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 <[email protected]> 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 > [email protected] > http://lists.einsteintoolkit.org/mailman/listinfo/users >
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