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OGS
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OGS
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<OpenGeoSysProject>
<meshes>
<mesh>bar.vtu</mesh>
<mesh>bar_left.vtu</mesh>
<mesh>bar_right.vtu</mesh>
</meshes>
<processes>
<process>
<name>PhaseField</name>
<type>PHASE_FIELD</type>
<coupling_scheme>staggered</coupling_scheme>
<integration_order>2</integration_order>
<phasefield_model>COHESIVE</phasefield_model>
<softening_curve>Exponential</softening_curve>
<energy_split_model>EffectiveStress</energy_split_model>
<irreversible_threshold>0.05</irreversible_threshold>
<characteristic_length>0.4</characteristic_length>
<constitutive_relation>
<type>LinearElasticIsotropic</type>
<youngs_modulus>E</youngs_modulus>
<poissons_ratio>nu</poissons_ratio>
</constitutive_relation>
<phasefield_parameters>
<residual_stiffness>k</residual_stiffness>
<crack_resistance>gc</crack_resistance>
<crack_length_scale>ls</crack_length_scale>
</phasefield_parameters>
<solid_density>rho_sr</solid_density>
<process_variables>
<phasefield>phasefield</phasefield>
<displacement>displacement</displacement>
</process_variables>
<secondary_variables>
<secondary_variable internal_name="sigma" output_name="sigma" type="static" />
<secondary_variable internal_name="epsilon" output_name="epsilon" type="static" />
</secondary_variables>
<specific_body_force>0 0 0</specific_body_force>
</process>
</processes>
<time_loop>
<global_process_coupling>
<max_iter>1000</max_iter>
<convergence_criteria>
<convergence_criterion>
<type>DeltaX</type>
<norm_type>INFINITY_N</norm_type>
<reltol>1.e-6</reltol>
</convergence_criterion>
<convergence_criterion>
<type>DeltaX</type>
<norm_type>INFINITY_N</norm_type>
<reltol>1.e-6</reltol>
</convergence_criterion>
</convergence_criteria>
</global_process_coupling>
<processes>
<process ref="PhaseField">
<nonlinear_solver>basic_newton_u</nonlinear_solver>
<convergence_criterion>
<type>DeltaX</type>
<norm_type>NORM2</norm_type>
<reltol>1.e-14</reltol>
</convergence_criterion>
<time_discretization>
<type>BackwardEuler</type>
</time_discretization>
<time_stepping>
<type>FixedTimeStepping</type>
<t_initial>0</t_initial>
<t_end>1.1</t_end>
<timesteps>
<pair>
<repeat>1</repeat>
<delta_t>1.e-1</delta_t>
</pair>
</timesteps>
</time_stepping>
</process>
<process ref="PhaseField">
<nonlinear_solver>petsc_snes</nonlinear_solver>
<convergence_criterion>
<type>DeltaX</type>
<norm_type>NORM2</norm_type>
<reltol>1.e-14</reltol>
</convergence_criterion>
<time_discretization>
<type>BackwardEuler</type>
</time_discretization>
<time_stepping>
<type>FixedTimeStepping</type>
<t_initial>0</t_initial>
<t_end>1.1</t_end>
<timesteps>
<pair>
<repeat>1</repeat>
<delta_t>1.e-1</delta_t>
</pair>
</timesteps>
</time_stepping>
</process>
</processes>
<output>
<variables>
<variable>displacement</variable>
<variable>phasefield</variable>
<variable>sigma</variable>
<variable>epsilon</variable>
</variables>
<type>VTK</type>
<prefix>bar_COHESIVE_exponential</prefix>
<timesteps>
<pair>
<repeat>1</repeat>
<each_steps>1</each_steps>
</pair>
<pair>
<repeat>1</repeat>
<each_steps>1</each_steps>
</pair>
</timesteps>
</output>
</time_loop>
<parameters>
<parameter>
<name>E</name>
<type>Constant</type>
<value>3e10</value>
