[Users] -nan output.

Zach Etienne zachetie at gmail.com
Thu Aug 27 13:50:11 CDT 2020


Hi Bilal,

You are under-resolving the black holes. For stability you will
need gridspacing of at least ~1/16 around each black hole (M/16, where M=1
for this binary), and here your gridspacing is 1.25. I would suggest
starting by trying to reproduce the binary black hole gallery example:
https://einsteintoolkit.org/gallery/bbh/index.html

and adding small adjustments until you get it working according to your
needs.

-Zach

*     *     *
Prof. Zachariah Etienne
Physics & Astronomy Dept.
West Virginia University
http://astro.phys.wvu.edu/zetienne/
http://blackholesathome.net
<https://blackholesathome.net>


On Thu, Aug 27, 2020 at 2:38 PM Bilal Hameed <bilalhameedawan962 at gmail.com>
wrote:

> Dear Users.
>
> I am runing --parfile repos/ctthorns/CT_MultiLevel/par/twopunctures.par.
>
> ######################################
> # Flesh parameters
> ######################################
>
> Cactus::cctk_run_title = "Solving the Hamiltonian constraint for two
> punctures with CT_MultiLevel (multigrid setup, FMG) and with TwoPunctures"
>
> Cactus::cctk_full_warnings         = yes
> Cactus::highlight_warning_messages = no
> Cactus::cctk_timer_output          = "off"
>
> Cactus::terminate       = "any"
> Cactus::cctk_initial_time = 0
> Cactus::cctk_final_time = 30
> Cactus::cctk_itlast     = 200
>
>
>
> #############################################################################################
> ActiveThorns = "Boundary CartGrid3D CoordBase Slab SymBase"
>
> #############################################################################################
>
> CoordBase::domainsize = "minmax"
>
> CoordBase::xmin =  -40.00
> CoordBase::ymin =  -40.00
> CoordBase::zmin =  -40.00
> CoordBase::xmax =  +40.00
> CoordBase::ymax =  +40.00
> CoordBase::zmax =  +40.00
> CoordBase::dx   =  10
> CoordBase::dy   =  10
> CoordBase::dz   =  10
>
> CoordBase::boundary_size_x_lower     = 3
> CoordBase::boundary_size_y_lower     = 3
> CoordBase::boundary_size_z_lower     = 3
> CoordBase::boundary_size_x_upper     = 3
> CoordBase::boundary_size_y_upper     = 3
> CoordBase::boundary_size_z_upper     = 3
>
> CoordBase::boundary_shiftout_x_lower = 1
> CoordBase::boundary_shiftout_y_lower = 1
> CoordBase::boundary_shiftout_z_lower = 1
> CoordBase::boundary_shiftout_x_upper = 1
> CoordBase::boundary_shiftout_y_upper = 1
> CoordBase::boundary_shiftout_z_upper = 1
>
> CartGrid3D::type = "coordbase"
>
>
> ##################################################################################
> ActiveThorns = "IOUtil Carpet CarpetLib CarpetInterp LoopControl
> CarpetReduce CarpetSlab"
>
> ##################################################################################
>
> Carpet::adaptive_stepsize = "no"
>
> Carpet::schedule_barriers = no
> CarpetLib::output_bboxes  = no
> Carpet::init_fill_timelevels = "yes"
>
> Carpet::domain_from_coordbase = yes
> Carpet::max_refinement_levels = 5
>
> driver::ghost_size       = 3
> Carpet::use_buffer_zones = yes
>
> Carpet::prolongation_order_space = 5
> Carpet::prolongation_order_time  = 2
>
> Carpet::convergence_level = 0
>
> Carpet::poison_new_timelevels = yes
> CarpetLib::poison_new_memory  = yes
>
> Carpet::output_timers_every      = 0
> CarpetLib::print_timestats_every = 0
> CarpetLib::print_memstats_every  = 0
>
> CarpetLib::max_allowed_memory_MB = 12288
>
> ##################################################################
> ActiveThorns = "CarpetRegrid2"
> ##################################################################
>
> Carpet::grid_structure_filename = "grid_structure.asc"
