allocate_age_model allocate_basal_yield_stress allocate_bed_deformation allocate_bedrock_thermal_unit allocate_couplers allocate_energy_model allocate_geometry_evolution allocate_iceberg_remover allocate_isochrones allocate_storage allocate_stressbalance allocate_subglacial_hydrology allocate_submodels basal_yield_stress_model bed_deformation_model bedrock_thermal_model bedrock_thermal_model_step bootstrap_2d calving cold_base_area combine_basal_melt_rate compute_geometry_change compute_lat_lon compute_original_ice_fraction compute_temperate_base_fraction ConsistencyFlag ctx define_diagnostics define_model_state dt dt_TempAge energy_balance_model energy_model_inputs energy_step enforce_consistency_of_geometry extras_max_timestep flush_timeseries forced_retreat front_retreat_step frontal_melt geometry geometry_evolution grid HistoryTreatment hydrology_step ice_volume_cold ice_volume_temperate IceModel identify_open_ocean init init_calving init_checkpoints init_diagnostics init_extras init_front_retreat init_frontal_melt init_snapshots init_timeseries initialize_2d list_diagnostics m_adaptive_timestep_reason m_age_model m_basal_melt_rate m_basal_yield_stress m_basal_yield_stress_model m_beddef m_bedtoptemp m_btu m_calving_rate_factor m_checkpoint_filename m_checkpoint_vars m_config m_ctx m_current_snapshot m_diagnostics m_dt m_eigen_calving m_energy_model m_extra_bounds m_extra_file m_extra_file_is_ready m_extra_filename m_extra_times m_extra_vars m_float_kill_calving m_fracture m_front_retreat m_frontal_melt m_geometry m_geometry_evolution m_grid m_hayhurst_calving m_ice_thickness_bc_mask m_iceberg_remover m_isochrones m_last_checkpoint_time m_last_extra m_log m_model_state m_n_work2d m_new_bed_elevation m_next_extra m_ocean m_output_global_attributes m_output_vars m_prescribed_retreat m_save_extra m_save_snapshots m_sea_level m_skip_countdown m_snapshot_times m_snapshot_vars m_snapshots_file_is_ready m_snapshots_filename m_split_extra m_split_snapshots m_start_time m_stdout_flags m_step_counter m_stress_balance m_subglacial_hydrology m_submodels m_surface m_surface_input_for_hydrology m_sys m_thickness_change m_thickness_threshold_calving m_time m_timestamp m_timestep_hit_multiples_last_time m_ts_diagnostics m_ts_filename m_ts_times m_ts_vars m_velocity_bc_mask m_velocity_bc_values m_viewers m_vonmises_calving m_wide_stencil m_work2d m_work2d_proc0 MappingTreatment max_timestep max_timestep_diffusivity misc_setup model_state_setup ocean_model output_variables OutputKind post_step_hook pre_step_hook prepend_history print_summary print_summary_line process_options process_signals prune_diagnostics regrid reset_counters reset_diagnostics restart_2d run run_stats run_to save_max_timestep save_results save_state_on_error save_variables set_python_ocean_model skip_counter step stress_balance stress_balance_inputs t_TempAge temperate_base_area time_setup ts_max_timestep update_diagnostics update_fracture_density update_viewers view_field write_checkpoint write_diagnostics write_extras write_metadata write_model_state write_snapshot yield_stress_inputs ~IceModel

max_timestep_diffusivity() MaxTimestep pism::IceModel::max_timestep_diffusivity ( ) protectedvirtual Compute the maximum time step allowed by the diffusive SIA. If maximum diffusivity is positive (i.e. if there is diffusion going on) then updates dt. Note adapt_ratio * 2 is multiplied by dx^2/(2*maxD) so dt <= adapt_ratio * dx^2/maxD (if dx=dy). Reference: [MortonMayers] pp 62–63. Definition at line 50 of file timestepping.cc. References m_config, m_grid, m_stress_balance, pism::max_timestep_diffusivity(), and pism::array::min(). Referenced by max_timestep().