</parameter>
<parameter>
<name>nu</name>
<type>Constant</type>
<value>0.2</value>
</parameter>
<parameter>
<name>k</name>
<type>Constant</type>
<value>1e-16</value>
</parameter>
<parameter>
<name>gc</name>
<type>Constant</type>
<value>120</value>
</parameter>
<parameter>
<name>ls</name>
<type>Constant</type>
<value>0.05</value>
</parameter>
<parameter>
<name>rho_sr</name>
<type>Constant</type>
<value>0.0</value>
</parameter>
<parameter>
<name>displacement0</name>
<type>Constant</type>
<values>0 0 0</values>
</parameter>
<parameter>
<name>phasefield_ic</name>
<type>Constant</type>
<value>1</value>
</parameter>
<parameter>
<name>phasefield_bc</name>
<type>Constant</type>
<value>1</value>
</parameter>
<parameter>
<name>dirichlet0</name>
<type>Constant</type>
<value>0</value>
</parameter>
<parameter>
<name>dirichlet_right</name>
<type>CurveScaled</type>
<curve>dirichlet_time</curve>
<parameter>dirichlet_load</parameter>
</parameter>
<parameter>
<name>dirichlet_load</name>
<type>Constant</type>
<value>1.1e-4</value>
</parameter>
</parameters>
<curves>
<curve>
<name>dirichlet_time</name>
<coords>0 1.0</coords>
<values>0 1.0</values>
</curve>
</curves>
<process_variables>
<process_variable>
<name>phasefield</name>
<components>1</components>
<order>1</order>
<initial_condition>phasefield_ic</initial_condition>
<boundary_conditions>
<boundary_condition>
<geometrical_set>bar</geometrical_set>
<geometry>left</geometry>
<type>Dirichlet</type>
<component>0</component>
<parameter>phasefield_bc</parameter>
</boundary_condition>
<boundary_condition>
<geometrical_set>bar</geometrical_set>
<geometry>right</geometry>
<type>Dirichlet</type>
<component>0</component>
<parameter>phasefield_bc</parameter>
</boundary_condition>
</boundary_conditions>
</process_variable>
<process_variable>
<name>displacement</name>
<components>3</components>
<order>1</order>
<initial_condition>displacement0</initial_condition>
<boundary_conditions>
<boundary_condition>
<geometrical_set>bar</geometrical_set>
<geometry>left</geometry>
<type>Dirichlet</type>
<component>0</component>
<parameter>dirichlet0</parameter>
</boundary_condition>
<boundary_condition>
<geometrical_set>bar</geometrical_set>
<geometry>right</geometry>
<type>Dirichlet</type>
<component>0</component>
<parameter>dirichlet_right</parameter>
</boundary_condition>
</boundary_conditions>
</process_variable>
</process_variables>
<nonlinear_solvers>
<nonlinear_solver>
<name>petsc_snes</name>
<type>PETScSNES</type>
<max_iter>50</max_iter>
<linear_solver>linear_solver_d</linear_solver>
</nonlinear_solver>
<nonlinear_solver>
<name>basic_newton_u</name>
<type>Newton</type>
<max_iter>200</max_iter>
<linear_solver>linear_solver_u</linear_solver>
</nonlinear_solver>
</nonlinear_solvers>
<linear_solvers>
<linear_solver>
<name>linear_solver_d</name>
<petsc>
<parameters>-ksp_type cg -pc_type bjacobi -ksp_atol 1e-10 -ksp_rtol 1e-10 -snes_type vinewtonrsls -snes_linesearch_type l2 -snes_atol 1.e-8 -snes_rtol 1.e-8 -snes_max_it 1000 -snes_monitor</parameters>
</petsc>
</linear_solver>
<linear_solver>
<name>linear_solver_u</name>
<petsc>
<prefix>u</prefix>
<parameters>-u_ksp_type cg -u_pc_type bjacobi -u_ksp_atol 1e-14 -u_ksp_rtol 1e-14</parameters>
</petsc>
</linear_solver>
</linear_solvers>
</OpenGeoSysProject>
1.12.0