> Carpet::grid_coordinates_filename = "grid_coordinates.asc"
>
> CarpetRegrid2::num_centres  = 1
> CarpetRegrid2::num_levels_1 = 4
> CarpetRegrid2::radius_1[1]  = 50
> CarpetRegrid2::radius_1[2]  = 25
> CarpetRegrid2::radius_1[3]  = 12
> #CarpetRegrid2::radius_1[4]  = 50
> #CarpetRegrid2::radius_1[5]  = 25
> #CarpetRegrid2::radius_1[6]  = 12
> #CarpetRegrid2::radius_1[7]  =  6
>
> #################################
> ActiveThorns = "AEILocalInterp"
> ActiveThorns = "BLAS LAPACK"
> ActiveThorns = "Fortran"
> ActiveThorns = "GenericFD"
> ActiveThorns = "HDF5"
> ActiveThorns = "InitBase"
> ActiveThorns = "LocalInterp"
> #################################
>
> #################################
> ActiveThorns = "MoL Time"
> #################################
>
> MoL::ODE_Method             = "RK4"
> MoL::MoL_Intermediate_Steps = 4
> MoL::MoL_Num_Scratch_Levels = 1
>
> Time::dtfac   = 0.2
>
>
> ###################################################################################################
> ActiveThorns = "CT_MultiLevel CT_Analytic ADMBase ML_BSSN ML_BSSN_Helper
> CoordGauge StaticConformal TmunuBase ADMCoupling ADMMacros TwoPunctures"
>
> ###################################################################################################
>
> ADMBase::metric_timelevels = 3
> ADMBase::lapse_timelevels = 3
> ADMBase::shift_timelevels = 3
>
> ADMBase::metric_type = "physical"
>
> ADMBase::initial_data    = "twopunctures"
> ADMBase::initial_lapse   = "twopunctures-averaged"
> ADMBase::initial_shift   = "zero"
> ADMBase::initial_dtlapse = "zero"
> ADMBase::initial_dtshift = "zero"
>
> ADMBase::evolution_method         = "ML_BSSN"
> ADMBase::lapse_evolution_method   = "ML_BSSN"
> ADMBase::shift_evolution_method   = "ML_BSSN"
> ADMBase::dtlapse_evolution_method = "ML_BSSN"
> ADMBase::dtshift_evolution_method = "ML_BSSN"
>
> ADMBase::admbase_boundary_condition = "none"
>
> TwoPunctures::par_b          =  1.168642873
> TwoPunctures::par_m_plus     =  0.453
> TwoPunctures::par_m_minus    =  0.453
> TwoPunctures::par_P_plus [1] = +0.3331917498
> TwoPunctures::par_P_minus[1] = -0.3331917498
>
> #TwoPunctures::grid_setup_method = "evaluation"
>
> TwoPunctures::TP_epsilon = 1.0e-2
> TwoPunctures::TP_Tiny    = 1.0e-2
>
> TwoPunctures::keep_u_around = "yes"
>
> CT_MultiLevel::cycle_type          = "FMG cycle"
> CT_MultiLevel::tol                 = 1e-12
> CT_MultiLevel::omega               = 1
> CT_MultiLevel::fd_order            = 4
> CT_MultiLevel::output_norms        = "yes"
> CT_MultiLevel::output_walk         = "yes"
> CT_MultiLevel::nrelsteps_down      = 700
> CT_MultiLevel::nrelsteps_up        = 650
> CT_MultiLevel::nrelsteps_bottom    = 700
> CT_MultiLevel::nrelsteps_top       = 650
> CT_MultiLevel::topMGlevel          = 4
> CT_MultiLevel::number_of_equations = 1
> CT_MultiLevel::number_of_auxiliaries = 1
> CT_MultiLevel::fill_ADM              = "yes"
> CT_MultiLevel::fill_Aij              = "Analytic Aij"
> CT_MultiLevel::boundary_conditions   = "TwoPunctures"
>
> CT_MultiLevel::compare_to_exact      = "yes"
> CT_MultiLevel::exact_solution_gfname[0] = "TwoPunctures::puncture_u"
> CT_MultiLevel::exact_offset             = -1.0
>
> CT_MultiLevel::inipsi_gfname[0]    = "CT_Analytic::testinipsi"
> CT_MultiLevel::cxx_gfname[0]       = "CT_Analytic::testcxx"
> CT_MultiLevel::cyy_gfname[0]       = "CT_Analytic::testcyy"
> CT_MultiLevel::czz_gfname[0]       = "CT_Analytic::testczz"
> CT_MultiLevel::n0[0]               = -7
> CT_MultiLevel::c0_gfname[0]        = "CT_MultiLevel::ct_auxiliary[0]"
> CT_MultiLevel::a0_gfname[0]        = "CT_Analytic::testa0"
>
> CT_MultiLevel::model               = "Bowen-York"
