# This parameter file sets up Kerr/Kerr-Schild initial data, then
# finds the apparent horizon in it.  The local coordinate system origin
# and the initial guess are both deliberately de-centered with respect
# to the black hole, to make this a non-trivial test for the apparent
# horizon finder.

# flesh
cactus::cctk_itlast = 0

########################################

#
# ***** output setup (also see below for more output stuff) *****
#
ActiveThorns = "IOUtil IOBasic"
IOUtil::parfile_write = "no"
IO::out_dir = $parfile

########################################

#
# basic grid setup
#

ActiveThorns = "Carpet CarpetLib CarpetInterp CarpetReduce"
Carpet::domain_from_coordbase    = true

ActiveThorns = "SymBase Boundary"
ActiveThorns = "CoordBase"
CoordBase::domainsize = "spacing"
CoordBase::zero_origin_x = true
CoordBase::zero_origin_y = true
CoordBase::zero_origin_z = true
CoordBase::dx   = 0.04
CoordBase::dy   = 0.04
CoordBase::dz   = 0.04
CoordBase::ncells_x = 80
CoordBase::ncells_y = 80
CoordBase::ncells_z = 80

#
# ghost zones
#

driver::ghost_size_x = 2
driver::ghost_size_y = 2
driver::ghost_size_z = 2

# ghost zones are outside the nominal grid
CoordBase::boundary_internal_x_lower = false
CoordBase::boundary_internal_x_upper = false
CoordBase::boundary_internal_y_lower = false
CoordBase::boundary_internal_y_upper = false
CoordBase::boundary_internal_z_lower = false
CoordBase::boundary_internal_z_upper = false

# ghost zone widths
CoordBase::boundary_size_x_lower     = 2
CoordBase::boundary_size_x_upper     = 2
CoordBase::boundary_size_y_lower     = 2
CoordBase::boundary_size_y_upper     = 2
CoordBase::boundary_size_z_lower     = 2
CoordBase::boundary_size_z_upper     = 2

# ghost zones start 0.5 point outside nominal grid boundary
CoordBase::boundary_shiftout_x_lower = 0
CoordBase::boundary_shiftout_x_upper = 0
CoordBase::boundary_shiftout_y_lower = 0
CoordBase::boundary_shiftout_y_upper = 0
CoordBase::boundary_shiftout_z_lower = 0
CoordBase::boundary_shiftout_z_upper = 0

# staggered grids everywhere
CoordBase::boundary_staggered_x_lower = true
CoordBase::boundary_staggered_x_upper = true
CoordBase::boundary_staggered_y_lower = true
CoordBase::boundary_staggered_y_upper = true
CoordBase::boundary_staggered_z_lower = true
CoordBase::boundary_staggered_z_upper = true

# octant symmetry
ActiveThorns = "ReflectionSymmetry"
ReflectionSymmetry::avoid_origin_x = true
ReflectionSymmetry::avoid_origin_y = true
ReflectionSymmetry::avoid_origin_z = true
ReflectionSymmetry::reflection_x = true
ReflectionSymmetry::reflection_y = true
ReflectionSymmetry::reflection_z = true

ActiveThorns = "CartGrid3D"
CartGrid3D::type = "CoordBase"

########################################

#
# Kerr initial data
#
ActiveThorns = "ADMBase ADMCoupling StaticConformal CoordGauge SpaceMask Exact"
ADMBase::initial_lapse = "exact"
ADMBase::initial_shift = "exact"
ADMBase::initial_data = "exact"
ADMBase::lapse_evolution_method = "static"
ADMBase::shift_evolution_method = "static"
ADMBase::metric_type = "physical"
Exact::exact_model = "Kerr/Kerr-Schild"
Exact::Kerr_KerrSchild__mass = 1.0
Exact::Kerr_KerrSchild__spin = 0.6

########################################

ActiveThorns = "SphericalSurface"
ActiveThorns = "AEILocalInterp AHFinderDirect"

AHFinderDirect::print_timing_stats = "true"

AHFinderDirect::output_Theta_every = 1
AHFinderDirect::h_base_file_name     = "Kerr.h"
AHFinderDirect::Theta_base_file_name = "Kerr.Theta"

AHFinderDirect::N_horizons = 1
AHFinderDirect::patch_system_type[1] = "+z hemisphere"
AHFinderDirect::origin_x[1] = 0.5
AHFinderDirect::origin_y[1] = 0.7
AHFinderDirect::origin_z[1] = 0.0

AHFinderDirect::initial_guess_method[1] = "coordinate sphere"
AHFinderDirect::initial_guess__coord_sphere__x_center[1] = -0.2
AHFinderDirect::initial_guess__coord_sphere__y_center[1] =  0.3
AHFinderDirect::initial_guess__coord_sphere__z_center[1] =  0.0
AHFinderDirect::initial_guess__coord_sphere__radius[1] = 2.0