                       ! center point x
init_2_center_y=2.5e16                                  ! center point y
init_2_center_object_mass=1e36                          ! center object mass
init_2_center_object_is_virtual=false                   ! a virtual center object is used for the velocity calculation, but no object is created
init_2_vel_x=-1.5e5                                     ! bulk movement of the system
init_2_vel_y=0                                          ! bulk movement of the system
init_2_rotation=clockwise                               ! rotating direction: clockwise, anti-clockwise, both
init_2_radius=6e15                                      ! maximum distance to the center point
init_2_radius2=1e11                                     ! minimum distance to the center point
init_2_nr_of_objects=3000                               ! how many objects to create (including the center object)
init_2_min_mass=1e28                                    ! minimum mass
init_2_max_mass=1e32                                    ! maximum mass
init_2_vel_factor_min=0.8                               ! give the object a velocity between "circular-speed * this" as minimum...
init_2_vel_factor_max=1.2                               ! ... and "* this" as maximum