> CT_Analytic::free_data             = "Bowen-York"
> CT_Analytic::ampI                  = 1
> CT_Analytic::ampC                  = 1
> CT_Analytic::massa                 = 0.453
> CT_Analytic::massb                 = 0.453
> CT_Analytic::xa                    = 1.168642873
> CT_Analytic::xb                    = -1.168642873
> CT_Analytic::Pay                   = 0.3331917498
> CT_Analytic::Pby                   = -0.3331917498
>
> CT_Analytic::other_timelevels      = 3
>
> #################################
> ActiveThorns = "CarpetIOBasic"
> #################################
>
> IOBasic::outInfo_every      = 1
> IOBasic::outInfo_reductions = "norm2"
> IOBasic::outInfo_vars       = "
>     CT_MultiLevel::psi
>         Carpet::physical_time_per_hour
> "
>
> #################################
> ActiveThorns = "CarpetIOScalar"
> #################################
>
> IO::out_dir = $parfile
>
> IOScalar::one_file_per_group = yes
>
> IOScalar::outScalar_every = 0
> IOScalar::outScalar_vars  = "
> "
>
> #################################
> ActiveThorns = "CarpetIOASCII"
> #################################
>
> IOASCII::one_file_per_group = yes
>
> IOASCII::output_symmetry_points = yes
> IOASCII::out3D_ghosts           = yes
>
> IOASCII::out0D_criterion = "divisor"
> IOASCII::out0D_every = 0
> IOASCII::out0D_vars  = "
> "
>
> IOASCII::output_all_timelevels = "no"
> IOASCII::out1D_criterion = "divisor"
> IOASCII::out1D_every = 1
> IOASCII::out1D_vars  = "
>     CT_MultiLevel::psi
>     CT_MultiLevel::residual
>     CT_MultiLevel::err
>         ADMBase::metric
>         ADMBase::curv
>     ML_BSSN::ML_log_confac
>     ML_BSSN::ML_ham
>     TwoPunctures::puncture_u
> "
>
> IOASCII::out2D_every = 0
> IOASCII::out2D_criterion = "divisor"
> IOASCII::out2D_vars  = "
> "
>
> IOASCII::out3D_every = 0
> IOASCII::out3D_criterion = "divisor"
> IOASCII::out3D_vars  = "
>     CT_MultiLevel::psi
>     CT_MultiLevel::coeffs
> "
>
> #################################
> Activethorns = "CarpetIOHDF5"
> #################################
>
> IOHDF5::out_criterion = "divisor"
> IOHDF5::out_every          = 1
> IOHDF5::one_file_per_group = yes
> IOHDF5::compression_level  = 0
> IOHDF5::out_vars  = "
>     CT_MultiLevel::psi
>     CT_MultiLevel::err
>     CT_MultiLevel::residual
>     ML_BSSN::ML_log_confac
>     ML_BSSN::ML_ham
>     TwoPunctures::puncture_u
> "
>
> IOHDF5::checkpoint          = "no"
>
> #################################
> ActiveThorns = "Formaline"
> #################################
>
> #################################
> ActiveThorns = "TimerReport"
> #################################
>
> TimerReport::out_every    = 512
> TimerReport::out_filename = "TimerReport"
>
> *My ouput shows -nan after first itration. *
>
>    0     0.000 |    1.0013688 |    0.0000000
>         2     0.250 |         -nan | 1.128073e+03
>         4     0.500 |         -nan | 1.382569e+03
>         6     0.750 |         -nan | 1.318078e+03
>         8     1.000 |         -nan | 1.399377e+03
>        10     1.250 |         -nan | 1.336436e+03
>        12     1.500 |         -nan | 1.395822e+03
>        14     1.750 |         -nan | 1.364895e+03
>        16     2.000 |         -nan | 1.398991e+03
>        18     2.250 |         -nan | 1.359115e+03
>        20     2.500 |         -nan | 1.393235e+03
> I set refinement levels, radius, topMG. no error found in running.
>
> Kindly,
>
> _______________________________________________
> Users mailing list
> Users at einsteintoolkit.org
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>
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